最新刊期
卷 44 ， 期 3 ， 2024
- 摘要：An efficient and low-cost uniform solidification control process of aluminum alloy was developed for the preparation of large-volume semisolid slurry， which is called air-cooled stirring rod （ACSR） process. The slurrying process was related to die-casting machines to form integrated and intelligent rheological die-casting production lines for high-efficiency rheo-diecasting of large-scale and thin-walled aluminum alloy parts. Nowadays， 40 kg semisolid slurry with a solid fraction of 25%~35% within 30 s was achieved by ACSR process， which achieved industrial application in the formation of large and thin-walled aluminum alloy parts with high quality， such as new energy vehicles and 5G communications. Typical products cover cooling shell for 5G communication， filter shell， antenna case， three-electric structure shell for new energy vehicles， end cover， ABS system valve body， etc. Compared with the traditional die castings， components manufactured by the new process possesses fine and spherical microstructure， satisfied surface quality， less internal pores， as well as desirable mechanical properties and thermal conductivity.关键词：Aluminum Alloy;Uniform Solidification Control;Semisolid Slurry;Rheological Die-casting
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发布时间：2024-03-25 - 摘要：In order to solve the problem of rough dendritic and element segregation in as-cast refractory high entropy alloys， Al0.1（MoNbTa0.7ZrTi） refractory high entropy alloy was fabricated through a non-self-consumption vacuum arc smelting furnace， and uniaxial high-temperature compression test was carried out on the Gleeble-3500 test thermal simulator under different temperatures. The influence of deformation temperatures on microstructure of Al0.1（MoNb- Ta0.7ZrTi） refractory high entropy alloy was explored. The results indicate that Al0.1（MoNbTa0.7ZrTi） refractory high entropy alloy retains a body-centered cubic two-phase solid solution structure without phase composition transformation after high-temperature deformation. The phenomenon of elemental segregation is gradually weakened with the increase of deformation temperature. Meanwhile， the morphology becomes uniform and the size of the dendrite grain is refined.关键词：RHEA;High Temperature Deformation;Body-centered Cubic Structure;Dendrite;Segregation
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发布时间：2024-03-25
Current Recommendation
- 摘要：The main stress direction of nickel-based single crystal superalloy blade is ［001］ crystallographic direction. However， the blade stress direction generally deviates from the ［001］ orientation at a certain angle during actual preparation. The research progress on the creep behavior of nickel-based single crystal superalloys with different angles deviating from ［001］ crystallographic orientation was introduced， and the relationship between creep behavior and deviation from ［001］ crystallographic orientation was summarized. In a word， the orientation deviation angel has little influence on the creep property of superalloy at high temperature， while the creep property of single crystal superalloys with small deviation from ［001］ orientation and close to ［011］ orientation is superior to that of ones close to ［111］ orientation at medium temperature.关键词：Nickel-Based Single Crystal Superalloy;Orientation Deviation Degree;Creep Deformation;Creep Life
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发布时间：2024-03-25 - 摘要：The research status on the effects of adding Sn separately and combined additions of Sn and other elements on microstructure and mechanical properties of magnesium alloys such as Mg-Al， Mg-Zn， Mg-Li or Mg-RE systems were reviewed. At the same time， the research and development of novel magnesium alloys with Sn addition， such as Mg-Al-Sn， Mg-Sn-Zn， Mg-Sn-Mn， Mg-Sn-Ca/Sr， Mg-Sn-Bi and Mg-Sn-RE based alloys， were also introduced.关键词：Magnesium Alloys;Containing-Sn Magnesium Alloys;Microstructure;Mechanical Properties
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发布时间：2024-03-25 - 摘要：Ti-45Nb alloy possesses low density， high plasticity， high specific strength， low Young's modulus， and exhibits desirable mechanical and cold working properties， resistance to spontaneous combustion， and excellent corrosion resistance. The characteristics of physical properties， crystal structure as well as microstrucutre and properties of Ti-45Nb alloys and preparation process of common Ti-45Nb alloys were reviewed， and methods to improve the properties of Ti-45Nb alloys as well as the research status of Ti-45Nb alloys were introduced.关键词：Ti-45Nb Alloy;Properties;Strengthening
