最新刊期
卷 38 ， 期 6 ， 2018
- 摘要：The TiC/Ni functionally gradient coating on H13 steel surface was prepared by self-propagating high temperature synthesis and pseudo hot isostatic pressing（SHS/PHIP）.TiC/Ni functionally gradient coatings were measured in melted aluminum for 0.5 hand 2 hstatic erosion test at 700 ℃.The coating phases after erosion were analyzed by XRD,and the microstructure and composition of the coatings were observed by SEM-EDS.The results show that the main phase of the coating is composed of TiC,Ni,TiO2 and AlNi3.The surface failure of coating is attributed to the corroded Ni binder phase and the oxidized TiC framework.The subsurface failure of coating is mainly caused by the erosion of Ni binder phase,while the TiC framework remains the original structure.The erosion resistance of TiC is better than that of Ni binder phase.关键词：SHS/PHIP;TiC/Ni;Functionally Gradient Coating;Erosion
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发布时间：2023-12-18 - 摘要：The effects of different Nb content（0,0.3%,0.5%,1%）on microstructure of Cr20 Ni80 electrothermal alloy were analyzed by optical microscope（OM）and electron probe microanalyzer（EPMA）.Tensile properties,microstructure and fracture mechanism of the Cr20Ni80 alloy with different Nb contents were analyzed by tensile testing machine and scanning electron microscope（SEM）.The results show that the equiaxed grains in the Cr20Ni80 alloy are increased with the addition of Nb element,and the dendritic structure is refined with Nb element enriched around the grain boundary.Fracture morphology of the alloy is characterized by plastic fracture at room temperature,and tensile strength and yield strength are increased from 515 MPa and 265 MPa to 572 MPa and 346 MPa with the Nb content increased from 0 to 1%,while elongation of the alloy is decreased from 56.5%to 49%.It is shown that Nb has an negative effect on the room temperature plasticity of the alloy.关键词：Cr20Ni80 Alloy;Nb Microalloying;Ambient Mechanical Properties
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发布时间：2023-12-18 - 摘要：Effects of microalloying on thermal conductivity and mechanical properties of Mg alloys were investigated.The results show that the Zn,Sn elements exist mainly in Mg matrix in form of solid solution,which plays a role of solution strengthening.Meanwhile,the Zr,Ca,La,Ce elements are enriched in the grain boundary,and the small number of second phases formed can refine the grain size.The trace alloy element addition can improve obviously the strength and elongation of Mg alloys.Meanwhile,they have the slight effects on electrical and thermal conductivity of Mg alloys.关键词：Microalloying;Mg Alloys;Mechanical Properties;Thermal Conductivity;Electrical Conductivity
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发布时间：2023-12-18 - 摘要：Microstructure evolution of 310 Sstainless steel with different Al content was observed by XRD、OM、EPMA and SEM,and mechanical properties were measured by tensile tests.The results reveal that the enrichment of Cr and C element is more serious with the increase of Al content at the cast state,however,the Cr element and carbide are dissolved during solution treatment.In addition,the volume fraction of the ferrite is increased with the increase of Al content,and the ferrite volume fraction of solid-solution 310 Sis higher than that of the cast state ones with the same Al content.When the Al content in the 310 Sis 2%,the steel has a desirable combination of strength and ductility.And the strength of solid-solution state is higher than that of the cast state,while the elongation is decreased slightly.关键词：310S Stainless Steel;Al Content;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Effects of homogenization treatment on precipitated phase in 3003 alloy with high Mn and microstructure as well as mechanical properties of the composite plates were investigated by electrical conductivity measurement,tensile test,metallographic observation and SEM analysis.The results show that the grain size in composite plate is mainly controlled by the combination role of size and density of the precipitated phase,and the inhibition effect of quantity density on recrystallization is the greater than that of size.With the increase of the heating rate of homogenization,the precipitated phase can’t be precipitated by the nucleation,so the number of precipitates is decreased and the size is coarsened.At 200℃/h,the grain size reaches the smallest value and yield strength reaches 71.8 MPa.With the increase of homogenization temperature,the solid solubility of Mn is increased,and the fine precipitates are redissolved,resulting in the decrease of density of precipitates,and increase first and then decrease of the size.At 600 ℃,the yield strength is 64.2 MPa.In addition,the yield strength of the composite plate is decreased after brazing.关键词：3003 Aluminum Alloy;Homogenization;Precipitate Phase;Recrystallization;Brazing
