最新刊期
卷 41 ， 期 1 ， 2021
- 摘要：Magnesium alloys are known as green engineering materials in the 21st century,which is widely used in automotive,aerospace and 3C（Computer,Communication,Consumer Electronic）fields.As a common grain morphology during metal solidification,the dendrite morphology of magnesium alloy has an important effect on the final mechanical properties of castings.The research progress and development status on experimental characterization and simulation of dendrite growth of magnesium alloy with a hexagonal close-packed（HCP）crystal structure were reviewed.Dendrite morphology and preferred growth orientations of magnesium alloy in two and three dimensions were introduced based on the existing experimental results.According to the recent analog simulation in which the dendrite growth model was established by coupling the solute,temperature,flow and pressure fields,the influence of process conditions during solidification on the dendrite growth morphology of magnesium alloy was analyzed.Finally,the shortcomings existing in the current research on experimental characterization and simulation of dendrite growth of magnesium alloy and prospective development directions were pointed out.关键词：Magnesium Alloy;Dendrite Morphology;Preferred Growth Orientation;Experimental Characterization;Simulation
- 3
- |
- 80
- |
- 0
发布时间：2023-12-18 - 摘要：Linear shaped charge separation behavior of VW63 Zmagnesium alloy was investigated for the demand of aircrafts.Through the linear shaped charge cutting experiments of VW63 Z magnesium alloy specimens with different mechanical properties,the influence of tensile strength and elongation on linear shaped charge cutting as well as cutting mechanism were investigated.The results reveal that the linear shaped charge cutting is affected by the penetration depth,which is not seriously influenced by tensile strength when elongation is less than 6%.However,it is significantly affected by elongation after fracture and the penetration depth is gradually reduced with the increase of elongation,which is adverse to linear shaped charge cutting and separation.The cutting separation with cutting thickness of 7.2 mm could be stably achieved under the condition of elongation less than 6.5% and tensile strength less than 352 MPa.关键词：Linear Shaped Charge Cutting;Magnesium Alloys;Cutting Mechanism;Mechanical Properties
- 2
- |
- 20
- |
- 0
发布时间：2023-12-18 - 摘要：<正>当前,全球大中型城市地面交通越来越拥堵,不但影响出行,而且排放的温室气体也越来越多,城市空中交通（UAM）是目前被认为最可取的解决地面交通限制的新一代方案,就是采用"空中的士"。这种"空中的士"其实就是一架特制的小型直升机。在当前的技术条件下,为了达到安全、舒适与轻巧,这样的直升机优选的制造材料就是铝材和复合材料,而复合材料也是以铝为基体的,所以可以说"空中的士"几乎是全铝材料的。为了发展这种全铝的"空中的士",有关铝加工企业现在已与"的士"设计制造厂合作,共同探讨解决有关铝合金构件的设计制造问题。"空中的士"时代将会很快成为现实。
- 2
- |
- 2
- |
- 0
发布时间：2023-12-18 - 摘要：<正>长期以来,镁电池一直被认为是锂电池的理想代替品,因为其更安全、成本更低。但是由于电容量有限,镁电池的发展一直受限。据外媒报道,休斯顿大学（University of Houston）和丰田北美研究所（Toyota Research Institute of North America）的研究人员已经研发出一种新型阴极和电解液,可用于制作高功率镁电池,使镁电池不仅可在室温下工作,功率密度也能媲美锂电池。而阴极和电解液之前一直是影响镁电池发展的限制性因素。
- 2
- |
- 15
- |
- 0
发布时间：2023-12-18 - 摘要：<正>近日,美国铝业协会和罐头加工业协会（Can Manufacturers Institute简称CMI）联合发布了一份更新报告,详细叙述了铝罐在其他类型的包装应用优势正逐步增加。报告中提到,研究表明铝罐的回收率约为塑料瓶的两倍。铝制饮料罐中可回收成分约占73%,而玻璃瓶的可回收成分平均占比23%,塑料瓶仅有6%或更少。
- 2
- |
- 2
- |
- 0
发布时间：2023-12-18 - 摘要：The Zr-Cu-Fe-Al amorphous alloy was prepared by copper mold casting.The effects of the Al content and atomic ratio of Cu to Fe on the glass forming ability（GFA）,thermal stability and microstructure were investigated by X-ray diffractometer,differential thermal analyzer and high-resolution transmission electron microscopy.The results reveal that the GFA of both Zr59(Cu0.5Fe0.5)41-xAlxand Zr67-x(Cu0.5Fe0.5)33Alxalloy are firstly increased and then decreased with the increase of the Al content.For Zr59(Cu1-xFex)33Al8alloy,the glass forming ability is a better when the atomic of Cu to Fe is between 5∶5and 8∶2.Theγparameter and crystallization temperature indicate that Zr59(Cu0.7Fe0.3)33Al8alloy exhibits the excellent GFA and high thermal stability.Moreover,the HRTEM result of Zr59(Cu0.5Fe0.5)33Al8alloy indicates that due to the positive enthalpy between Cu and Fe,the alloy undergoes liquid-liquid phase separation during the rapid cooling,forming Cu-rich and Fe-rich liquid phases and then liquid-glass transition occurs,resulting in phase separation nanocrystals in which glassy Fe-rich nanoparticles with high number density are distributed on the glassy Cu-rich matrix.关键词：Glass Forming Ability;Thermal Stability;Microstructure;Liquid-liquid Phase Separation