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发布时间：2024-03-25
Research·Review
- 摘要：The CET （Columnar to equiaxed crystal transition） process of Inconel 718 alloy during directional solidification was numerically simulated based on multi-phase field model. The CET solidification structure was explored under different temperature gradients， and dendrite evolution law of equiaxed， columnar， and mixed crystals were investigated. In addition， the concentration variation patterns of Nb and Cr along height direction were also analyzed. The results indicate that the solidification mode of Inconel 718 alloy is converted from columnar to equiaxed crystals as the temperature gradient decreased from 400 K/cm to 10 K/cm. During the solidification process， Nb is segregated in the liquid phase， while Cr is segregated in the solid phase.关键词：Directional Solidification;Inconel 718 Alloy;Phase-field Method;Microstructure Evolution
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发布时间：2024-03-25 - 摘要：A mathematical model was established to investigate the influence of nondam on flow field in tundish in a Chinese steel mill， and a water model was adopted to verify the mathematical model. The results indicate that in the tundish with dams， the colliding zones are inner-space of inhibitor and the zone between upper and lower baffles. The tundish without dams operates with large volume of ultra-low-velocity zone， enlarged dead zone and ultra-long residential time. The inhibitor was modified and the diameter of hole was increased to 75 mm and the width was increased to 150 mm， which can reduce dead zone and ultra-low-velocity zone， greatly extending the average residential time. The flux rate of argon blowing in shroud can be increased to 2.5×10-4 Nm3/min without hot eye and slag entrainment， which helps to removal of inclusion. However， inclusion-easy-colliding zone is decreased abundantly after removing the dams in tundish.关键词：Tundish;Dam;Flow Field;Slag Entrainment
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发布时间：2024-03-25
Research·Computer Application
- 摘要：In order to achieve a high-strength combination of copper/steel bimetals and avoid problems such as interface cracking and copper layer detachment， the traditional solid-liquid composite casting was combined with the quenching process to investigate the effect of quenching on microstructure and mechanical properties of the copper/steel bimetallic interface. The results indicate that the quenching process accelerates the cooling rate， and the α-Cu phase dendrites are refined. With the quenching temperature of 800 ℃， Pb particles are refined and uniformly distributed with the decrease of grain size on the copper side of fine grain region， increasing the grain boundaries of the α-Cu， where the inter-diffusion distance of copper /steel bimetallic atomic is increased to 11.95 μm， and the shear strength reaches the highest value of 247.2 MPa， obtaining desirable mechanical properties.关键词：Quenching;Pb Particles;Grain Boundary;Mechanical Properties
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发布时间：2024-03-25 - 摘要：Taking the brake disc of a split solid new energy vehicle as object， satisfied pouring process parameters were designed based on the ProCAST simulation results. A hemispherical buffer area was added into the pouring system to realize the sequence solidification， and the pressure parameters during the stage of vacuum pumping， filling and holding were optimized. The holding time and solidification time were determined as 260 s and 180 s， respectively， and the brake disc body with well surface was cast by mechanical stirring method. Defect analysis reveals that the local coarse dendrite crystals exist in the matrix， and the particle accumulation at the front of filter reaches 30% （volume fraction）， while the SiC content in the matrix after filtration is only 18%. After changing mechanical stirring to ultrasonic-electromagnetic stirring， coarse dendrites in the disc are broken， and SiC particles are evenly dispersed with content of 20%， within the technical category.关键词：Al Matrix Composites;Defect Analysis;Ultrasonic-electromagnetic Stirring
