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transactions of Nonferrous Metals Society of China 2018年第3期28卷 385-392页

作者： Ridvan GECU Serhat ACAR Alptekin KISASOZ Kerem ALtUG GULER Ahmet KARAASLAN Department of Metallurgical and Materials Engineering Yildiz Technical UniversityDavutpasa Campus

the effects of t6 heat treatment on thixoforged A356 and A380 aluminium alloys were *** superheat casting(LSC)technique was carried out to prepare proper specimens for thixoforging *** samples were poured at 20°C above their liquidus temperatures which provided the formation of equiaxed grains instead of dendritic *** billets were reheated for varied time from 20 to 80 min and thixoforged with 50%deformation *** thixoforging process,the samples were t6 heat treated for both A356 and A380 *** microstructural evaluation and hardness alteration of thixoforged,solution treated and aged specimens were examined comparatively by using optical microscopy,scanning electron microscopy with energy-dispersive X-ray spectroscopy and Brinell hardness equipment.t6 heat treatment provided relatively uniform microstructure with newly formed precipitates that are Mg2Si and Al2Cu for A356 and A380 billets,***,hardness after artificial aging was increased considerably and reached HB 93 for A356 and HB 120 for A380 alloys.

关键词： t6 heat treatment thixoforging low superheat casting aluminium alloy

Effect of Strontium and t6 heat treatment on Structure and Performance of Al-11.6Si-0.5Mg Alloy

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Effect of Strontium and T6 Heat Treatment on Structure and P...

Nano-yttrium-containing precipitates of t6 heat-treated A356.2 alloy when trace yttrium(Y less than 0.100 wt%) added

中国材料大会2012

作者： Jixing Lin Junping Zhang Liyuan Niu Daren Sun Zimu Shi Yong Li Guangyu Li Advanced Material Research and Development Center Zhejiang Industry & Trade Vocational College Key Laboratory of Automobile Materials Ministry of EducationCollege of Materials Science and EngineeringJilin University

ISBN: (纸本)9783037856093

In this study,Strontium（Sr） was added as modifier during the casting of Al-11.6Si-0.5Mg alloy,and the effect of t6 heat treatment on microstructure and performance of alloy was also *** results showed that the 0.3% Al-8%Sr master alloy can refine effectively the α-Al dendrite and eutectic structure;the best economic process of t6 heat treatment is solution at 535℃ for 6 hrs.,and water cooling at 50～60℃,aging at 160℃ for 6 hrs,then air *** Sr modification and t6 heat treatment,the mechanical properties of alloy are improved remarkably,i.e.,the tensile strength increased to 348MPa from 183MPa before modification and the elongation raises from 3.0% to 6.5%.So this alloy is applied to the strain clamp products in electric power fitting industry.

关键词： Sr Modification t6 heat treatment Near Eutectic Al-Si Alloy.

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Rare Metals 2021年第11期40卷 3279-3288页

作者： Xin-Ping Hu Qing Wang Henry Hu Rui-Xin Li Yang Zhao Zhi-Ming Wang Bing-Rong Zhang School of Mechanical and Automotive Engineering Qilu University of TechnologyJinan 250353China Department of Mechanical University of WindsorAutomotive&MaterialsEngineering Windsor N9B 3P4Canada

to investigate the effect of yttrium(Y) on microstructure refinement and mechanical properties of aluminum alloy A356.2,the different trace contents of Y(0 wt%,0.025 wt%,0.050 wt%,0.075 wt%,or 0.100 wt%)were introduced into the liquid *** alloys were fabricated in a preheated permanent mold,and subsequently treated by a t6 heat *** results of tensile testing indicate that the yield strength(YS),the ultimate tensile strength(UtS) and the elongation(El) of the A356.2 alloy are improved by the Y *** YS dependence on grain size for the test alloys follows the Hall-Petch equation,which gives YS=-354.1+2875.2 d^(-1/2) with a correlation of R^(2)=*** 0.050 wt%Y is added,the optimum values of the YS,UtS and El are achieved after t6 heat *** secondary phases were identified by X-ray diffraction(XRD) which mainly consisted as Si,Mg2 Si and Al3 *** scanning electron microscope(SEM) and energy-dispersive spectrometer(EDS) analyses reveal the presence of the nano-sized Al3 Y particles on the surface of the Si *** A356.2 alloy with the Y addition is strengthened by the dendritic refinement,and the presence of the micron-and nano-sized Al3 Y precipitates.