- 2
- |
- 51
- |
- 0
发布时间：2023-12-18 - 摘要：The effects of microstructure on the wear properties of hypoeutectic Al-10Mg2Si alloy after melt superheating treatment were investigated by means of the grinding-disk friction and wear test.The results reveal that the primaryα-Al phase is converted from fishbone to equiaxed structure,and Mg2Si phase is uniformly distributed in fibrous and short rod shape after melt superheat treatment.The secondary dendrite interval of Mg2Si phase is decreased by 58%,and the hardness is increased by 13.5%,meanwhile the wear rate is decreased by 16.49%.The wear debris is changed from push milling flake type and curl type without melt superheating treatment to small powder shape.The wear debris are converted from pull-chip and crimp type without superheating treatment to small powder shape.The spalling area is decreased,and the spalling pit,furrow and extrusion groove become shallow.The wear mechanism is dominated from adhesive wear,oxidation wear and abrasive wear to coexisting of delamination wear,adhesive wear and partial oxidation wear,which indicate that the melt superheating process can improve the wear properties of the alloy.关键词：Hypoeutectic Al-10Mg2Si;Melt Superheating Treatment;Microstructure;Wear Behavior
- 2
- |
- 11
- |
- 0
发布时间：2023-12-18 - 摘要：Deformed magnesium alloy is limited by metal forming process,resulting in poor formability at room temperature and strong anisotropy.By pre-deformation combined with annealing under different deformation conditions,the texture of magnesium alloy can be weakened effectively and the mechanical properties of magnesium alloy can be improved.The effects of three pre-deformation methods combined with annealing on microstructure and mechanical properties of magnesium alloys were reviewed,and future tendency was pointed out.关键词：Pre-deformation;Annealing;Magnesium Alloy;Microstructure;Mechanical Properties
- 2
- |
- 128
- |
- 0
发布时间：2023-12-18 - 摘要：High-entropy alloy（HEA）,which breaks the design concept of traditional alloy,is a new type of alloy composed of multiple main elements.However,most high-entropy alloys usually have poor fluidity and castability as well as larger compositional unevenness,which is adverse to the large-scale industrial application.Eutectic high-entropy alloys（EHEAs）exhibit the characteristics of high-entropy alloys and eutectic alloys simultaneously,which can reduce casting defects and have unique advantages in high-temperature application.Therefore,it is of great significance to design and preparation of eutectic high-entropy alloys.The research progress of melting eutectic high-entropy alloys at home and abroad was reviewed.The phase composition and properties of the alloys as well as the growth characteristics and mechanism of the eutectic morphology were introduced.Subsequently,the phase formation law of eutectic high-entropy alloy and the design method of eutectic composition were summarized.Finally,the forward research direction of eutectic high-entropy alloy was prospected.关键词：Eutectic High-entropy Alloy;Mechanical Properties;Laser Cladding;Alloy Design
- 2
- |
- 286
- |
- 0
发布时间：2023-12-18 - 摘要：The theoretical and experimental research of high entropy alloys with various phase structures were reviewed,and the contents and applications of various phase formation criteria proposed on the phase formation rules of high entropy alloys were summarized,which was expected to provide ideas for establishing the phase formation rules of high entropy alloys.关键词：High Entropy Alloy;Phase Structure;Phase Formation Criterion;Alloy Design
- 2
- |
- 170
- |
- 0