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发布时间：2024-03-25 - 摘要：Graphene nanosheets modified by ZnO （ZnO@GNS） were synthesized by chemical co-deposition process and added into AZ91D alloy to fabricate the AZ91D-0.1GNS composites. The mechanical properties of composites were investigated， and the microstructure and fracture morphologies of ZnO@GNS were characterized and analyzed by OM， XPS， XRD， SEM and EDS. The results indicate that ZnO@GNS can be effectively coated on surface of GNS， significantly improving the strength， elongation and microhardness of alloys. ZnO modified GNS can significantly refine the grain structure of magnesium alloy， enhancing the bonding quality of strong interface between GNS and magnesium matrix， leading to obvious fine crystal strengthening and stress transfer strengthening关键词：AZ91D Composite;Graphene Nanosheets;Mechanical Properties
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发布时间：2024-03-25 - 摘要：Based on the ［（Zr0.5Cu0.5）0.93Al0.07］97Ta3 （atomic ratio） amorphous composites with multiphase compound structure， the effects of alloying elements on microstructure and mechanical properties were investigated through microalloying of different elements （Ti， Co， Sn）. The results indicate that Sn addition can simultaneously improve the amorphous forming ability of the matrix and thermal stability of B2-CuZr phase，which avoids the occurrence of martensitic transformation of B2-CuZr phase or precipitation of other crystalline phases in the matrix during the solidification process， leading to the multiphase reinforced Cu-Zr based amorphous composites with uniformly dispersed reinforcing phases. The compressive strength and plastic deformation of developed ［（Zr0.5Cu0.5）0.925Al0.07Sn0.005］97Ta3 amorphous composites are increased by 9.6% and 131.3%， respectively， compared with those of ［（Zr0.5Cu0.5）0.93Al0.07］97Ta3.关键词：Amorphous Composites;Microalloying;Multiphase Compound Structure;Strength and Toughness
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发布时间：2024-03-25
Research·Composites
- 摘要：The compound refining of ZL205A alloy with flux （powder）， rotating jet （argon） in different sequences and rotating jet （argon and powder） was carried out， and the purification effects of different gas-powder compound methods were compared and analyzed by hydrogen meter， metallography microscope， tensile testing machine and scanning electron microscope. The results indicate that the flux can increase the interfacial activity between inclusion and melt and reduce the viscosity of aluminum liquid. The combination of flux and rotating jet argon has a great influence on degassing and impurity removal of ZL205A alloy. The optimal purification effect is obtained by rotating jet， where the hydrogen content of melt is decreased from 0.176 mL/（100 g） Al to 0.087 mL/（100 g） Al， and the yield strength， tensile strength and elongation of the alloy are increased by 19.2%， 18.3% and 100%， respectively， compared with those of unrefined alloy.关键词：ZL205A;Rotating Jet;Compound Refining;Hydrogen Content;Mechanical Properties
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发布时间：2024-03-25 - 摘要：The compression test was conducted on Fe-18Ni-12Cr-3Al alloy by Gleeble-3500 thermal simulator in temperature range of 925~1 175 ℃ and strain of 0.01~10 s-1. The true stress-strain curve was analyzed， and the constitutive equation as well as thermal processing map was established. The critical conditions of dynamic recrystallization were investigated by inflection point method based on θ-σ curve. The results indicate that the flow stress of Fe-18Ni-12Cr-3Al alloy is increased significantly with increasing in strain rate and decreasing in deformation temperature. There exits a correlation between the critical stress and peak stress for dynamic recrystallization of the alloy， which is
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发布时间：2024-03-25 - 摘要：The theoretical model of temperature field calculation for ϕ30 mm oxygen-free copper billet was established， and influence of the upward continuous casting parameters on the microstructure of as-cast oxygen-free copper billet was analyzed by CA-FE method. The results indicate that with the constant cooling intensity and temperature， the solidification position of liquid copper inside the mold moves towards the outlet and the cavitation depth is increased with the continuous increase of the drawing speed， leading to the continuous increase of the outlet temperature， while the relation between the drawing speed and outlet temperature meets the quadratic function. When the cooling intensity and drawing speed are constant， the level height of liquid copper in the mold is increased and solidification position moves upward with the increase of casting temperature， while the cavitation depth has little change. The CA-FE simulation results reveal that solidification