最新刊期
卷 38 ， 期 12 ， 2018
- 摘要：Magnesium alloys were fabricated by centrifugal casting under vacuum-atmosphere protection by Ar2 The composition,microstructure and tensile properties of Mg-7 Al-2 Sn-1 Zn alloys fabricated by centrifugal casting with different rotating speeds were analyzed.The results indicate that the different processes cann’t change the phase compositions of alloys,however,the microstructure of alloy obtained by centrifugal casting can be refined obviously,and further the tensile properties are improved.With the centrifugal speed of 1 800 r/min,the satisfied mechanical properties can be obtained of 175.8 MPa in tensile strength,63.6 MPa in yield strength and 4.98%in elongation,which are attributed to the grain refinement strengthening and solid solution strengthening.关键词：Vacuum;Centrifugal Casting;Mg Alloys
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发布时间：2023-12-18 - 摘要：In order to develop the cerium-containing aluminum alloy material,the Al-Cu-Ce cast aluminum alloy with low cerium content and high cerium content was prepared by squeeze casting process.The effects of Ce and Cu content on the microstructure and mechanical properties of Al-Cu-Ce cast aluminum alloys were investigated.It is found that with the increase of Ce content in the low cerium-containing Al-Cu-Ce aluminum alloy,the tensile properties at ambient temperature and high temperature are decreased,while the casting performance was improved.Ce forms eutectic Al8Cu4Ce phases with Cu,and the quantity of Al2Cu phases is decreased with the increase of the solidus temperature.In the high cerium-containing Al-Cu-Ce aluminum alloy,Ce forms eutectic Al8Cu4Ce phases and primary Al8Cu4Ce phases with Cu.The primary Al8Cu4Ce phases are segregated due to high density.When the content of Cu and Ce is 14%and 5%,the tensile properties of the alloy at ambient temperature and high temperature present desirable,where the tensile strength and elongation reach 368MPa,3.0%at ambient temperature,while 78MPa,19%at 350℃,respectively.关键词：Al-Cu-Ce Aluminum Alloy;Al2Cu Phase;Al8Cu4Ce phase;Segregation
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发布时间：2023-12-18 - 摘要：In order to understand the influence of coating transfer technology and formula on the performance of the transfer coating,the neural network was used to simulate the coating formula,the relationship model of the coating transfer process and the performance of the composite coating.Besides,the model was verified by the test data.The results reveal that the maximum relative error of the coating hardness,the wear rate,the shear strength reach 6.19%,9.52%and 6.45%,respectively.The BP neural network model can well simulate the internal relationship between coating transfer process,formulation and hardness,wear resistance and shear strength of transfer coating,and it is effective to the analysis and simulation of the coating transfer process.关键词：Coating Transfer Process;Composite Coating;Neural Network;Process Simulation
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发布时间：2023-12-18 - 摘要：The as-extruded Mg-11 Li-3 Al-xZr（x=0,0.1）alloy was treated by solid solution at different temperatures.The microstructure and mechanical properties of the alloys after solid solution treatments were investigated by OM,XRD,SEM,hardness and tensile test.The results reveal that the as-extruded Mg-11 Li-3 Al alloy is mainly composed ofβ-Li phase,α-Mg phase,θ-MgLi2 Al phase and AlLi phase,and these phases are redissolved in theβ-Li matrix after solid solution treatment at 450℃,and the grain size is coarsened.The Mg-11 Li-3 Al-0.1 Zr alloy is mainly also composed ofβ-Li phase,α-Mg phase,θ-MgLi2 Al phase,AlLi phase with absence of new phase generation,and theβ-Li single-phase alloy can be generated by solid solution treatment also at 450℃,meanwhile,the grain size cann’t be changed obviously,however,the thermodynamic stability is improved.With the increase of solution temperature,the hardness of as-extruded Mg-11 Li-3 Al-xZralloy（x=0,0.1）is increased,and reaches the peak value at 400～450℃.Meanwhile,the yield strength and tensile strength of the alloy are increased significantly,while the elongation is decreased.关键词：Mg-Li Alloy;Solid Solution Treatment;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The numerical simulation of the temperature field of an aluminum alloy die casting die was carried out,and the simulated results of the temperature field were considered as the initial thermal loading to simulate the stress field of the die.Due to the different forces in process of the die-casting,the simulated results are divided into four stages.The prediction of die life was carried out by combining the simulated results with local strain analysis as well as four points method,which provided reference for determining process parameters and improving die life.关键词：Die Casting Die;Local Strain Method;Thermo Mechanical Coupling;Life Estimation