发布时间：2023-12-18 - 摘要：5% Al35Ti15Cr20Mn20Cu10/6061 Al composites were prepared by mechanical alloying and spark plasma sintering.The effects of sintering temperature were mainly investigated on microstructure and mechanical properties of lightweight high entropy alloy reinforced aluminum matrix composites.With the sintering temperature of 540 ℃,the relative density of the composite reaches the maximum value of 98.6%.Meanwhile,an obvious transition layer is generated between the matrix and the reinforcement,which is dominated by diffusion bonding.With the increase of sintering temperature,the yield strength of the composites shows a trend of rising firstly and then decreasing.At 540℃,the yield strength of the composite reaches 186 MPa,which is about 75% higher than that of the matrix,extremely closing to the calculated value of the Iso-strain model.关键词：Lightweight High Entropy Alloy;Al Matrix Composite;Spark Plasma Sintering;Transition Layer
- 2
- |
- 82
- |
- 0
发布时间：2023-12-18 - 摘要：The effects of different solution temperature and different aging time were investigated on the structure and properties of graphene reinforced magnesium matrix composites prepared by thixmolding process.The results reveal that hardness of the composites gradually is decreased as the solution temperature increases.The composite reaches the maximum hardness at 200℃regardless of air cooling or water cooling.Meanwhile,the content ofβ-Mg17Al12 phase is increased firstly and then decreased,and theβphase almost disappears at 400℃.As the aging time increases,the hardness of the composites is firstly increased and then decreased,reaching a maximum of 93.17 HV at the aging time of 12 h.After solution treatment and aging treatment,the graphene exists stably in the matrix of the composites,affecting the hardness of the composites.关键词：Magnesium-based Composites;Solid Solution Temperature;Aging Time;Hardness;Graphene
- 2
- |
- 52
- |
- 0
发布时间：2023-12-18 - 摘要：Cristobalite was added as a high-temperature reinforcing phase to the matrix material of the SiO2-based ceramic core prepared by hot pressure injection.The influence of the particle size of pre-added cristobalite on the performance of SiO2-based ceramic cores was investigated.The enhancement mechanism of cristobalite particle size on the porosity and high temperature creep resistance of SiO2-based ceramic cores was analyzed.The results indicate that the apparent porosity of the SiO2-based ceramic core is gradually increased as the particle size of cristobalite decreases,and the room temperature bending strength and high temperature deflection are gradually decreased.When the particle size of cristobalite is 13μm,the apparent porosity of the SiO2-based ceramic core reaches the maximum value,and the high temperature deflection reaches the minimum value,which are 42.30% and 0.14 mm,respectively.关键词：Cristobalite Granularity;SiO2-based Ceramic Core;High Temperature Deflection;Enhancement Mechanism
- 2
- |
- 29
- |
- 0
发布时间：2023-12-18 - 摘要：The effects of different cryogenic holding times（12、24、36、48 h）were mainly investigated on the residual stress,density,microstructure and mechanical properties of 3D orthorhombic Cf/Al composites with a fiber volume fraction of 50% prepared by vacuum infiltration,and the influence mechanism was analyzed.The results indicate that cryogenic treatment can improve the microstructure and density of 3D orthorhombic Cf/Al composites,which also has a significant effect on the residual stress and mechanical properties.After cryogenic treatment,the residual stress of 3D orthorhombic Cf/Al composites is decreased,and it is decreased continuously with the increase of the cryogenic holding time.The cryogenic treatment can significantly enhance the tensile strength and elastic modulus of the 3D orthorhombic Cf/Al composites,which can reach maximum value of 841.33 MPa and 132.19 GPa after 36 h,and increased by 13.9%、24.9%compared with those in the as-cast state,respectively.Besides,the microstructure improvement and the residual stress release are the main reasons for enhancing mechanical properties of 3D orthogonal Cf/Al composites.关键词：Vacuum Pressure Infiltration;3D Orthogonal Cf/Al Composites;Cryogenic Treatment;Residual Stress
