最新刊期
卷 41 ， 期 2 ， 2021
- 摘要：<正>时间:2021年8月初地点:待定1.会议主办单位中国机械工程学会铸造分会《特种铸造及有色合金》杂志社2.会议承办单位《特种铸造及有色合金》杂志社3.会议时间2021年8月4.会议地点待定5.征文内容（1）铸造有色合金（包括铝、镁、钛等轻有色合金,铜、锌等重有色合金,中间合金,高温合金及特种合金）、复合材料（包括铝、镁、钛、铜、锌、钢等基体）的研究与应用;（2）铸造有色合金的熔炼、净化技术,凝固行为及组织和性能;
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发布时间：2023-12-18 - 摘要：The high quality integral forming of large-scale structural parts is a difficult problem in the field of parts manufacturing.Squeeze casting becomes a new choice for high-quality integral forming and manufacturing of large structural parts,which can successfully solve the problems of low feeding efficiency and shrinkage defects in traditional gravity casting by integral rheological feeding,and dramatically breaks through the limitation of equipment capacity in traditional forging technology by virtue of the good rheological filling capacity of molten metals.It has been proved that by using special coating and casting die instead of forging module and adjusting the die temperature effectively,they are efficient paths to reduce the cost proportion of die.Moreover,a series of new technologies,such as the local multi-point pressing,compound pressing and flowing semi-solid squeeze casting,are introduced to significantly reduce equipment investment and ensure high-quality forming.关键词：Large Scale Structural Parts;Liquid Forging;Squeeze Casting;Process Equipment
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发布时间：2023-12-18 - 摘要：The microstructure and mechanical behavior of ZM5 alloy with different conditions were carried out by microstructural analysis and tensile testing.The results reveal that there exist many coarse blocky β-Mg17Al12 phase in as-cast ZM5 alloy,which is distributed in form of netlike on the grain boundary.After solution treatment,the β-Mg17Al12 phase is dissolved intoα-Mg matrix,and a few Al-Mn phase remains.The lamellar β-Mg17Al12 phase is precipitated along the grain boundary in ZM5 alloy after T6 treatment.After two stage aging treatment,the lamellar β-Mg17Al12 phase is precipitated along the grain boundary and fine acicular β-Mg17Al12 phase is precipitated inside grain.Compared to that of as-cast ZM5 alloy,the ultimate tensile strength of heat treated ZM5 alloy is enhanced greatly.The ultimate tensile strength of ZM5 alloy treated by two stage aging can reach 285 MPa,which is 20 MPa higher than that of ZM5 alloy treated by T6.关键词：Magnesium Alloy;Heat Treatment;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：TiAl alloy is the current hot-spot material of lightweight high-temperature structure in aerospace engineering,of which the final microstructure is largely determined by its cooling process.Due to the complexity of the phase diagram and phase transition of TiAl alloys,it has become an important issue to obtain a fine-grained structure by controlling the cooling process for engineering research.The results of cooling transformation of TiAl alloy were reviewed,and the progress in Ti-48Al-4 Nb-2Cr alloy was presented including expounding the solidification path and phase transformation behavior of TiAl alloy firstly,then the continuous cooling transformation（CCT）and isothermal cooling transformation（TTT）behaviors.Furthermore,a CCT diagram of Ti-48Al-4Nb-2Cr alloy was established and a fine-grained NL（FGNL）microstructure was obtained.关键词：TiAl Alloy;Cooling Phase Transformation;CCT;TTT;Fine-grained Microstructure
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发布时间：2023-12-18 - 摘要：<正>国家增材制造创新中心、西安交通大学卢秉恒院士团队利用3D打印技术制成了10 m级高强铝合金重型运载火箭连接环样件。该样件利用电弧熔丝增减材一体化制造技术,在整体制造的工艺稳定性、精度控制及变形与应力调控等方面均实现重大技术突破。据了解,10m级超大型铝合金环件是连接重型运载火箭贮箱的筒段、前后底与火箭的箱间段之间的关键结构件。
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发布时间：2023-12-18 - 摘要：<正>云海金属日前表示,公司在新能源产品方面主要是提供方向盘、仪表盘支架、座椅支架、下摆臂、防撞梁等部件的设计和推广应用,另外也提供新能源汽车电池的部件。公司目前给宁德时代提供电池端板、散热口琴管等产品,还在开发电池托盘等产品。
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发布时间：2023-12-18 - 摘要：<正>日前,中国首套应用于航空航天等高端领域的大直径铝锂合金棒材及管材（锻件）,在河北宏润核装备科技股份有限公司挤压完成并成功下线。铝锂合金作为第三代铝基材料,相对于第一、二代铝基材料,质量减轻,强度及弹性模量显著提升,将逐步替代我国一代铝镁合金和二代铝铜合金。此前,铝锂合金大型锻件只有美国和俄罗斯具备较为成熟的生产制造能力,该铝锂合金材料的成功挤压,为中国铝锂合金行业发展及轻量化产业发展奠定了基础。