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发布时间：2023-12-18 - 摘要：Copper alloy is considered as the widely used materials in the mintage.Following the rapid development of the economical society and the color of mintage were becoming higher and higher.Study and development of copper alloys were becoming more and more widely,including circulation coin,commemorative coin,signet and so on.CIELAB uniform color space was used to describe the color of alloy.The common copper alloys coin at home and abroad were summarized.The formation mechanism and influencing factors of the surface color of the mintage alloy were analyzed,and the design principles and research summaries of copper alloys with different color coinage were analyzed.The future development direction of the copper alloy was expounded.关键词：Mintage Copper Alloy;Color;Anti Discoloration
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发布时间：2023-12-18 - 摘要：The interface bonding mechanism of bimetallic clad pipes was reviewed,and main preparation processes of bimetallic clad pipes at home and abroad were described systematically.According to the difference in the physical state of the substrate and cladding metal at the initial stage,the existing preparation processes are divided into four categories:solid-solid bonding method,solid-liquid bonding method,liquid-liquid bonding method and other bonding method.The forming principles and main characteristics of various preparation processes were analyzed comparatively.Finally,the prospects for the major issues that would be faced in the industrialization of bimetallic clad pipes were forecasted combined with the development status and future industrial application requirements.关键词：Bimetallic Clad Pipe;Solid-solid Bonding;Solid-liquid Bonding;Liquid-liquid Bonding
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发布时间：2023-12-18 - 摘要：A certain amount of alloying elements and impurity elements are often added or accumulated in the process of production,use,recovery and regeneration of cast Al-Si alloy.Some trace elements（Ca,B,Bi,Sb,RE,etc.）often react with Sr to form complex intermetallic compounds,reducing the content of Sr and decreasing the modification effect of Sr.When strontium is added to different alloys,it is necessary to neutralize the poisoning effect of trace elements on the Sr modification behavior.As long as the content of strontium is high enough,it can still produce well modification effect.关键词：Al-Si Alloys;Modification;Poisoning Effect;Impurity Elements
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发布时间：2023-12-18 - 摘要：A three dimensional cellular automaton-finite element model was developed to predict the solidification grain structures of DZ445 superalloy Ni-based single crystal,in which Gaussian distribution continuous nucleation model was adopted to describe the nucleation and the KGT model was extended to multi-component alloys to account for the growth kinetics of dendrite tip.Effects of slope angle and withdrawal rate on directional solidified microstructure evolution were investigated.The results reveal that slope wax-pattern can eliminate the stray grain formed at platform,however probably form new stray grain at other location.With increasing in the withdrawal rate,more stray grains are formed at platform.However sectional variable withdraw rate can eliminate the platform stray grain.Inaddition,the distance from airfoil where start change withdraw rate to platform should be keep a certain number,and which is determined through the size of blade and withdraw rate.关键词：CAF;Ni-base Superalloy;Single Crystal Blade;Grain Structure
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发布时间：2023-12-18 - 摘要：The structural characteristics of the aluminum alloy combined shell castings were analyzed,and the different casting process schemes were simulated with the help of casting simulation software.According to the distribution of solidification temperature field and the probability defect distribution based on the residual melt modulus method,the optimal casting process scheme was carried out.The actual production indicates that the trial production of the product is successful,and the development cycle is shortened effectively.关键词：Permanent Casting;Simulation Analysis;Tilt Pouring
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发布时间：2023-12-18 - 摘要：Due to the weight loss requirements of new energy vehicles,the battery shell is usually made of die casting aluminum alloy with light weight,easy to process,high temperature and corrosion resistance,good heat transfer and electrical conductivity.The die casting battery housing requires high technological parameters,and the clamping force of the die casting machine is too large,so there exist many problems in the process of die casting.MAGMA analysis was used to understand the defect formation in die casting process,and corresponding measures were used to solve the problems,which provided reference for the development of structural parts of new energy vehicles.关键词：Battery Housing;Aluminum Alloy Die Casting;CAE Simulation Analysis