- 2
- |
- 34
- |
- 0
发布时间：2023-12-18 - 摘要：<正>工信部部长肖亚庆在近日召开的2021年全国工业和信息化工作会议上表示,2021年将有序推进5G网络建设及应用,加快主要城市5G覆盖,推进共建共享,新建5G基站60万个以上。肖亚庆表示,要以5G建设为牵引,统筹部署数据中心和算力设施。同时聚焦10个重点行业,形成20大典型工业应用场景,开展工业5G专网试点,并适时发布部分频段5G毫米波频率规划。
- 2
- |
- 1
- |
- 0
发布时间：2023-12-18 - 摘要：<正>近日,西南铝业（集团）有限责任公司航天用铝合金锻环顺利通过工业和信息化部第5批制造业单项冠军产品审核,首次荣获制造业单项冠军产品称号。制造业单项冠军是国家为引导制造企业专注创新和产品质量提升,推动产业迈向中高端,带动中国制造走向世界而开展的制造业单项冠军培育提升专项行动。评审分制造业单项冠军企业和制造业单项冠军产品两个大类。
- 2
- |
- 5
- |
- 0
发布时间：2023-12-18 - 摘要：<正>近日,由中国科学院大连化学物理研究所（以下简称"大连化物所"）研制的镁海水燃料电池系统顺利完成了3 000m深海试验,实现了新型镁海水燃料电池在深海装备上的首次实际应用。新型镁海水燃料电池是直接利用海水,将镁的化学能转化为电能的电化学装置,具有能量密度高、安全性好、可全海深工作的特点,在深海着陆器、深海原位实验站等海洋装备领域具有很好的应用前景。
- 2
- |
- 45
- |
- 0
发布时间：2023-12-18 - 摘要：<正>从2020年9月份开始,中国汽车零部件出口金额连续3个月创出新高,11月份汽车零部件出口更是同比大增41.9%。根据中国汽车协会公布数据显示,2020年11月汽车零配件出口金额为59.6亿美元。随着疫情逐步得到控制,我国汽车销量逐月攀升。据中汽协数据,2020年9月,我国汽车销量达256.5万辆,环比增长17.4%,同比增长12.8%,10月延续增长态势,汽车销量达到257.3万辆,环比增长0.1%,同比增长12.5%。
- 2
- |
- 4
- |
- 0
发布时间：2023-12-18 - 摘要：<正>海关总署最近的数据显示,截至2020年11月,中国铝进口量已经创下年度纪录高位,超过了2009年的前记录。海关总署表示,中国2020年11月进口了188 973t未锻造的铝和铝制品。根据计算,11月进口量较10月份下降了26.4%,但较去年同期增长158.6%。1～11月进口量为244万t,比去年同期增长了4倍,超过了2009年全年的232万t进口量。
- 2
- |
- 0
- |
- 0
发布时间：2023-12-18 - 摘要：NbCr2/Nb dual-phase alloys with composition of NbCr22.5-xNd2O3 with different Nd2O3 contents were prepared by mechanical alloying and hot pressing.The effects of Nd2O3 on microstructures and properties of NbCr22.5 alloy were investigated.The results show that the effects of Nd2O3 on phase components of NbCr22.5alloy can be neglected.The strength,plasticity and toughness of NbCr22.5 alloy are improved obviously by adding proper amount of Nd2O3.Compared to the NbCr22.5 alloy,the room-temperature compressive strength and plastic strain of NbCr22.5（Nd2O3）0.125alloy reach up to 3 193MPa and 13%,which is increased by 15.7% and 137.2%,respectively.关键词：NbCr2/Nb Dual-phase Alloy;Nd2O3;Room-temperature Mechanical Properties
- 2
- |
- 8
- |
- 0
发布时间：2023-12-18 - 摘要：The effects of process parameters on the solidification structure of cast rolled brass strip were investigated by CAFE module of ProCAST finite element software.The microstructure,hardness and mechanical properties of brass strip prepared by twin roll casting based on the self-developed rolling machine were analyzed.The results reveal that the process parameters affect the size and reduction rate of columnar grains by affecting the height of the Kiss point.The higher the Kiss point and the greater the reduction rate is,the larger the columnar grain growth space and the grain size is.By adjusting the nucleation parameters,a larger reduction amount and fine solidification structure can be obtained,which can improve the quality of the strip.The elongation of cast rolled brass strip can reach 33%,the tensile strength is 430 MPa,and the hardness is 140 HV.The elongation,the tensile strength and the hardness of annealed brass strip are 55%,340 MPa and 75 HV,respectively.关键词：Twin-roll Casting;Brass Strip;CAFE Microstructure Simulation;Mechanical Properties
- 2
- |
- 25
- |
- 0
发布时间：2023-12-18 - 摘要：The effects of Y addition（0.02,0.05,and 0.10%）on microstructure,mechanical properties,electrical properties of Al-0.16 Zr alloy were investigated.The results indicate that 0.05%and 0.10%Y addition can remarkably refine the grain size,and within range of the Y addition,the refinement becomes more effective with Y addition increase.During the aging treatment of as-cast alloys at 350℃,the Y addition leads to obvious age hardening,and the higher Y addition is,the shorter the peakaging time is.However,the electrical conductivity is reduced due to existence of lattice mismatch distortion field,which is attributed to the accelerated precipitation of coherent Al3 Zr particles.Moreover,in the aging treatment of rolled alloys,hardness is still enhanced with Y addition,in spite of annealing softening caused by reduction of dislocation density.In comprehensive consideration,the rolled Al-0.16 Zr-0.10 Yalloy obtains the optimal hardness and electrical conductivity combination after aged at 350℃for 30 h.关键词：Al-Zr Alloy;Y Addition;Microstructure;Hardness;Electrical Conducitivity