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发布时间：2023-12-18 - 摘要：By high energy ball milling and vacuum hot-press sintering method,the Mg-Zn alloys with four different zinc contents were prepared.Through testing potential polarization curve in SBF simulated body fluid and weight loss for 24h,the corrosion resistance of four Mg-Zn alloy was analyzed.The results show that the second phase Mg2Zn3,MgZn2 can be observed in ball milled powder and sintered alloy ingot,and with increasing in the content of zinc,the second phase is increased.Weight loss of Mg-5Zn and Mg-10Zn is the higher than that of Mg-1Zn and Mg-3Zn alloy,which is related closely with the second phase Mg2Zn3,MgZn2.Zinc element in corrosion liquid can form a certain amount of ZnO passivation film,which can protect the matrix together with the Mg（OH）2.Mg-3Zn alloy presents the desirable corrosion resistance in the four Mg-Zn alloys.关键词：Mg-Zn Alloy;Simulated Body Fluids;Corrosion Resistance;Mechanical Alloying
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发布时间：2023-12-18 - 摘要：The effects of squeeze casting on microstructure and mechanical properties of the A356.2 alloy were investigated by observing the number of pores,the size and morphology of eutectic silicon particles and evolution of second phases under different heat treatment conditions.The results show that elongation of the alloy is mainly related to the porosity and the spheroidizing effect of eutectic silicon particles.With the decrease of the porosity and the increase of shape factor of the eutectic silicon particles,the elongation is increased,in which the porosity of the alloy is the dominant factor.The yield strength and the tensile strength of the A356.2 alloy are mainly related to the size of Mg2 Si phase,and the strengthening effect is weakened when the size of Mg2 Si phase is increased.关键词：A356.2 Alloy;Squeeze Casting;Porosity;Eutectic Silicon;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Au-20 Sn solder ribbon was prepared by single-roller rapid solidification technology.The effects of annealing process on microstructure and properties of rapidly solidified Au-20 Sn solder alloy were characterized by FESEM,EPMA and EDS.The results show that the single-roller rapidly solidified Au-20 Sn solder alloy consists of a small amount of primaryζ′-Au5 Sn dendrites and eutectic structure（ζ′-Au5 Sn+δ-AuSn）,and the microstructure is refined.During the annealing treatment,theδ-AuSn phase grows gradually because Sn element is diffused into theδ-AuSn phase from theζ′-Au5 Sn phase.Based on considering the microstructure,composition distribution and toughness,the annealing process is determined to be at 240 ℃for 4 h.关键词：Au-20Sn Solder;Single-roller Rapid Solidification;Annealing;Microstructure and Properties
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发布时间：2023-12-18 - 摘要：High strength aluminum alloys are key materials for rheoforming to realize"replacing forging by casting".Rheoforming is an available processing technology for high strength aluminum alloys to produce complex shape components.However,high strength aluminum alloys used in rheoforming are standard alloys.For these alloys,there are high contradictions between rheoformability and potential of heat treatment,and between strength and ductility of rheoformed components.The present review introduced and discussed three key scientific problems including semi-solid slurry preparation,alloy design and characteristic microstructures controlling.关键词：High Strength Aluminum Alloys;Rheoforming;Mechanical Properties;Alloy Compositions
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发布时间：2023-12-18 - 摘要：Based on the software Magma5.3,low pressure die casting simulations was carried out on the local defects of a lower cylinder blocks.The origination of defects was described and the simulated results were optimized by DOE Taguchi method.The results show that the optimization of cooling parameter and the structure of ingates can improve greatly defects.The defective rate was decreased by 98%.关键词：Magma Software;Simulation;Defects;Low-pressure Die Casting;DOE