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发布时间：2023-12-18 - 摘要：Interfacial heat transfer coefficient（IHTC）between ZL114Aaluminum alloy and resin sand was obtained by a inverse heat conduction problem（IHCP）method during the low pressure sand casting process of a typical plate shape casting,and the relationship between IHTC and temperature was analyzed.The results indicate that IHTC remains at an approximately constant of 335W·m-2K-1 when temperature is above liquidus value.Then the IHTC is decreased rapidly as the temperature is inclined to530～570℃.Finally,when the temperature is less than 530℃,the IHTC is decreased gradually to an approximately value of 60W·m-2K-1.The empirical equation of IHTC as a function of temperature was established by non-linear fiting.The reversely calculated IHTC was applied to the temperature calculation of the casting with ProCAST software.The results reveal that the calculated temperature agrees well with the experimental temperature with the maximum deviation less than 12℃.关键词：Interfacial Heat Transfer Coefficient;Low Pressure Sand Casting;Inverse Estimation Method
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发布时间：2023-12-18 - 摘要：10 SiCp/A356 composites were fabricated by stirring casting and direct squeeze casting process under applied pressures of 0.1（gravity）,50,75 and 100 MPa.The effects of the squeeze pressures on the friction and wear behavior of the composites were investigated by the wear test with HT250.The results show that under the as-cast and T6-threated condition,as the applied pressures increase,the porosity is decreased,while the density and hardness are increased.The wear rate of the composites is decreased and the friction coefficient is increased.The applied pressures can improve effectively the interface bonding strength between the particles and matrix.With the squeeze pressures of 100 MPa,the SiC particles can be broken off and the wear mechanism is characterized by abrasive wear.关键词：Squeeze Casting;Metal Matrix Composites;Friction and Wear;Wear Mechanism
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发布时间：2023-12-18 - 摘要：The die casting process of ES11ZD pump shell was designed and optimized by Flow-3 Daccording to its structure.The results reveal that in initial design,metal liquid is not effort to filling the gating system fully in early filling process,and the filling process presents un-steady with apparent splashing,so the pump shell exists in the serious air-entrapment and surface defects.Through adjusting runner shape,overflow slot dimension and shape,the optimized design was simulated.The results reveal that the defects can be eliminated greatly.关键词：ES11ZD Pump Shell;Die Casting;FLOW-3D;Process Optimization
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发布时间：2023-12-18 - 摘要：In order to solve the problem that the 3D printing model replaces the wax model in the molten mold casting to result in the large expansion and fracture rate of the mold shell during investment casting,a kind of internal collapse melting mold structure based on the thermal property difference of materials was proposed.Taking the complex blade parts as an example,the internal collapse structure was embedded into the blade structure,and the sample was printed through 3D printing and the subsequent process design was combined with the subsequent dewaxing process.The results show that the compressive strength of the blade with internal collapse structure is significantly higher than that of the hollow structure,and the crushing rate of the shell with internal collapse structure is decreased significantly in the subsequent dewaxing process.关键词：Blade;Internal Collapse;3D Printing;Investment Casting
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发布时间：2023-12-18 - 摘要：By comparing the microstructure and mechanical properties of gypsum mold precision castings with different process conditions,the effects of the shrinkage porosity defects on mechanical properties of thin-wall plate samples of ZL114 Aalloy were investigated.The results reveal that the oxidation inclusions or the oxide bifilms in the melt are related with the nucleation of shrinkage,while the solidification mode of melt affects the growth of shrinkage.For Sr-modified melt,because of more oxidation inclusions or oxide films engulfed in the melt and characteristics of gypsum mold and alloy inherent behavior（easy to form paste solidification）,pressure solidification is difficult to eliminate porosity defects,so the cleaning treatment of aluminum liquid is particularly critical.For the unmodified melt,due to the reduction of the modifying process of the melt,the less oxidation inclusions or oxide films in the melt and characteristics of alloy inherent behavior（easy to form progressive solidification）,the shrinkage defects in the samples are decreased significantly.However,because of the influence of acicular eutectic Si,the mechanical properties of the specimen need to be improved.关键词：ZL101A Alloy;Gypsum Mold Precision Casting;Thin-walled Plate Samples;Porosity