structure almost consist of a quantity number of coarse columnar crystals under low traction speed with drawing speed as variable， and the columnar grains grow along the drawing direction. With increasing in drawing speed， a fine crystal zone appears on the surface， and the columnar crystals become slender with increasing in amounts， while the angle between columnar crystals and the traction direction is decreased. With the drawing speed increasing to 5.5 mm/s， a small amount of equiaxed crystals appear in the core. With the increase of casting temperature， the quantities， size and growth direction of columnar crystals remain stable with casting temperature as variable， while equiaxed crystals in the core are decreased， which are gradually replaced by columnar crystals.关键词：Oxygen-free Copper;Upward Continuous Casting;CA-FE Method;Drawing Speed;Solidification
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发布时间：2024-03-25 - 摘要：The modified hypereutectic Al-24Si alloy was subjected to solid state diffusion heating and semi-solid heating treatment to promote the homogenization and spheroidization of primary silicon， and the optimal process was determined to improve the properties. The results indicate that the optimal heating parameter of solid state diffusion is 540 ℃ for 12 h， and primary silicon is grown up and become passivated. The optimal parameter for semi-solid heating is 615 ℃ for 15 min， and morphology of primary silicon is significantly improved and spheroidized， where the shape factor can reach above 0.80.关键词：Hypereutectic Al-Si Alloy;Primary Silicon;Solid State Diffusion Heating;Semi-solid Heating;Spheroidize
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发布时间：2024-03-25 - 摘要：The extruded ZK61M magnesium alloy was solid soluted at 450 ℃ for 24 h， and then subjected to 180 ℃ aging treatment for 4~10 h. The corrosion properties of magnesium alloys in extrusion， solution and aging state at different time were investigated by hydrogen evolution method， weight loss method and electrochemical test method. The microstructure， corrosion products and corrosion morphology of the alloy were observed by optical microscope and scanning electron microscope， and phase constituent was analyzed by energy spectrum and XRD. The results indicate that the solution and aging treatment can change the size and distribution of the second phase in the structure of ZK61M magnesium alloy， and then improve the corrosion resistance of the alloy. With the alloy aged for 4 h， the continuous distribution of granular second phase is precipitated at the grain boundary of the alloy， which reduces the corrosion rate and presents the desirable corrosion resistance. With the increase of aging time， the number of the second phase in the alloy is increased， and the uneven distribution of massive and strip precipitates appear， which reduce the corrosion resistance of the alloy.关键词：ZK61M Alloy;Aging Time;Microstructure;Corrosion Resistance
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发布时间：2024-03-25 - 摘要：Aiming at the problem of excessive porosity in the rough casting of a certain type aero-engine double-layer and bidirectional integral guide apparatus， the InteCAST simulation results， fluorescence detection result and SEM detection result were combined to understand the distribution and origination of porosity in the double-layer and bidirectional integral guide apparatus， and the optimization scheme of casting process for porosity was put forward. The results indicate that the optimized process scheme can significantly improve porosity of the guide apparatus， and excessive metallurgy porosity in key parts has been eliminated completely.关键词：Aero-Engine;Double-layer and Bidirectional Integral Guide Apparatus;Porosity;Process Optimization
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发布时间：2024-03-25
Research·Alloy Process
- 摘要：Effects of retrogression temperature and time on microstructure and properties of 7046 aluminum alloy were investigated by means of tensile test， potentiodynamic polarization test and TEM observation. The results indicate that desirable corrosion resistance can be obtained after proper RRA treatment， and the strength is close to that of T6 treated ones. The optimal properties are achieved after pre-aging at 120 ℃ for 24 h， followed by retrogression at 180 ℃ for 15 min and re-aging at 120 ℃ for 24 h， where the tensile strength and yield strength reach 490.3 MPa and 467.8 MPa， respectively， which are higher than those of the T6-treated ones （487.1 MPa and 452.7 MPa）. Moreover， the corrosion resistance is enhanced significantly， where the self-corrosion current density is 8.616×10-7 A/cm2， which is 18.9% of T6-treated specimens.关键词：7046 Aluminum Alloy;Retrogression and Re-aging;Microstructure;Mechanical Properties;Corrosion Resistance