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发布时间：2023-12-18 - 摘要：According to the structural characteristics and quality requirments of the pump shell,the design of die casting process for the pump shell was carried out.The numerical simulation of the filling and solidification process of the initial design was carried out by using Flow-3 Dsoftware,and the position and cause of the shrinkage defects were analyzed.Aiming at these problems,the method of enlarging the ingate and adding the overflow slot at the defective position was adopted,and the optimization scheme was designed.The simulation results show that the optimized process can reduce significantly the entrapped-gas in the castings and improve the casting quality to meet the requirements.关键词：Die Casting Process;Pump Shell;Numerical Simulation
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发布时间：2023-12-18 - 摘要：For solving the problems existing in Al alloy housing,the die casting process was simulated using ProCAST software.The temperature field of Al alloy was analyzed and the position of shrinkage cavities and porosity was predicted.Two kinds of schemes for optimizing casting temperature field by cooling water were put forward.The temperatures field of two kinds of schemes was analyzed comparatively for obtaining the optimized scheme.The internal shrinkage cavities and porosity in housing fabricated by the optimized scheme were eliminated completely with the optimized scheme.关键词：Die Casting;Numerical Simulation;Temperature Field Optimization;Shrinkage Cavities and Porosity
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发布时间：2023-12-18 - 摘要：The die casting process was designed on the basis of analyzing the structural characteristics of the shock tower,and then the flow and filling process of the molten Al alloy were simulated by using simulation software.The results show that the filling of Al alloy melt presents stable in the mold cavity,and the molten metal containing inclusion and large volume of gas at the front enters the overflow launder,avoiding the defects caused by engulfing gases inside the castings.In addition,the rapid cooling method was applied to eliminate the shrinkage defects of the local thick parts,and finally the shock tower with good quality was produced.关键词：Die Casting;Al Alloy;Simulation;Shock Tower
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发布时间：2023-12-18 - 摘要：The 2 A12 aluminum alloy shell was produced by squeeze casting process,and the key points of the design of shells and mould were described.The key point of the process is to realize the liquid metal smoothly filling,so specific pressure,mould preheating temperature and other process parameters were adjusted.The results show that with the mould preheating temperature of 350 ℃,the pouring temperature of 690700 ℃and the pressing speed of 10 mm/s as well as the dwelling time of 10 s,the size and performance of squeezing castings meet the design requirements.关键词：2A12 Aluminum Alloy;Shell Hood;Squeeze Casting;Mould Design
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发布时间：2023-12-18 - 摘要：The lost foam casting（LFC）liquid-liquid compound process was used to prepare the Al/Mg bimetallic castings by placing pure Al interlayer between AZ91Dand ZL101A.The microstructure and composition of the interface layer were analyzed by scanning electron microscopy（SEM）,energy dispersive spectroscopy（EDS）and X-ray diffractometer（XRD）.The results reveal that the pure Al interlayer can prevent successfully the liquid alloys mixing before it is melted,and then the melted interlayer presents metallurgical reaction with the liquid alloys,so AZ91Drealizes a desirable metallurgical bonding with ZL101Aand generates uniform reaction layers.The reaction layer near AZ91Dconsists of Mg17Al12andδ-Mg eutectic phase,while the reaction layer near ZL101Ais composed of continuously distributed Al3Mg2phase and granular Mg2Si phase.关键词：Al/Mg Bimetallic Alloys;Lost Foam Casting;Liquid-Liquid Compound;Interface Characteristics;Metallurgical Bonding
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发布时间：2023-12-18 - 摘要：Aiming at the characteristics of 0Cr17Ni4Cu4Nb precipitated hardening stainless impeller,the structure of mould was optimized to insure the yield rate.Mould structure was designed with the help of the SolidWorks software.The stainless steel impeller was manufactured by the sol silicate investment casting,meeting the customer requirements and saving casting cost as well as decreasing post-processing cost.关键词：Precipitated Hardening Stainless Steel;Impeller;Investment Casting