- 2
- |
- 25
- |
- 0
发布时间：2023-12-18 - 摘要：The effects of ultrasonic power and treatment time on the solidification structure and mechanical properties of Mg-9Al-3Si alloy were investigated.The results reveal that refinement of the structure and improvement of the mechanical properties of the alloy can be achieved by controlling the ultrasonic parameters.In the range of 0～900 W,with the increase of ultrasonic power,the Mg2Si phase in the alloy is gradually refined,and its tensile strength is increased firstly and then decreased,where the turning point is 700 W.In the range of 0～90 s,with the increase of ultrasonic treatment time,the Mg2Si phase in the alloy is gradually refined,and its tensile strength is increased firstly and then decreased,and the turning point is 60 s.The fracture morphology of Mg-9Al-3Si alloy without ultrasonic treatment presents cleavage fracture,while the size of cleavage step of Mg-9Al-3Si alloy is decreased after ultrasonic treatment,characterized by quasi-cleavaye fracture.关键词：Mg-Al-Si Alloy;Ultrasonic Treatment;Solidified Structure;Mechanical Properties
- 2
- |
- 27
- |
- 0
发布时间：2023-12-18 - 摘要：High temperature tensile tests of hot-rolled annealing TC4 titanium alloy profile were carried out at 773 K,993 Kand 1 093 K,respectively with 1 mm/min,0.618 mm/min,0.382 mm/min and 0.236 mm/min.The microstructure of TC4 titanium alloy was observed by metallographic microscope,and the effects of different deformation temperature and strain rate on the microstructure evolution of TC4 titanium alloy were investigated.The results indicate that when the stretching rate is constant,the lamellarαphase in the microstructureis is firstly converted into the equiaxedαphase with the increase of deformation temperature.With the further increase of temperature,the grain boundary is broken,of which theαphase also began to undergo equiaxed transformation,and the microstructure is converted from weissmann microstructure to equiaxed microstructure.When the deformation temperature is constant,with decreasing in the stretching rate,the fineness and equiaxed degree of the laminar and grain boundaryαphases in the microstructure are increased,and the weissmann structure is converted to the equiaxed structure.关键词：TC4Titanium Alloy;High Temperature Tensile;Microstructure;EquiaxedαPhase
- 2
- |
- 152
- |
- 0
发布时间：2023-12-18 - 摘要：The effects of liquid die casting and semi-solid rheo-die casting on the fatigue behavior of ZL114 Aaluminum alloy parts were investigated.The results indicate that semi-solid rheo-die castings have better and more stable fatigue performance than traditional liquid die castings.The fatigue life of liquid die-casting parts is mainly affected by the size of holes.With increasing in the hole size,the fatigue life of the castings is decreased.The fatigue life of semi-solid die-casting parts is mainly affected by the density and proportional to the density.The semi-solid die-casting ZL114 Aaluminum alloy samples have a satisfied fatigue performance when the density is more than 2.62 g/cm3.At 70 MPa,the fatigue life can reach 107 cycles.Cracks of liquid die-casting parts are mainly initiated from gas holes while those of semi-solid die-casting parts tend to be initiated from multiple shrinkages porosity.关键词：ZL114ACasting Aluminum Alloy;Semisolid;Fatigue Behavior;Casting Defects
- 2
- |
- 51
- |
- 0
发布时间：2023-12-18 - 摘要：Al-Ti-C-Ce master alloy was prepared by villiaumite based on ratio of w（Ti）∶w（C）=15∶1.The microstructure and grain-refining performance of Al-Ti-C-Ce mater alloy were investigated using optical microscopy（OM）,SEM,and the chemical composition of the selected areas were tested by EDAX and EPMA.The results indicate that the shape and distribution of TiAl3 and TiC are improved,and the TiC particles are refined,leading to the homogeneous distribution of TiAl3 and TiC phases.TiAl3 can react with rare-earth Ce to form Ti2Al20Ce compound,concentrating on the block white TiAl3 phase.The refinement effect of Al-4.5Ti-0.3C-1Ce refiner on the pure Al is remarkable,which is optimal after adding 0.015%Ti,where the grain size reaches 70μm.关键词：Ce2O3;Grain Refiner;Al-Ti-C-Ce Master Alloy;TiC;Rare Earth