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发布时间：2024-03-25 - 摘要：Effects of heat treatment on microstructure， micro-composition， phase composition and mechanical properties of Mg-12Gd-xY-1Zn-0.6Ti alloy （x=0，0.4，0.8，1.2，%） were analyzed at as-cast， solid solution and aged treatment by X-ray diffractometer （XRD）， scanning electron microscopy （SEM） with energy spectrum and electron tensile testing machine.The results indicate that LPSO phase is present in as-cast Mg-12Gd-xY-1Zn-0.6Ti alloy，which is composed of Mg12Gd5（Zn，Y）. The mechanical properties of alloy with 0.8% Y is desirable，where the tensile strength， yield strength and elongation reach 222 MPa， 149 MPa， and 3.76%， respectively.The mechanical properties of alloy after solution treatment are improved to a certain extent，where the tensile strength， yield strength and elongation reach 272 MPa， 188 MPa， and 5.4%， respectively.The peak aging response of alloy with Y addition is strong， and the mechanical properties of peak-aged Mg-12Gd-0.8Y-1Zn-0.6Ti are desirable，where the tensile strength reach yield strength and elongation are 388 MPa， 267 MPa and 6.44%， respectively.关键词：Mg-Gd-Y-Zn-Ti Alloy;Rare Earth Magnesium Alloys;Heat Treatment;Mechanical Properties
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发布时间：2024-03-25 - 摘要：Different contents of In were added to Sn-0.7Cu-0.1Ni solder， and the effects of In content on microstructure， melting behavior， mechanical property， wetting property and interfacial reaction of the solder alloy were investigated. The results indicate that with the increase of In content， the melting point and microhardness of the solder alloy are decreased， meanwhile the tensile strength is increased， so the wettability is optimized. Meanwhile， the （Cu， Ni）6Sn5 phase layer tends to be thickened.关键词：Sn-Cu-Ni-In Alloy;Melting Behavior;Mechanical Property;Wettability;Interfacial Reaction
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发布时间：2024-03-25 - 摘要：Al-9Si-0.6Fe-0.2Mn-0.2Mg-X （X=0.2Er， 0.4Er， 0.6Er， 0.4Er+1.5Zn， %） alloys were prepared by horizontal die casting machine. The microstructure and mechanical properties of die casting and tensile specimens were investigated by means of metallographic microscope， scanning electron microscope， electron probe and electronic universal material tester. The results indicate that with single addition of 0.4% Er， the modification effect of α-Al and eutectic Si is desirable， where the tensile strength is 228.1 MPa. With compound addition of 0.4%Er + 1.5%Zn， the eutectic Si and α-Al phase become finer and rounder， improving the comprehensive mechanical properties of the alloy， where the tensile strength， elongation and hardness reach 278.2 MPa， 6.3% and 91.9 HV， respectively.关键词：Al-Si Die Casting Alloy;Er;Zn;Microstructure;Mechanical Properties
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发布时间：2024-03-25 - 摘要：The mechanical properties， damping properties， and microstructure characteristics of Al-10Si-1.5Mg-xSn （x=0~6.0%） alloy was investigated， and the variation law of damping and mechanical properties with different Sn content were analyzed. The results indicate that microstructure of the α-Al phase in the alloy is refined with Sn addition， which reacts with Mg to generate Mg2Sn phase， resulting in the reduction of Mg2Si phases. With Sn content of 4.0%， α-Al remains the fined feature， while β-Sn and Mg2Sn are abundant and uniformly distributed. When Sn content further increasing to 6.0%， α-Al、 β-Sn and Mg2Sn are coarsened obviously. With Sn content increasing from 0 to 6.0%， the tensile strength of alloy is gradually decreased from 206 MPa to 169 MPa， and the elongation maintains 2.0%. With the increase of Sn content， the damping properties of alloy are increased firstly and then decreased， reaching a peak at 4.0% Sn. The damping loss factor tanh at 25 ℃/1 Hz， 200 ℃/1 Hz and 25 ℃/40 Hz is 0.038， 0.058 and 0.069， respectively.关键词：Cast Aluminum Alloy;Sn Microalloying;Damping Property;Mechanical Properties