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发布时间：2023-12-18 - 摘要：<正>国家统计局公布数据显示,2020年中国铝产量为3 708万t,创下年度最高纪录,因铝厂利用铝价飙升获利。尽管12月价格涨势降温,但产量亦创下月度纪录高位。数据显示,2020年12月原铝产量为327万t,较11月的318.2万t增加2.8%,亦打破了10月份320万t的月度纪录。作为铝生产国,中国2020年产量超过2018年创下的3 580.2万t的纪录高位。2019年产量为10年来的首次下降。
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发布时间：2023-12-18 - 摘要：<正>从中科院金属研究所获悉,该所研制的钛铝合金的发动机叶片将首次应用于C919大飞机的配套发动机CJ1000,也就是大家所熟悉的长江1000发动机,替代了此前C919使用的美国通用电气和法国赛峰合资成立的CFM研发的LEAP-X1C发动机,打破了依赖进口的局面。
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发布时间：2023-12-18 - 摘要：<正>近日,国际骨科临床转化期刊《Journal of Orthopaedic Translation》在线发表了由上海交大戴尅戎院士、郝永强教授团队和丁文江院士、袁广银教授团队合作发表的可降解镁合金骨钉1～2年的临床试验观察结果,所有患者术后内踝骨折愈合,功能恢复。研究证实了可降解镁合金螺钉治疗内踝骨折的临床疗效及其生物安全性,为全降解镁合金植入物等高端医疗器械进一步的临床推广应用奠定了坚实基础,相关成果以"Effectiveness and safety of biodegradable Mg-Nd-Zn-Zr alloy screws for the treatment of medial malleolar fractures"为题在线发表于《Journal of Orthopaedic Translation》上。这是国内首个可降解医用镁合金临床试验的公开报道,也是国际首款含有功能涂层的可降解镁合金骨钉的临床试验结果的公开报道。
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发布时间：2023-12-18 - 摘要：<正>国家统计局公布数据显示,2020年12月,中国工业机器人销售29 706（套）,同比增长32.4%;1～12月,中国工业机器人销售237 068（套）,同比增长19.1%。装备制造业增势稳健,持续发挥重要支撑作用。2020年,装备制造业增加值比上年增长6.6%,增速与2019年基本持平。从主要行业看,2020年,电子、电气机械、汽车行业增长较快。分产品看,挖掘机、太阳能电池、笔记本电脑、工业机器人、新能源汽车、集成电路等主要产品实现较快增长。
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发布时间：2023-12-18 - 摘要：<正>体育器材的资源包含了体育竞技比赛和普通健身器械,运动的过程中体育器材能够与体育运动互相配合,促进体育运动的进行或者对体育运动进行辅助。本文中所举例的体育器材指的是普通健身器材。体育运动在发展的过程中器材的规格和种类也在不断发生变化,随着我国铸造工艺的提升和发展,体育器材的发展逐渐稳定。我国提出全民健身的倡议后,体育器材资源被大量地投放到学校以及社区等公共区域当中,但在指导方面缺乏专业人士,体育器材的资源消耗较大,造成了不必要的资源和经济浪费。对体育器材的研究应当从铸造工艺和维护保养着手,尤其是对铸造工艺的提升进行研究,能够支持体育资源的有效利用和持续性发展,现阶段的体育器材中镁合金使用较多,通过对比分析常规铸造法以及增压差压铸造工艺的疲劳性差异来提升体育器材的使用年限。
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发布时间：2023-12-18 - 摘要：<正>当前,越来越多的合金铸造类行业人士以及髙校开始意识到专业英语翻译的重要性,其在铸造技术的翻译中也特别重要。与铸造的规范性相比,专业英语的规范要求也一样重要。然而,合金铸造类专业的英语翻译十分困难,这也是该领域的英语翻译人员必须不断克服的问题。正确地翻译和合金铸造类专业的英语不仅对专业英语相关的研究很重要,而且对铸造技术的研究起到积极的作用。一、 2020年我国铸造行业的市场状况以及发展趋势铸造业是制造业的重要基础产业,其发展与世界经济的发展息息相关。自2000年以来,我国已超过美国,成为世界上最大的铸造生产国,并一直稳居世界第一。
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发布时间：2023-12-18 - 摘要：<正>我国现代机械制造工业中的基础工艺之一即为铸造,机械制造企业在激烈的市场竞争中为了站住脚跟必须要加大对生产效率的重视程度。提升生产效率的有效途径在于吸收国外的优秀经验和新技术并且加大与国外企业的合作与交流。随着全球经济化发展,国内外的企业交流越来越频繁,机械铸造行业趁着这股东风在技术进步和企业发展方面有了质的飞跃。也因为如此,企业对人才的机械铸造英语水平有了更高的要求。无论是在工程中还是对新技术的学习和研究中,英语都起到了重要的作用,一方面是与国外的工程师进行英语交流,另一方面是对英语文献进行翻译。
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发布时间：2023-12-18 - 摘要：In order to explore the structural transformation of superalloys for gas turbines in the service environment and their effects on the oxidation performance of the alloys,the microstructure of the Mar-M247 nickelbased superalloy after long-term aging at 900 ℃ was characterized by scanning electron microscope and energy dispersive spectroscopy,and the oxidation performances were investigated after different aging time.The results reveal that surface oxide phases of the alloy is changed fast and the oxide structure is complex at the initial stage of aging 1 000 h.The Al2O3 film is incomplete with thickness increasing obviously.As the oxidation time increases,a large number of holes and discontinuous island-like WO2 are generated in the W-rich film,Leading to the peeling of the inner Al2O3 film interface.The structure of outer oxidation film is simplified and the inner Al2O3 film grows and becomes uniform.After aging for 8 000 h,the thickness of whole oxidation film and rangeability of the inner Al2O3 film are decreased significantly.The whole oxidation structure tends to be stable.Due to the thickening of the protective Al2O3 film and homogeneous continuous structure,the oxidation performance of MarM247 superalloy is optimized.关键词：Ni-based Superalloys;Long-term Aging;Microstructure;Oxidation Film;Oxidation Layer Peeling