- 2
- |
- 43
- |
- 0
发布时间：2023-12-18 - 摘要：7075 aluminum alloy was prepared by permanent mold casting（PMC）,liquid squeeze casting（LSC）and semi-solid squeeze casting（SSC）methods.The effects of different casting processes on the thermal conductivity and mechanical properties of 7075 aluminum alloy were investigated.The results indicate that the grains of the PMC are coarse,and dendrite segregation occurs to reduce the plastic toughness.The tensile strength and elongation are 121 MPa and 2.78%,respectively.However,the coarse grains exhibit a wide heat conduction path,lower electron scattering probability,long mean free path and relatively high thermal conductivity,which reaches139.67 W/（m·K）.The tensile strength and elongation of the LSC refined grains are 239 MPa and 5.75%,respectively,while fine grains and more dendritic arms lead to the higher electronscattering,with the lowest thermal conductivity,which is 120.94 W/（m·K）.SSC grains are compact fine and round,with the highest tensile strength and elongation of 248 MPa and 7.46%,respectively,and the thermal conductivity is 126.07 W/（m·K）.关键词：7075Aluminium Alloy;Permanent Mold Casting （PMC）;Liquid Squeeze Casting （LSC）;Semi-solid Squeeze Casting （SSC）;Thermal Conductivity
- 2
- |
- 114
- |
- 0
发布时间：2023-12-18 - 摘要：Flux purification method（flux protection and flux refining）and gas purification method（protective atmospheres and inert gas bubbling）were employed to prepare Mg-Nd-Zn-Zr melt,and the zirconium alloying phase and the final refining effects were analyzed comparatively.The experimental results demonstrate that both purification methods lead to a qualified chemical composition.Though a satisfactory grain refinement effect can be obtained by both methods,the gas method exhibits the smaller grain.Both methods can effectively protect Mg melt and separate inclusions from the melt,however the flux method is more effective in the control of inclusions.关键词：Magnesium Melt;Flux Purification Method;Gas Purification Method;Zirconium Alloying;Refining
- 2
- |
- 22
- |
- 0
发布时间：2023-12-18 - 摘要：The effects of ceramic shell materials on microstructure and properties of superalloy blade were investigated by numerical simulation combined with experiments.The results reveal that the cooling rate of alumina shell casting is greater than that of mullite shell casting without ceramic insulating cotton wrapping,and the microstructure and properties of alumina shell casting are better.When the casting is wrapped with ceramic insulating cotton,although the cooling rate of airfoil of alumina shell casting is still greater than that of mullite shell casting,the cooling rate of root of alumina shell casting is less than that of mullite shell casting,which means that the microstructure and properties of root of mullite shell casting are better,while the airfoil of that are worse.The numerical simulation results of the airfoil is coincided with the experimental ones when wrapped with ceramic insulating cotton.关键词：Ceramic Shell Material;Superalloy Blade;Numerical Simulation;Microstructure
- 2
- |
- 23
- |
- 0
发布时间：2023-12-18 - 摘要：The characteristics and formation mechanism of surface defects such as cold shut,surface segregation layer,surface segregation burl and pull marks in semi-continuous casting aluminum alloy ingot were introduced.The effects of mold structure and casting process parameters on the surface defects during semi-continuous casting were analyzed.On this basis,the technical development and process optimization directions to improve ingot surface quality were presented.关键词：Aluminum Alloys;Semi-continuous Casting;Surface Quality of Ingot;Surface Segregation
- 2
- |
- 74
- |
- 0