关键词： Yttrium Microstructures Mechanical properties t6 heat treatment A356.2 alloy

Effects of Zr additions on structure and tensile properties of an Al-4.5Cu-0.3Mg-0.05ti(wt.%) alloy

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China Foundry 2022年第1期19卷 9-16页

作者： Hamed Kamali Erfan Kamali Massoud Emamy School of Metallurgy and Materials Engineering College of EngineeringUniversity of TehranP.O.Box 11155-4563TehranIran Faculty of Materials Engineering Sahand University of TechnologyP.O.Box 51335-1996TabrizIran

the effects of different Zr additions(0.05wt.%-0.5wt.%)on the structure and tensile properties of an Al-4.5Cu-0.3Mg-0.05ti(wt.%)alloy solidified under a high cooling rate(18℃·s^(-1)),in as-cast and t6 heat-treated conditions were *** as-cast structure of the alloy consists of equiaxed grains ofα-Al with an average size of 64μm which is unaffected by the Zr additions,indicating the ineffectiveness of Zr in the grain refinement of the *** electron microscopy,along with X-ray diffraction analysis revealed the presence of elongatedθ-Al2Cu at the grain boundaries;in addition,coarse Al3Zr particles exist in the intergranular regions of the 0.5wt.%Zr-containing *** the t6 heat treatment,the elongatedθparticles were fragmented;however,the coarse Al3Zr particles remained unchanged in the ***,the formation of fineβ’-Al3Zr andθ’’-Al3Cu/θ’-Al2Cu phases during t6 heat treatment was revealed by transmission electron *** results of the tensile tests showed that the Zr additions increase the strength of the alloy in both as-cast and t6 heat-treated conditions,but reduce its elongation,especially with 0.5wt.%Zr *** 0.3wt.%Zr-added alloy in the t6 heat-treated condition has the highest quality index value(249 MPa).Fractography of the fracture surfaces of the alloys revealed ductile fracture mode including dimples and cracked intermetallic phases in both conditions.

关键词： Al-Cu-Mg alloys casting t6 heat treatment structure precipitation hardening tensile properties fractography

Microstructure and mechanical properties of 600 MPa grade ultra-high strength aluminum alloy fabricated by wire-arc additive manufacturing

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Journal of Materials Science & technology 2023年第18期149卷 56-66页

作者： Xinpeng Guo Huijun Li Peng Xue Zengxi Pan Rongzheng Xu Dingrui Ni Zongyi Ma School of Mechanical Materialsand Mechatronics and Biomedical EngineeringUniversity of WollongongWollongongNSW 2522Australia Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of Materials Science and Engineering Shenyang Aerospace UniversityShenyang 110136China

the utilization of wire-arc additive manufacturing(WAAM)technology for the preparation of Al-Zn-Mg-Cu aluminum alloy has made some progress in recent ***,the challenge still remains to achieve ultra-high strength(600 MPa)in *** this study,the crack-free Al-Zn-Mg-Cu-Sc thin-wall component with ultra-high strength was successfully fabricated by the cold metal transfer(CMt)pro-cess using a self-prepared 7B55-Sc filler *** microstructures of both as-deposited and t6 heat-treated samples were all composed of fine equiaxed grains with an average size of about 6.0μ*** primary Al_(3)(Sc,Zr)particles acted as heterogeneous nuclei to promote the formation of equiaxed grains and refine the microstructures during the solidification process.A large amount of continuous eutectic structures rich in Al,Zn,Mg,and Cu elements formed along the grain boundaries under the as-deposited condition,and the precipitated second phases within the grains mainly included the equilibriumηphase,metastableηphase and large-sized t *** t6 heat treatment,the majority of the second phases originally distributed within grains and along grain boundaries were dissolved into the Al matrix,and a large amount of fine GP zones,ηphase and secondary Al_(3)(Sc,Zr)particles were precipitated within the grains during the aging *** tensile strength reached a recorded level of 618 MPa in the hori-zontal direction after t6 heat treatment,which was considered a breakthrough for the manufacturing of 600 MPa grade aluminum alloy by WAAM.