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发布时间：2023-12-18 - 摘要：Three generation single crystal superalloys（SRR99,DD32 and DD90）were designed by the combination of directional solidification technology and seeding method.The primary dendrite spacings were calculated by the direct measurement method and the square calculation method.The effects of grain boundary and crystallographic orientation on the primary dendrite spacing were eliminated.The average primary dendrite spacings of three superalloys are increased gradually with the increase of solidification heights,and the ones counted by two methods are similar,confirming the accuracy of the two methods.Moreover,the primary dendrite spacings of the superalloys is varied in a large range and present a normal distribution.The upper limit of the primary dendrite spacing is 5.4～8.5 times higher than the lower limit.关键词：Directional Solidification;Seeding Method;Single Crystal Superalloy;Primary Dendrite Spacing
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发布时间：2023-12-18 - 摘要：The micro-characterization and compressive tests of foamed magnesium alloys prepared with dolomite as foaming agent,SiC as tackifier were carried out,and effects of tackifier on the compressive properties and energy absorption of the alloy were investigated.The results reveal that the dolomite presents the un-complete decomposition as foaming agents for preparing foamed magnesium alloy.The undecomposed dolomite and its decomposition and reaction products are distributed uniformly in the pore wall and agglomerated locally at the edge of the inner pore.The tackifier SiC is agglomerated at the edge of the inner hole and the grain boundary of the pore wall structure in form of particulate in foamed magnesium alloy.Within the range of 5%～20%,with the increase of tackifier SiC content,the density,the platform stress and the absorbed energy per unit volume all shows a trend of decreases at first and then increases.The turning point is 10%.Within the range of strain of 0.1～0.6,with the increase of strain,the energy absorption efficiency of foamed magnesium alloy is increased rapidly at first,and then fluctuated up and down within a certain range,finally decreased rapidly.The fluctuation region is 0.1～0.6.The effects of SiC content on the energy absorption efficiency of foamed magnesium alloy can be ignored.关键词：Foamed Magnesium Alloy;SiC;Density;Compression Properties;Energy Absorption Properties
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发布时间：2023-12-18 -
Effects of Zn on As-cast Microstructures and Tensile Properties of Mg-10Gd-2Y-0.5Zr Magnesium Alloys
摘要：The effects of Zn addition on the as-cast microstructure and tensile properties of Mg-10Gd-2Y-0.5Zr magnesium alloy were investigated.The results show that the as-cast structure of Mg-10Gd-2Y-0.5Zr magnesium alloy is mainly composed ofα-Mg,Mg5（Gd,Y）and Mg24（Y,Gd）5phase,and after adding 0.5%～1.5%Zn,the as-cast structure of the measured alloy is mainly composed ofα-Mg,Mg5（Gd,Y,Zn）,Mg24（Y,Gd,Zn）5and Mg12（Gd,Y）Zn phase.In addition,the addition of Zn also has a obvious effect on the as-cast ambient tensile properties of the Mg-10Gd-2Y-0.5Zr magnesium alloys.After adding 0.5%Zn,the ambient tensile properties of the measured magnesium alloys are significantly increased.After adding 1.0%and 1.5%Zn,the ambient tensile properties of the alloys are gradually decreased.The magnesium alloy with 0.5%Zn has the satisfied comprehensive mechanical properties,and its tensile strength,yield strength and elongation reach up to 197MPa,160MPa and 4.37%,respectively.The influence of Zn content on the as-cast tensile properties of Mg-10Gd-2Y-0.5Zr alloys may be related with the formation and quantity of the second phase of Mg5（Gd,Y,Zn）,Mg24（Y,Gd,Zn）5and Mg12（Gd,Y）Zn in the as-cast structure of Zn-containing magnesium alloys.关键词：Magnesium Alloy;Rare Earth;Microstructure;Mechanical Properties;Zn- 2