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发布时间：2024-03-25 - 摘要：Taking 3104 aluminum alloy for can body as object， offline inclusion analysis was carried out using PoDFA （Porous Disc Filtration Apparatus）， focusing on the identification of type and content of inclusions at different locations of casting line. The results indicate that for 3104 ingots produced by electrolytic aluminum alloying， the inclusions at the exit of the holding furnace are mainly composed of TiB2 and spinel particles， and the content is high， which is 0.202 mm2/kg. After online degassing， the content of TiB2 and spinel is decreased to 0.129 mm2/kg， however， the overall content remains high with the same inclusion type. After deep-bed filtration， the inclusion is predominately spinel with content further decreased to 0.031 mm2/kg. By properly reducing the temperature of the melt in the holding furnace， prolonging the holding time， and adding CFF before deep-bed filtration， the melt quality of 3104 alloy is effectively enhanced， significantly reducing the rate of broken can during the subsequent punching process.关键词：3104 Alloy for Can Body;Melt Quality;Evaluation;Control
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发布时间：2024-03-25 - 摘要：Al-Si-Cu-Mg hypereutectic piston alloy was prepared by metal mold casting. The volume fraction of heat resistant phase in different alloys was calculated by Thermo-Calc software. The microstructure of alloy was observed by scanning electron microscope （SEM） and transmission electron microscope （TEM）， and the mechanical property test was carried out at 350 ℃. Effects of Ni and Zr contents on microstructure and mechanical properties of cast hypereutectic Al-Si-Cu-Mg piston alloy were investigated， and the relationships between morphology， area percentage of intermetallic compounds and mechanical properties were analyzed. The results indicate that the tensile strength and yield strength of Al-12.5Si-4.0Cu-1.0Mg alloy at 350 ℃ are gradually increased and the elongation is gradually decreased with the increase of Ni content. The amount of Al3Ni and Al3CuNi phases is increased and the morphology is gradually tranformed from fine strip and rod to bulk and cluster， while the percentage of heat-resistant phase area is also increased obviously. With the increase of Zr content， the tensile strength and yield strength of Al-12.5Si-4Cu-1.0Mg-1.5Ni alloy are decreased firstly and then increased， while the elongation is increased gradually. The amount of AlSiNi Zr phase and volume fraction of heat-resistant phase are increased gradually. Al3Zr is precipitated along the aluminum matrix ［001］ axis， and collocated with the aluminum matrix to form a high temperature strengthening phase， improving the high temperature strength of alloy by strengthening aluminum matrix.关键词：Hypereutectic Piston Alloy;Heat-resistant Phase;Microstructure;Mechanical Properties
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发布时间：2024-03-25
Research·Alloy Performance
- 摘要：The numerical simulation of die casting mold filling and solidification process of the rear end cover of an aluminum alloy engine was carried out， and the possible shrinkage cavity and porosity were predicted. The filling and solidification were analyzed， and the cooling channel was optimized. The optimal process parameters were determined by orthogonal test： pouring temperature of 680 ℃， injection velocity of 4 m/s， preheating temperature of 220 ℃.The optimized scheme was used for die casting production and inspection.The test results reveal that the quality of die casting is significantly improved.关键词：Aluminium Alloy;Die-Casting;Numerical Simulation;Orthogonal Test
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发布时间：2024-03-25
Application·Die Casting
- 摘要：In order to master the deformation law and stress distribution during repair welding of titanium alloy castings， the key simulation parameters were proofread firstly based on the combination of simulation analysis and process experiment. The heat input voltage was measured to check double ellipsoid heat source model， and the simulation as well as verification of casting deformation were carried out for the process hole of slide-way sleeve casting under different welding currents. The results indicate that the deformation near the casting process hole presents a downward trend with the welding current of 100， 150 and 200 A， and the deformation is about 0.1 mm. With the increase of welding current， the deformation in the middle arc of casting is gradually increased from 0.08 mm to 0.2 mm， which is consistent with the trend predicted by Sysweld simulation.关键词：Titanium Alloy;Repair Welding;Deformation;Numerical Simulation
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发布时间：2024-03-25
Application·Investment Casting
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