关键词： Wire-arc additive manufacturing Al-Zn-Mg-Cu alloy t6 heat treatment Microstructure Second phase Mechanical property

Effects of minor Y,Zr and Er addition on microstructure and properties of Al-5Cu-0.4Mn alloy

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China Foundry 2017年第6期14卷 461-468页

作者： Feng Zhang ting-biao Guo Qi Li Chen Wang Wan-wu Ding Qing-lin Li State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Lanzhou 730050 China Key Laboratory of Nonferrous Alloys and Processing of Ministry of Education Lanzhou 730050 China

the effect of different contents of Y, Zr and Er on microstructure and properties of Al-5 Cu-0.4 Mn alloy was investigated. t6 heat treatment, OM, SEM and EDS methods were applied to the alloy. the results showed that fluidity and elongation of alloy adding Y, Zr and Er were improved, while with the increase of addition amounts, θ phase increased and grains were trended to grow up gradually. the Al-5 Cu-0.4 Mn alloy presented the maxed style of ductile and brittle fracture. After t6 heat treatment, the precipitation amounts of θ phase decreased dramatically and tensile strength and hardness significantly increased. Especially when addition contents were among 0.1-0.3 wt.%, tensile strength and hardness of heat-treated alloy increased greatly, almost doubled as that of the as-cast state. the tensile strength reached its maximum of 378.43 MPa when the addition amount was 0.3 wt.%. With the further increase of addition amounts, the elongation deteriorated and the proportion of ductile fracture reduced due to the limited dispersion strengthening effect of θ phase and Al_8Cu_4 Er. It demonstrated that addition of 0.1-0.3 wt.% Y, Zr and Er would generate positive effects and influences on Al-5 Cu-0.4 Mn alloy, which is significant for optimizing components and improving properties of Al-5 Cu-0.4 Mn alloy.

关键词： Al-Cu-Mn alloy t6 heat treatment microstructure mechanical properties

Research on high strength hypoeutectic Al-Si alloy

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Research on high strength hypoeutectic Al-Si alloy

Microstructural evolution and mechanical properties of thixoformed A319 alloys containing variable amounts of magnesium

第八届中国功能材料及其应用学术会议

作者： JIA ting-ting CHEN Guo-shi ZHANG Shuo WU Ming GENG Hao-ran School of Materials Science and Engineering University of Jinan

ISBN: (纸本)9783037859698

In this study,hypoeutectic Al-Si casting alloy was investigated to obtain high strength,according to alloying of Cu Mg,refining of Al-5ti-B master alloy,modifing of Re and t6 heat *** experimental results show that the mechanicalproperties of the tested alloy reach peak when addition of Al-5ti-1B alloy is 1.0%after heat treatment,especially the yield strength,correspondingly,microstructure distribution gets to the best *** Al-5ti-1B exceeds1.0%,the mechanicalproperties descend *** metalliccompounds of MgSi phase,CuA1 phase and W phase precipitated along the grain boundary and strengthened dispersively can improve mechanical propertiesof the tested *** yield strength of samplesadded 0.1%Re(La 50%,Ce 40%) increases slightly,simultaneously,the tensile strength and elongation *** 0.1%Re,the mechanicalproperties get down.

关键词： hypoeutectic Al-Si alloy Al-5ti-1B t6 heat treatment mechanical properties

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transactions of Nonferrous Metals Society of China 2016年第8期26卷 2029-2042页

作者： M.S.SALLEH M.Z.OMAR K.S.ALHAWARI M.N.MOHAMMED M.A.MAD ALI E.MOHAMAD Department of Manufacturing Process Faculty of Manufacturing Engineering Universiti Teknikal Malaysia Melaka Department of Mechanical and Materials Engineering Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia Department of Engineering and technology Faculty of Information Sciences and EngineeringManagement and Science University