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发布时间：2023-12-18 - 摘要：The short cut composite fiber in gypsum slurry was dispersed by ball milling and mechanical stirring.The influence of the composite fibers content on dispersion of gypsum fiber and gypsum slurry was investigated,and its micro-mechanism was described.The results show that under the same ball milling conditions,the dispersion effect of fiber in gypsum slurry is obviously changed with the increase of fiber content.As the fiber content in the range of 01.25%,it is found that with the fiber content less than 0.5%,the fiber dispersion presents desirable with absence of agglomeration and tangles,while more than 0.5%,the fiber dispersion in the gypsum becomes worse with occurrence of agglomeration and tangles of fiber bundles.关键词：Ball Milling;Mechanical Stirring;Gypsum Slurry;Composite Fiber;Dispersion
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发布时间：2023-12-18 - 摘要：The origination and countermeasures of common defects,such as gas hole,segregation and shrinkage porosities（holes）,in tin bronze were described.Defects in large horizontal centrifugal casting ZCuSn5 Pb5 Zn5 tin bronze sleeve were analyzed with the help of SEM and EDS.Meanwhile,countermeasures were provided based on alloy melting and centrifugal casting parameters.The results reveal that through increasing homogeneity and purity of liquid tin bronze and modifying centrifugal casting parameters and adopting water cooling system,the yield rate of tin bronze sleeve are increased to 90%.关键词：Tin Bronze;Horizontal Centrifugal Casting;Large Sleeve;Defect
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发布时间：2023-12-18 - 摘要：CPR1000 primary pump shell was manufactured with austenite duplex stainless steel contained12%to 20%ferrite by sand casting.The self-hardening sand was adopted to fabricate sand mold,and bottom-back rapidly pouring with Ar protection was designed.Through using one steel ladle pouring with diameter of ladle of 2×φ110 mm and diameter of runner of 2×φ140 mm as well as diameter of ingates of 4×φ100 mm,the CPR1000 primary pump shell was produced successfully with lifting velocity of 1220 mm/s at 1 5201 550 ℃for 120150 s.关键词：Primary Pump Shell;Sand Mould;Casting
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发布时间：2023-12-18 - 摘要：The double eccentric butterfly valve with a thick and large cross section exists the unstable and the unqualified problems in property index by using the 3 to 8 light rare earths nodularizer.The change of structure and mechanical properties of the casting after pouring control were analyzed with applying the yttrium base heavy rare earths nodularizer（TZ-3 A）as well as adjusting the content of C and Si elements with strictly controlling the content of alloying elements.The spheroidizing and the inoculation treatment were performed according to the original technology.The problems such as spheroidizing fading in the heart part of the double eccentric butterfly valve,graphite ball coarseness and graphite flowering were solved.The results show that the tensile strength and the elongation of the valve body reach more than 450 MPa and 10%,respectively,meeting the requirements of the customers.关键词：Double Eccentric Butterfly Valve;Nodularizer;Technology
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发布时间：2023-12-18 - 摘要：5%Al2O3p/ZL109composites were fabricated successfully by semi-solid mechanical stirring with aid of electromagnetic stirring technology in A1/SiO2system.The effects of electromagnetic stirring on the dispersion ofα-Al2O3particles,tensile property and Brinell hardness of the composites were investigated.And the linear thermal expansion coefficient（LTEC）of ZL109and composites were also tested.The results reveal thatα-Al2O3particles present the desirable dispersion effect with current of250A,frequency of 5Hz,magnetic induction intensity of 0.039Tfor 10min,and agglomeration phenomenon can be ignored.Tensile strength and Brinell hardness of T6-treated composites reach 325MPa and 148HB,increased by 10.2%and 18.4%,respectively,compared with those of the matrix alloy.Because of the introduction of hardα-Al2O3particles,the elongation（2.7%）of composite is decreased by20.6%compared with that of ZL109 matrix alloy.At 30400℃,the LTEC values of the composites are lower than those of ZL109.At 30℃and 400℃,the LTEC values of composites are decreased by7.97%and 3.79%compared with those of ZL109,respectively.关键词：Al/SiO2 System;Direct Melt Reaction;Composites;Linear Thermal Expansion Coefficient