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发布时间：2023-12-18 - 摘要：Aiming at the noise contained in temperature data collected by the thermocouple embedded in the slab continuous casting mold,which seriously affects the accurate evalution of the surface quality of the slab by the steel leakage prediction system,the Fourier transform and wavelet transform noise reduction methods were used to denoise the temperature data collected in the slab continuous casting field.The denoising results were analyzed comparatively.It is found that the wavelet transform has the better denoising effect on the temperature data,which can provide more accurate data for the breakout prediction system in the continuous casting process.关键词：Slab Continuous Casting;Breakout Prediction;Noise Reduction;Wavelet Transform
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发布时间：2023-12-18 - 摘要：Nodular cast-iron pipe was produced by EPC technology with gradually simplified gating system,obtaining the satisfied effects.The extreme-simplified gating system has the advantages of rapid filling,rational thermal distribution and high production yield rate as well as the simplify operation.Taking some cases,application of extreme-simplified gating system in EPC pipe was described.关键词：EPC;Extreme-simplified Gating System;Nodular Cast-Iron Pipe
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发布时间：2023-12-18 - 摘要：Graphene oxide colloid was prepared by the modified Hummer method.In combination with cryomilling and hot pressing sintering,graphene/7075 Al composites with 0.75%and 1%graphene content were prepared successfully.The microstructure,mechanical properties and fracture morphology of the graphene/7075 Al composites were investigated by scanning electron microscope（SEM）,vickers hardness tester and static tensile tests,respectively.The results reveal that compared with 1%graphene composite,the graphene nanocrystal of 0.75% graphene composite is completely coated with aluminum matrix,and there is no lamellar graphene agglomeration.The hardness of composites with 0.75% and1% graphene content is increased from 90 HV（no addition of graphene 7075 Al）to 125 HV and 140 HV,respectively.Both the tensile strength and elongation of the composites are increased firstly and then decreased,and the highest tensile strength value reaches 250.71 MPa and the maximum elogation value reaches 6.18%.Because the amount of graphene addition is less,the density of the composites is changed slightly.关键词：Graphene/7075Al Composite;Microstructure;Properties;Hot-pressing Sintering
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发布时间：2023-12-18 - 摘要：A356/2024 bimetal composites were prepared by pouring liquid A356 alloy on solid 2024 Al alloy substrate under liquid-solid rolling cast process.The effects of Zn intermediate layer and pouring temperature on microstructure and mechanical properties of A356/2024 bimetal composites were investigated,and interface shearing strength and hardness distribution of the composites were analyzed.The experimental results indicate that the aluminum alloy surface after Zn treatment can effectively remove the oxide film on the surface of the 2024 aluminum alloy substrate and form the Zn coating to avoid the re-oxidation.The shearing strength of the bimetal composites is improved by about 40%from 100 MPa to 141 MPa compared with that of ones by un-plating Zn bimetal composites when pouring temperature is 700℃,which is beneficial to utilize the Zn intermediate layer as a protective film and to improve the wettability during high pouring temperature.When pouring temperature is 700℃,due to the existence of the Zn intermediate layer,the hardness peak of the Zn pretreated composites will appear on the side of the 2024 aluminum alloy substrate compared with the Zn untreated composites,and the wider melting zone will be formed on the surface of 2024 alloy substrate and more hardened phase will be generated.关键词：Bimetal Composites;Zn Intermediate Layer;Pouring Temperature;Liquid-solid Rolling Cast
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发布时间：2023-12-18 - 摘要：The SiCp/Sn/Al composites fabricated by powder metallurgy were treated by hot extrusion deformation.The effects of composition on microstructure,hardness and ambient compression performance of SiCp/Sn/Al composites were investigated.The results reveal that hot extrusion can improve interfacial bonding strength and compactness of the composites to refine grain size.In addition,hot extrusion can increase the hardness of the composites.SiCpcan increase greatly material hardness,while Sn can weaken the hardness.Hot extrusion can increase the peak stress of ambient compression of the composites.With increasing in SiC content,the peak stress is increased gradually.The ambient compressive curves are characterized by the peak value then be stable.Sn can decrease the flow stress of the composites,however,with increasing in Sn content,the decrease effect can be ignored.关键词：Powder Metallurgy;SiCp/Sn/Al Composites;Hot Extrusion;Room Temperature Compression