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发布时间：2023-12-18 - 摘要：On the basis of Al-Mg-Si（6XXX）system alloy,the effects of w（Mg）/w（Si）ratio on microstructure,thermal conductivity and mechanical properties of the alloy were investigated by permanent mold casting.The results indicate that the primary phase is also changed with the change of w（Mg）/w（Si）.When the w（Mg）/w（Si）is less than 1.53,the phase composition in the alloy is mainly composed of eutectic Si、α-Al andβ-Mg2Si phase.When the w（Mg）/w（Si）is equal to 1.53,theθ-Al2Cu phase gradually appears in the alloy and the eutectic Si phase disappears.When the w（Mg）/w（Si）is greater than 1.53,the newS-Al2CuMg phase appears in the alloy,while theθphase is gradually decreased and finally disappears.The thermal conductivity of the alloy is 175.5 W/（m·K）,when the w（Mg）/w（Si）is 1.53.In addition,the optimal tensile strength and hardness are 153 MPa and 109.14HV and the elongation is 6.54%,respectively.关键词：Al-Mg-Si Alloy;w（Mg）/w（Si） Ratio;Permanent Mold Casting;Thermal Conductivity;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The force analysis on oxide inclusion in copper melt under super-gravity field was performed,and the equations of moving velocity and distance of inclusion particle along the direction of super gravity were established.The effects of gravity coefficient,inclusion features（size,type,content）and melt temperature on movement behavior of inclusion were also investigated by theoretical calculation under super-gravity field.The theoretical results indicate that directional separation process of oxide inclusion in the melt can be intensified effectively by super-gravity field,where the gravity coefficient,inclusion size and the density difference between inclusion and melt（solid-liquid density difference）have an obvious effect on moving behavior of inclusion particle.Besides,the larger gravity coefficient,particle size and solid-liquid density difference are beneficial to accelerating the floating and removal of inclusion.关键词：Super Gravity;Copper Melt;Oxide Inclusion;Separating Behavior;Theoretical Analysis
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发布时间：2023-12-18 - 摘要：The effects of Fe content on the microstructures and mechanical properties of squeeze casting Al-3.5Mg-0.8Mn alloys were analyzed by tensile and hardness test,scanning electron microscopy and X-ray diffraction.The results reveal that Fe can improve the mechanical properties,and only Fe-rich intermetallics of Al6（FeMn）phases is observed in the alloy.The ultimate tensile strength and yield strength are improved by increasing Fe content,however the elongation is decreased due to the increase of brittle Al6（FeMn）phases.With applied pressure of 75 MPa and the Fe mass fraction of 0.5%,the mechanical properties of the alloys present the satisfied effects,where ultimate tensile strength,yield strength and elongation reach 252 MPa,128 MPa and 28%,respectively.关键词：Fe;Al-Mg-Mn Alloy;Squeeze Casting;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：According to the structural characteristics of large and complex round-table titanium alloy castings,two kinds of casting processes were designed to optimize the casting process combined with simulation,of which the vertical bottom injection process was the satisfactory.Graphite mold casting process was used for production verification,and high-quality castings were obtained,of which the size structure,surface quality and internal quality all meet the requirements of Class I in GJB2896 A-2007.关键词：Titanium Alloy;Large Complex Structure;Graphite Mould;Casting Process
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发布时间：2023-12-18 - 摘要：The optimization of T651 heat treatment process for hot-rolled 7050 plate was investigated by means of OM,SEM,TEM and electronic universal testing machine.The fracture mechanism of the aging plate was analyzed and the optimized aging heat treatment process was presented.The results indicate that the second phase at the grain boundary of the plate are all basically dissolved into the aluminum matrix after the solution treatment at 475 ℃for 30 min with the satisfied solid solution effect.After the aging treatment at 130 ℃for 15 h,the mechanical properties of the plate reach the desirable value,where the tensile strength,yield strength and elongation of the alloy reach 603 MPa,539 MPa and 17%,respectively.关键词：Hot-rolled 7050 Plate;T651 Heat Treatment;Microstructure;Mechanical Properties;Fracture Mechanism