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发布时间：2023-12-18 - 摘要：Effects of parameters of pulsed magnetic field and cooling conditions on size,morphology and distribution of primary Mg2Si phase in Mg2Si/Al composites were investigated.The results show that the primary Mg2Si phase shows coarsening tendecny,segregation and gradient distribution under pulsed magnetic field.In most conditions,the volume fraction of the primary Mg2Si phase is increased gradually from the center to the edge of the specimen,and gradient materials with continuous change of primary Mg2Si phase could be prepared sucessfully.With the pouring temperature of 760℃,the volume fraction of the primary Mg2Si phase is decreased at the edge of the sample.With the pulse voltage of 100V,the pulse frequency of 10Hz or the mold temperature of 400℃,absence of primary Mg2Si phase in the central region of the sample can be observed,while the primary Mg2Si phase is distributed mainly on the edge of specimen,so surface reinforced in-situ gradient composites can be prepared.In the range of 0300V,with the increase of pulse voltage,the size of the primary Mg2Si phase is increased at first and then decreased,and the turn point is 200 V.When the pouring temperature is at 670760℃or the mould temperature is at 200600℃,with the increase of pouring temperature or the decrease of mould temperature,the size of the primary Mg2Si phase is decreased.关键词：Pulsed Magnetic Field;Mg2Si/Al Composites;Primary Mg2Si Phase;Gradient Material
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发布时间：2023-12-18 - 摘要：The action mechanism of oxide layer crack and volatilization of molybdenum oxides in the oxidative kinetics of high entropy alloy Mo25 Nb25Ta25W25was described.An equal mole ratio Mo25Nb25Ta25W25alloy with a simple BCC structure was prepared by hot-pressing sintering.The oxidation behavior of the high entorpy alloy were analyzed at 800℃、900℃and 1 000℃,respectively,and the oxidation mechanism was expounded.The oxides were characterized by XRD,SEM and electron probe X-ray microanalyzer（EPMA）.The results reveal that at oxidation temperature range,the main oxidation products are Ta16W18O94and Nb14W3O47 with some protection in the oxide layer.The kinetics of the tested samples follows the parabolic law at 800℃,while follows the linear law at the middle of 900℃and1 000℃,which are attributed to the volatilization of MoO3leading to oxide layer loose and porous at higher temperature.关键词：High Entropy Alloy;High Temperature Oxidation Resistance;Oxidation Kinetics;Oxidation Mechanism
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发布时间：2023-12-18 - 摘要：Effects of annealing temperature on the microstructure and microhardness of Zr65Cu17.5Ni10Al7.5metallic glass were investigated using differential scanning calorimetry（DSC）,X-ray diffraction（XRD）,scanning electron microscopy（SEM）and microhardness analysis.The glass transition temperature Tgand the crystallization temperature Txare increased with increasing in heating rate.The structure of the sample keeps amorphous state after annealing at 623K（below Tg）for 30min.Crystallization occurrs after the samples annealed at 723K（between Tgand Tx）,823Kand 923K（above Tx）,and the crystalline phases are CuZr2 and NiZr2.With increasing in annealing temperature,the crystallization degree is increased gradually and then reached saturation.The nucleation and growth of nano-size crystals occur,and the microhardness is increased firstly and then decreased gradually.关键词：Metallic Glasses;Annealing;Microstructure;Microhardness
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发布时间：2023-12-18 - 摘要：The surface of GH4169 alloy was treated by wet shot peening,and effects of shot peening projectile size on the surface morphology,microstructure,roughness and micro-hardness of GH4169 alloys were investigated.The results show that the surface integrity of the alloy is decreased with the increase of the projectile size,while the shot peening layer,the microhardness and the surface roughness are increased.With 4 mm wet shot peening for 5 min,the shot peening effect layer and surface micro-hardness reach 320μm and 356 HV,respectively.关键词：GH4169 Alloy;Wet Shot Peening;Microstructures;Surface Performance;Projectile Size
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发布时间：2023-12-18 - 摘要：Direct aging treatment with different temperature was carried out on as-cast Cu-49.29 Cr alloy,and effects of aging treatment on thermal expansion coefficient and resistivity of as-cast Cu-49.29 Cr alloy were analyzed by optical microscope,transmission electron microscopy,resistivity tester and dilatometer.The results show that aging treatment can decrease the resistivity of the alloy.After aging treatment at 550 ℃for 2 h,the alloy can obtain a lower resistivity of 4.958×10-8Ω·m,decreased by 7.71×10-9Ω·m compared with that of the as-cast alloy.However,the change of thermal expansion coefficient can be neglected.关键词：Cu-49.29Cr Alloy;Aging Treatment;Thermal Expansion Coefficient;Resistivity