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发布时间：2023-12-18 - 摘要：The Gleeble-3500thermal simulator was used to investigate the high temperature flow stress and microstructure of Ti-22Al-24Nb alloy at 900～1 110℃and 0.01～10s-1.The effects of strain rate and deformation temperature on the flow stress and microstructure of Ti-22Al-24Nb alloy were analyzed.The results indicate that the deformation temperature and strain rate have a significant effect on the high temperature flow stress of Ti-22Al-24Nb alloy.The flow stress is decreased with the increase of deformation temperature and increased with the increase of strain rate.When the deformation is performed at a high strain rate（6）ε≥1.0s-1)in theα2+B2two-phase region,local microstructure plastic flow and adiabatic shear occur in the microstructure of the alloy.In the B2single-phase region,when the deformation is carried out at a low strain rate（6）ε≤0.1s-1),there exists obvious dynamic recrystallization grains.At high strain rates,the original B2 phase grains are significantly elongated and the grain boundaries are mostly discontinuous.Under the condition of low strain rate（6）ε≤0.1s-1),the dynamic recrystallization occurs more easily with the increase of deformation temperature.With the deformation temperature higher than 990℃,apparent dynamic recrystallization characteristics begin to appear.Under the high strain rate（6）ε≥1.0s-1),the grain boundary is blurred,and with the decrease of the deformation temperature,the grain boundary almost disappears,so the alloy is prone to local plastic flow and adiabatic shearing.关键词：Ti-22Al-24Nb Alloy;Hot Deformation Behavior;Local Plastic Flow;Adiabatic Shear;Dynamic Recrystallization
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发布时间：2023-12-18 - 摘要：The refining behavior and heterogeneous nucleating behavior of Al-30 Si-5 C master alloy on primary Si in Al-18 Si alloys were described.The results show that the mechanical stirring can accelerate the refining effect of Al-30 Si-5 Cmaster alloy on primary Si and a shorter holding time is also a promotion factor.The average size of primary Si grains can be decreased from 108μm to 35μm with 1% Al-SiC master alloy addition by applying mechanical stirring and holding temperature for 15 min.The EDS and DSC analysis indicates that SiC particles can act as the heterogeneous nucleation substrate of primary Si.Besides,the refining mechanism was discussed from the following aspects:（1）the basically appropriate crystallographic orientation relationship between Si phase and SiC phase,（2）adsorption and segregation of Si element on SiC particles enabled the rich Si layer to satisfy the nucleation supercooling degree,（3）surface morphology of SiC particles favorable for nucleation of embryos.关键词：Hypereutectic Al-Si Alloy;Primary Si;Refinement;SiC
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发布时间：2023-12-18 - 摘要：Machinery Multi-Grinding of the surface（MMGS）device was used to perform two passes of plastic deformation on the plate of 2024 Al alloys,and XRD,the mechanical property test,TEM and HRTEM of the grinned material were performed.The results show that MMGS is an effective plastic deformation method for the commercial 2024 aluminum alloys.Yield strength of the grinned samples can reach 475 MPa and the elongation can reach 15%,which are attributed to a large amount of dislocations and grains refinement inside the sample.The MMGS samples and the T351 state samples are analyzed using the work hardening rate.The work hardening rate of the T351 state samples is much higher than that of the MMGS samples in a large range of the whole strain after the ture strain more than 0.018,besides the cracks are generated when the coarse S phase were suffered the strong plastic deformation,which ultimately leads to the elongation of the MMGS samples slightly lower than that of the T351 state samples.关键词：MMGS;2024 Al Alloys;Graded Structure;Micro Nano Crystallization
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发布时间：2023-12-18 - 摘要：Adopting copper mould spray casting combining with isothermal heat treatment,the existing form of rare earth Ce in AZ91magnesium alloy with different cooling rate and its evolution behavior during solid solution treatment were analyzed.The influences of Ce on microstructure refinement and thermal stability of rapid cooled magnesium alloy were analyzed.The results show that Ce is enriched ahead of the solidification interface,which suppresses the grain growth and promotes nucleation.Consequently,grain refinement is achieved in magnesium alloy.However,accicular Al11Ce3phase can be generated in the higher Ce content alloy,which reduces constitutional undercooling and harmful to refinement.Due to the increase of undercooling and the relief of inhibition effect of nucleation by latent heat,the grain refinement of spray casted alloy presents remarkable,and formation of the accicular rare earth phase can be avoided effectively by formation of supersaturated solid solution.After solid solution treatment at 420℃,the precipitation of fine granular Mg12Ce compounds can inhibit the grain growth at high temperature,which improves the thermal stability of fine grain structure in rapidly cooled magnesium alloys.关键词：Magnesium Alloys;Non-equilibrium Solidification;Grain Refinement;Thermal Stability