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发布时间：2023-12-18 - 摘要：The effects of annealing temperature and cryogenic holding time on the microstructure and mechanical properties of SLM-formed ZL114 Aalloy were investigated by OM,SEM,EDS and tensile testing.The results demonstrate that after 230℃×2 hannealing treatment,the elongation of the alloy is increased by 18.04%,while the tensile strength is decreased by 2.94%,and annealing treatment at 300 ℃ ×2 hresults in a decrease of28.19%in tensile strength and 4.55%in elongation of the alloy.The annealed microstructure of the alloy presents a large number of pores at the junction ofα-Al and Si phase.Cryogenic treatment（-196℃）can significantly improve the mechanical properties of SLM-formed ZL114 Aalloy,where the holding time of 36 hhas the best effect.Compared with the those of deposited state ones,its tensile strength and elongation are increased by 18.99%and23.03%,respectively.The cryogenic eutectic Si is more evenly dispersed in the matrix and transformed into a rodlike structure,which significantly enhances the plasticity of the alloy.关键词：SLM;ZL114A alloy;Annealing;Cryogenic Treatment;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The influence of different content Al-Ti-C master alloy on microstructure and properties of the plaster mold casting ZL205 Aalloy was investigated via metallographic analysis and tensile test.The results indicate that the grain refinement effect of ZL205 Ais desirable with 0.7% Al-Ti-C master alloy addition,which reaches 82μm.After T5 treatment,the ultimate tensile strength and elongation of ZL205 Aalloy with 0.7% Al-Ti-C master alloy reach 456 MPa and 8.2%,respectively,of which the mechanical properties are improved significantly compared with those of normal plaster ZL205 Aalloy.关键词：ZL205A Alloy;Al-Ti-C Master Alloy;Plaster Casting;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The effects of slurry preparation process and pouring temperature on the microstructure and mechanical properties of Al-Si-Cu-Si alloys were investigated.The results reveal that the Si phase in the alloy is passivated,however aggregation occurs after electromagnetic stirring.The size of primary Si is decreased after ultrasonic vibration treatment,of which the morphology is converted from dendrite to nearly sphericity.The count per unit area of Si phase particles reaches 0.46×103/mm2 with the roundness of 0.64,and the average grain size is 15.7μm.As the pouring temperature of slurry decreased from 620℃to 600℃,the microstructure is significantly refined,and the grain is coarsened as the decreasing in pouring temperature,with pore defects existing in the microstructure.When the slurry temperature is 600℃,the tensile strength of the alloy is 194 MPa,the elongation is 2.60%,and the hardness is 120.2 HB,which are improved by 10.23%,6.12% and 16.83%,respectively,compared with those of ones at 580℃.Meanwhile,the amount of fracture dimples is increased and the size of cleavage platform is decreased.关键词：Slurry Preparation Process;Semisolid Squeeze Casting;Al-Si-Cu-Mg Alloy;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：SiO2 aerogel（SA）reinforced aluminum matrix composites were prepared by casting,cold rolling and T6heat treatment.The effects of SA content on the microstructure（as-cast and cold-rolled and T6）and mechanical properties of Al-4Cu-0.1Sn alloy were investigated.The results indicate that the SA can be effectively added to the Al-4Cu-0.1Sn alloy,which is uniformly distributed into the crystal grain in form of sphere.In the as-cast state,the microhardness of the alloy shows an upward trend with the increase of SA.When the SA content is 0.02%,the average hardness reaches the highest of HV85,which is 49% higher than that of the alloy without SA,while the tensile properties of the alloy are slightly decreased with SA in the as-cast state.In the cold-rolled T6 state,when the SA content is 0.02%,the hardness of