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发布时间：2023-12-18 - 摘要：The effects of the mixture of MgAl2O4 and MgO on the grain size and the morphology of second phase in 8079aluminum alloy were investigated systematically by XRD（X-ray diffraction）,OM（optical microscopy）,SEM（scanning electron microscopy）and EDS（energy dispersive spectrometer）.The results show that MgAl2O4and MgO have obvious refinement effect on the microstructure of 8079aluminum alloy,and they can modify the morphology of needle-like Al3Fe.With the increase of the mixture of MgAl2O4 and MgO,the grain size of the 8079aluminum alloy is decreased gradually,and the needle-like phase becomes smaller with the shape modified to particle.With adding a mixture of 0.05%MgAl2O4 and MgO,the grain size of 8079aluminum alloy can be decreased effectively from more than100μm to about 30μm,and the shape of need-like Al3Fe phase is converted into particle structure.关键词：8079 Aluminum Alloy;Grain Refinement;Al3Fe;Morphology;MgAl2O4;Modification
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发布时间：2023-12-18 - 摘要：The effects of Ni content on the microstructure of Mg98-xEr2Nix（x=0,0.25,0.5,1,mole fraction）alloy were investigated by means of OM（optical microscope）,XRD（X-ray diffraction）,SEM（scanning electron microscope）and EDS（energy dispersed spectrometer）.The results show that the ascast Mg98Er2alloy is composed of primary dendriteα-Mg phase with segregation of components.The composition phases of the three alloys of Mg97.5Er2Ni0.25,Mg97.5Er2Ni0.5 and Mg97Er2Ni1,are mainly composed ofα-Mg phase and LPSO phase.The area fraction of the second phase reach 12%,19%and34%,respectively.During solid solution treatment at 540℃,the structure change of Mg98-xEr2Nixalloy can be ignored,and the second phase is not dissolved obviously.Compared with that of the as-cast alloys,the area fraction of the three alloys of Mg97.75Er2Ni0.25,Mg97.5Er2Ni0.5and Mg97Er2Ni1,after solution treatment,reach 16%,34%and 42%,respectively.关键词：Mg-Er-Ni Alloy;LPSO;Solution Treatment
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发布时间：2023-12-18 - 摘要：The multi-objective optimization of isothermal forging process parameters for 7050 aluminum alloy was carried out by means of orthogonal experiment and VIKOR method.The optimum parameters include the forging temperature,the degree of deformation,the forging rate and the time of solid solution.The tensile strength of the forming parts,the surface hardness,the elongation and the average diameter of the grain are optimized for the comprehensive process.First,orthogonal test was used to get data samples,and then VIKOR method was used to analyze the experimental data to optimize the process parameters.The optimization results are presented as follows:forging temperature of 400 ℃,deformation rate of 60%,forging rate of 15 mm/s and solid solution time of 2.5 h.关键词：7050 Alloy;Forging;Processing Parameters;Optimization;VIKOR Method
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发布时间：2023-12-18 - 摘要：The effects of super-gravity field on the eutectic microstructure and microhardness of Al-12 Si alloy without modification and with sodium modification were investigated by centrifuge.The results reveal that,the central eutectic silicon in the un-modified Al-12 Si alloy can be refined significantly and granulated in the super-gravity field,and most of the central eutectic silicon presents granular with a diameter of about 0.7μm with solidified at 4 000 g（g=9.8 m/s2）.In addition,the central eutectic silicon can be refined and granulated to a higher degree under compound action of super-gravity field and sodium salt metamorphism,and the central eutectic silicon is basically granular with a diameter of about 0.3μm when the super-gravity field reaches 3 000 g.With the increase of gravity field,the central hardness（HV）of the un-modified alloy is increased gradually and reaches the maximum value of 72 at 4 000 g.The central hardness（HV）is increased more obviously when the sodium salt metamorphic alloy is solidified in the super-gravity field and reaches the maximum value of 88 at 3 000 g.关键词：High Gravity Field;Sodium Salt Metamorphism;Al-12Si Alloy;Eutectic Silicon;Hardness
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发布时间：2023-12-18
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