发布时间：2023-12-18 - 摘要：Mg-Zn-Sn alloys with different contents of Zn and Sn at a total amount of 10% were prepared by metal molds,and the as-cast structure,especially the non-equilibrium eutectic structure and the mechanical properties of the alloys were investigated.The results show that the as-cast structure of Mg-Zn-Sn alloys is composed ofα-Mg,MgZn and（or）Mg2Sn.Lamellar eutectic phases can be generated in the Mg-Zn-9Sn with high Sn content and Mg-9Zn-Sn alloys with high Zn content.The eutecticβphases（MgZn and Mg2Sn）in Mg-5Zn-5Sn alloys with the same content of Zn and Sn are uniformly distributed in the grain boundary in form of small blocks and the morphology of the eutectic phases is presented almost all divorced structures.The volume fraction of the non-equilibrium eutectic was calculated by the Schiel equation.The eutectic fraction of Mg-9Zn-Sn alloys with 9% Zn content is as high as 14%,and the eutectic structure almost all presents a lamellar structure.The experimental results of mechanical properties show that the Mg-5Zn-5Sn alloys has the desirable comprehensive mechanical properties.In addition,according to the test results of the solid solution amount of Zn and Sn atoms in magnesium matrix,the strength and toughness of alloys were further analyzed.关键词：Mg-Zn-Sn （ZT）Alloys;Non-Equilibrium Eutectic;Mechanical Properties
- 2
- |
- 28
- |
- 0
发布时间：2023-12-18 - 摘要：Misrun is one of the common casting defects in low-pressure casting of copper alloy.Numerical simulation can not only predict the final morphology of misrun,but also further analyze the formation and evolution of misrun.The key to predict misrun is to deal with the effect of alloy mushy zone on flow behavior.The model of variable viscosity-porous medium-critical solid fraction of copper alloys in the mushy region was modified,and based on the parameters of variable physical properties,the simulated results between it and the model of variable viscosity-critical solid fraction were calculated and analyzed comparatively.The actual production shows that the modified model of variable viscosity-porous medium-critical solid fraction can predict accurately the misrun defects,and the numerical calculation model is more reliable.关键词：Copper Alloy;Low-pressure Casting;Misrun;Mushy-region Model;Numerical Simulation
- 7
- |
- 45
- |
- 0
发布时间：2023-12-18 - 摘要：Based on the defects analysis of a front oil-seal flange and using the fishbone diagram quality tool,the origination of air hole defects in the product and its location were analyzed.To solve the air hole defects,the exhausting system and overflow system were optimized according to the die-casting theory and numerical simulation analysis.The results reveal that through the numerical simulation and rational arranging exhausting system,the gas hole defects can be solved effectively.关键词：Oil Seal Flange;Gas Hole;Numerical Simulation;Fishbone Diagram
- 2
- |
- 17
- |
- 0
发布时间：2023-12-18 - 摘要：Aiming at the issue of solder defects in shell die castings for new energy automobile motor,some measures were adopted from die structure design,3D printing inserts to balance die temperature,preventing high temperature molten aluminum from destroying the dense layer of mould surface to improve the defect of solder during production.The solution to application of 3D printing insert was proposed.关键词：Solder of Die Casting;Random Cooling;3D Printing;Mold Temperature
- 2
- |
- 57
- |
- 0
发布时间：2023-12-18 - 摘要：The mechanical properties and qualified rate of M35-1 nickel copper alloy were greatly improved by understanding the burning loss rate of carburant,ferrosilicon and ferromanganese in the melting process of M35-1 nickel copper alloy as well as narrowing the composition range of C,Si and Mn with in ASTM standard.Meanwhile,the quality of liquid alloy during melting and pouring was improved,avoiding internal defects of M35-1 nickel copper alloy caused by slag inclusion defect,which ensures the stability of mechanical properties.关键词：M35-1 Nickel Copper Alloy;Mechanical Properties;Carburant;Burning Loss Rate;Filter
- 2
- |
- 26
- |
- 0
发布时间：2023-12-18
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备09064830号-19
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0