alloy is HV138.With the increase of SA,the yield strength and tensile strength of the alloy are firstly increased and then decreased.When the SA content is 0.04%,the yield strength and tensile strength of the alloy reach 320MPa and 401MPa,respectively,which is 10.3% and 10.7% higher than those of the alloy without SA.The mechanism SA enhancing the as-cast hardness of the Al-4Cu-0.1Sn alloy is to refine grains of the as-cast alloy and lead the second phase at the grain boundary to converting from a coarse skeletal shape to a fine discontinuous shape.The mechanism of adding SA to increase the strength of the T6state is to refine the Al2Cu phase and eliminate Al7Cu2Fe phase.关键词：Silica Aerogel;Al-4Cu-0.1Sn Alloy;Grain Refinement;Hardness Enhancement;Strengthening Mechanism
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发布时间：2023-12-18 - 摘要：MgO/Cu composites with different MgO contents were prepared by spark plasma sintering（SPS）with nano MgO particles as reinforcing phase.The effects of MgO particles content on arc erosion resistance of MgO/Cu composites were emphatically investigated,of which the arc erosion resistance mechanism was analyzed.Experimental results reveal that the arc erosion resistance of MgO/Cu composites is enhanced with the increase of volume fraction of MgO particles.When volume fraction of MgO particles is 5%,the total mass loss and arc energy of MgO/Cu composites reach the minimum value.The analysis indicates that MgO particles with high melting point is contributed to enhancing the mechanical properties and arc erosion resistance of MgO/Cu composites.During the process of arc erosion,the existence of MgO particles with high melting point can improve the molten pool viscosity of liquid copper matrix and reduce arc splashing,thus improving the arc erosion resistance of MgO/Cu composites.关键词：MgO/Cu Composite;Arc Erosion;Arc Energy;Mass Loss
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发布时间：2023-12-18 - 摘要：The preparation process and properties of hexagonal boron nitride（h-BN）particle reinforced magnesium matrix composites were investigated.A thin layer of pure nickel was coated on the surface of h-BN particles by electroless plating,which can significantly improve the wettability between h-BN and magnesium alloy melt and strengthen the interface bonding with the matrix.By adding Y element to magnesium alloy and consume Ni element fused with the nickel-plating layer,the long period stacking ordered（LPSO）structure composed of Mg-NiY can be successfully formed,and the magnesium matrix composite reinforced by hybrid h-BN and LPSO structure is obtained.After ultrasonic treatment（UT）,the thermal conductivity（TC）of the magnesium composite containing 3% h-BN reaches 99.92 W/（m·℃）,and the average coefficient of thermal expansion（CTE）of the composite from room temperature（RT）to 100℃is 18.36×10-6 K-1.The tensile strength and elongation of the composites reach 171 MPa and 3.9%,respectively.The magnesium alloy material with both high mechanical properties and excellent thermal properties was obtained.关键词：Magnesium Matrix Composites;h-BN;LPSO Structure;Thermal Properties;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Smooth Particle Hydrodynamics（SPH）is a meshless particle method,which has advantages in solving large deformation problems.A three-dimensional numerical simulation of AZ31 magnesium alloy during BPECAP process was carried out based on the SPH method.The simulated results were consistent with those in the literature,which verified the correctness of the SPH method back pressure program.The back pressure-equal channel extrusion process of AZ31 magnesium alloy under different process parameters were predictively simulated and analyzed from the perspective of equivalent plastic strain and damage value distribution.The simulated results reveal that the appropriate back pressure value can prevent effectively the initiation and propagation of cracks during the deformation of magnesium alloys.关键词：SPH;AZ31 Magnesium Alloy;Back Pressure-Equal Channel Extrusion Process;3D Numerical Simulation