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发布时间：2023-12-18 - 摘要：The bauxite-based castable and andalusite-based castable were prepared with bauxite,mullite,andalusite,SiO2 micropowder,α-alumina micropowder and calcium aluminate cement as main raw materials.The specimens were heat treated at 110℃for 24 hand 1 550 ℃for 3 h,respectively,and some properties of the materials,such as permanent linear change rate,density,mod
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发布时间：2023-12-18 - 摘要：The ferritic-based ductile iron was subjected to friction stir processing（FSP）.The effects of FSP on the microstructure evolution and erosion wear angle on the erosion wear resistance of ferriticbased ductile iron were investigated by hardness tester,SEM,EPMA,XRD and erosion wear tester.The results reveal that graphites in the TMAZ of the FSP ductile iron are elongated by stirring,and graphites in the other regions maintain a spherical morphology.As the distance from the FSP surface increases,the content of martensite and retained austenite in the matrix is decreased,and the hardness correspondingly become lower.The martensite and retained austenite in the HAZ are formed around the graphite,and the rest area is ferrite.The FB ductile iron has an increased erosion wear resistance as the erosion wear angle increases.The erosion wear rate curve of FSP ductile iron presents bimodal,and the erosion wear resistance under the erosion angle of 20°and 45°is better.When the erosion angle is less than 50°,the erosion wear resistance of FSP ductile iron is better than that of FB ductile iron;on the contrary,the erosion wear resistance of FB ductile iron is better than that of FSP ductile iron.关键词：Ductile Iron;Friction Stir Processing;Erosion Wear Rate;Retained Austenite
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发布时间：2023-12-18 - 摘要：It is found that the C19400 ingots produced under different casting conditions have different results during hot rolling under the same heating system.The ingots produced by different casting processes were measured for various indexes,and the test results were compared.Combined with theoretical analysis,it is concluded that different casting processes result in metallographic phase,high-temperature performance and stress difference of the ingot,which directly affects the hot rolling quality.关键词：C19400;Cast Process;Hot-rolling
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发布时间：2023-12-18 - 摘要：Copper based alloy was cryogenic treated at 800℃for 30 min and immersed liquid nitrogen for30 min,and effects of cryogenic treatment on thermal physical properties of copper based alloy were investigated.The results show that the cryogenic treatment can increase the thermal diffusivity coefficient,thermal conductivity and thermal expansion coefficients of the copper based alloy,and their reach0.339 3 cm2·s-1,124.97 W·m-1·K-1 and 0.545 4×10-5℃-1,increased by 0.028 1 cm2·s-1,10.54 W·m-1·K-1 and 0.232 1×10-5℃-1,respectively,compared with those of ones without cryogenic treatment at room temperature.关键词：Copper Based Alloy;Cryogenic Treatment;Thermal Diffusivity Coefficient;Thermal Conductivity;Thermal Expansion Coefficients
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发布时间：2023-12-18 - 摘要：Cu-20 Pb hypomonotectic alloys were prepared under different strong pulse currents,and the structure and phase composition,microhardness and anti-friction properties of hypomonotectic alloy were analyzed.The results reveal that Cu-20 Pb hypomonotectic alloys are mainly composed of matrixα-Cu and Pb phase in matrixα-Cu.When the pulse peak current is 0,the hypomonotectic alloys’ dendrite is sparse with large crystal grain size and less uniformity,while the peak current is 1 500 A,the grain size of the alloy reaches the smallest with good uniformity,meanwhile,average hardness reaches 58.04 HV0.49,increased by 28.58%compared with that of ones with 0 peak current.When the peak current is in the range of 0～1 500 A,with increasing in current,the grain size is decreased while average hardness is increased.However,with peak current increased from 1 500 Ato 2 000 A,grain size is increased while hardness is decreased.Friction and wear experiments reveal that the hypomonotectic alloy presents a satisfied friction performance with the pulse peak current of 1 500 A.关键词：Strong Pulse Current Field;Cu-20Pb Hypomonotectic Alloy;Microstructure;Microhardness;Anti-friction Performance
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发布时间：2023-12-18 -
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