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发布时间：2023-12-18 - 摘要：The thermal deformation behavior of GH5188 superalloy was investigated by the hot compression on the Gleeble-3500 hot simulation compression testing machine with the strain rate range of 0.001～0.1 s-1 and the deformation temperature range of 1 000～1 150℃.A constitutive model based on BP neural network was established,and the reliability of the constructed constitutive model was verified.Finally,the accuracy of BP neural network constitutive model based on error calculation was analyzed.The results indicate that the effect of temperature and strain rate on flow stress of GH5188 superalloy is very significant,and the flow stress of GH5188 superalloy is decreased greatly with the increasing in compression temperature or decreasing in the strain rate.After quantitative error calculation and analysis,date points where stress prediction deviation value of BP neural network constitutive model is within 10% account for 97.92%.Therefore,the BP neural network model can accurately predict the high temperature flow stress of GH5188 superalloy.关键词：GH5 188 Superalloy;Hot Deformation Behavior;Constitutive Model;BP Neural Network
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发布时间：2023-12-18 - 摘要：The distribution of shrinkage pipe in ingot with large ratio of height to diameter was investigated by numerical simulation and industrial experiment.The accuracy of the mathematical model was verified by the anatomical result of 5.3 tingot.On this basis,the formation mechanism of shrinkage pipe in 10.5 tingot was analyzed and the influence of different casting parameters on the distribution of shrinkage pipe in ingot was further discussed.The results indicate that the change of pouring temperature,pouring speed and cooling strength of the outer surface of the mold have little effect on the distribution of shrinkage pipe in ingots.With the increase of the insulation brick length,the depth of shrinkage pipe is decreased,and the increase of length of insulating brick of effect on the distribution of shrinkage pipe can be ignored when the length exceeds 500 mm.关键词：Ingot;Shrinkage Pipe;Casting Process
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发布时间：2023-12-18 - 摘要：The effects of injection rate,mold temperature and pouring temperature on porosity,oxidation tendency,cold-shut and shrinkage porosity in the Mg subframe castings were investigated by using AnyCasting software and orthogonal test method.The optimized die casting process parameters were presented as follows:injection rate of 7 m/s,mold temperature of 250℃,pouring temperature of 700℃.Under these process parameters,Mg subframe castings with sound surface and internal quality were produced by die casting process,and the effectiveness of optimizing the casting process parameters by simulation was also verified.关键词：Mg Alloy;Subframe;Die Casting;Casting Simulation;Orthogonal Test
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发布时间：2023-12-18 - 摘要：<正>近日,日本金属公司（Nippon Kinzoku）对外宣称,将展开镁合金蓄电池用负极新合金的试供应服务。与目前唯一具有高速充放电实绩、以活性碳作为正极的镁合金蓄电池相比,确认利用新开发的合金作为负极,将可以前所未有之速度进行200次的反复充放电。日本金属自1月起开始,提供负极用新合金,供应给企业或研究机构的开发人员,加速推动镁合金蓄电池的制品化。
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发布时间：2023-12-18 - 摘要：<正>综合国外媒体报道,特斯拉在其美国加州弗里蒙特工厂、得克萨斯州奥斯汀超级工厂,以及中国上海超级工厂、德国柏林工厂等4座整车工厂,都将或已经安装超大型压铸机,用于生产大型汽车底盘或车身压铸件。由欧洲某知名压铸机品牌所生产的超大型压铸设备,已经开始运进特斯拉正在建设的得克萨斯州奥斯汀超级工厂,首批运进的零部件分装在两个巨型箱子中。特斯拉奥斯汀超级工厂超大型压铸机的安装,意味着特斯拉目前已经确定的4座整车组装工厂,都将安装超大型压铸机。
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发布时间：2023-12-18 - 摘要：Magnesium alloy is the lightest metal structure material for application at present,which has a good application prospect in the lightweight aspect of aerospace.The aerospace application parts are gradually developed towards precision,thin-walled and integrated aspects with the application techniques and requirements increase.Compared with traditional magnesium casting techologies,the process characteristics of investment casting technology have unique advantages for the production of precision and complex thin-walled parts.The application of investment casting in magnesium alloy can better meet the requirements of aerospace parts.The forming technology of magnesium alloy was introduced,and the investment casting for the Mg alloy was emphatically summarized.The existing issue of metal-mold interface reaction and research status were reviewed.关键词：Mg Alloy;Investment Casting;Metal-mold Reaction
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发布时间：2023-12-18 - 摘要：Rare earth element is widely used in a variety of metal materials due to the effective and stable modification.The modification can refine alloy structure,thus improving mechanical properties,and the modification effect of different rare earth elements on aluminum alloy is different.The influence of several rare earth elements on the microstructure and mechanical properties of aluminum alloys as well as the modification mechanism was mainly introduced.Meanwhile,the present research status of rare earth aluminum alloys at home and abroad was reviewed.The existing problems were discussed and the future research was prospected.关键词：Rare Earth Elements;Aluminum Alloys;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The progress in WGB repair of superalloy vanes was reviewed,and advanced WGB repair methods at home and abroad were introduced,of which the characteristics was analyzed in depth.In conclusion,the existing problems of WGB technology were discussed and the future development was prospected.关键词：Superalloy;Wide Gap;Repair Brazing
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发布时间：2023-12-18 - 摘要：The fatigue strength and fatigue life of typical cast magnesium alloys were reviewed,and the initiation and propagation mechanism of fatigue cracks in cast magnesium alloys were described.The effects of the matrix microstructure,grain size,the second phase,the casting defects and working environment on the fatigue properties of magnesium alloys were expounded,and the methods to improving the fatigue properties of magnesium alloys were pointed out.Finally,the future tendency on magnesium alloy fatigue was put forward.关键词：Casting Magnesium Alloy;Fatigue Properties;Fatigue Crack;Strengthening Methods
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发布时间：2023-12-18 - 摘要：Aiming at the loose defects,shrinkage defects and pore defects in the ZL205A medium and large base castings,the initial casting process was analyzed,and the internal quality and mechanical properties of the product were tested.In addition,the reasons for the defects were analyzed.Some key technological measures were put forward,such as opening a channel for discharging slag,increasing pouring temperature,reducing pouring speed,increasing top mounting edge,and using chilling iron,graphite and chromite sand to quench the casting as a whole,those defects were eliminated,and the qualified ZL205A medium and large base casting was produced sucessfully.关键词：ZL205A;Low Pressure Casting;Casting Defects;Process Improvement
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发布时间：2023-12-18 - 摘要：Pockmark can easily occur on the surface of investment casting martensite chromium stainless steel,which is a common flaw and difficult to solve during investment casting.According to the formation mechanism,different test schemes were carried out to verify the necessary conditions for the formation of pockmark defects and various solutions were put forward.First special magnetic separation equipment was used for shell material magnetic separation to reduce magnetic oxide.Second,flake graphite sand is used as the transition layer during the process of shell making,which could not only create the reduction atmosphere but also prevent the penetration of ferric silicate,effectively avoiding the generation of pockmark.关键词：Investment Casting;Martensitic Chromium Stainless Steel;Pockmark;Flake Graphite Sand
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发布时间：2023-12-18
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