the effects of Mg content on the microstructure and tensile properties of thixoformed A319 alloys were studied. the samples were thixoformed at 50% liquid content and some of the thixoformed samples were subjected to the t6 heat treatment. the samples were then examined by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy and X-ray diffraction (XRD) analysis as well as tensile tests. the results showed that magnesium was able to refine the eutectic silicon in the samples. It was also observed that a compact Al9FeMg3Si5 phase was formed when the magnesium content was 1.0% and 1.5%. the results also revealed that as the magnesium content in the alloy increases, the tensile strengths of the thixoformed alloys also increase. the ultimate tensile strength, yield strength and elongation to fracture of the thixoformed A319 heat treated alloy were 298 MPa, 201 MPa and 4.5%, respectively, whereas the values of the thixoformed heat treated alloy with 1.5% Mg content were 325 MPa, 251 MPa and 1.4%, respectively. thixoformed A319 alloy showed a dimple fracture behaviour, while thixoformed A319 alloys with 1.5% Mg showed a mixed mode fracture behaviour, where dimple and cleavage ruptures were seen on the fracture surface of the samples.

关键词： aluminium alloy thixoforming t6 heat treatment mechanical properties

Influence of Cu content on microstructure and mechanical properties of thixoformed Al-Si-Cu-Mg alloys

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transactions of Nonferrous Metals Society of China 2015年第11期25卷 3523-3538页

作者： M.S.SALLEH M.Z.OMAR Department of Mechanical and Materials Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Department of Manufacturing Process Faculty of Manufacturing Engineering Universiti Teknikal Malaysia Melaka

the effects of Cu content on the microstructure and mechanical properties of thixoformed Al-6Si-xCu-0.3Mg(x= 3,4,5and 6,mass fraction,%) alloys were *** samples were thixoformed at 50%liquid content and several of the samples were treated with the t6 heat *** samples were then examined by optical microscopy(OM),scanning electron microscopy(SEM),energy dispersive X-ray(EDX) spectroscopy and X-ray diffraction(XRD) analysis,as well as hardness and tensile *** results show that the cooling slope casting and thixoforming process promote the formation of very fine and well distributed intermetallic compounds in the aluminium matrix and the mechanical properties of the alloys increase considerably compared with the permanent mould *** results also reveal that as the Cu content in the alloy increases,the hardness and tensile strength of the thixoformed alloys also *** ultimate tensile strength,yield strength and elongation to fracture of the thixoformed heat-treated Al-6Si-3Cu-0.3Mg alloy are 298 MPa,201 MPa and 4.5%,respectively,whereas the values of the thixoformed heat-treated alloy with high Cu content(6%) are 361 MPa,274 MPa and 1.1%,*** fracture of the thixoformed Al-6Si-3Cu-0.3Mg alloy shows a dimple rupture,whereas in the alloy that contains the highest Cu content(6%),a cleavage fracture is observed.

关键词： Al-Si-Cu-Mg alloy Cu content thixoforming t6 heat treatment mechanical properties

Synthesis of nano-to micrometer-sized B_(4)C particle-reinforced aluminum matrix composites via powder metallurgy and subsequent heat treatment

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Journal of Central South University 2021年第8期28卷 2295-2306页

作者： LIU Rui-feng WANG Wen-xian CHEN Hong-sheng College of Aeronautics and Astronautics Taiyuan University of TechnologyTaiyuan 030024China Shanxi Key Laboratory of Advanced Magnesium-based Materials Taiyuan 030024China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China College of Mechanical Engineering Taiyuan University of TechnologyTaiyuan 030024China

B4C/6061Al composites reinforced with nano-to micrometer-sized B4C particles were fabricated via powder metallurgy route consisting of spark plasma sintering(SPS)and hot extrusion and rolling(HER),followed by t6 *** microstructural evolution and mechanical properties were *** showed that the status of B4C particles changed from a network after SPS to a dispersion distribution after *** substructured grains reached 66.5%owing to the pinning effect of nano-sized B4C,and the grain size was refined from 3.12μm to 1.56μm after *** t6 treatment,dispersed Mg_(2)Si precipitated phases formed,and the grain size increased to 1.87μ*** recrystallized grains around micro-sized B4C were smaller than those in the areas with uniform distribution of nano-sized B4C and Mg_(2)*** stress distributions of as-rolled and heated composites were similar,considering that the t6 heat treatment was only effective in eliminating the first internal *** Vickers,microhardness,and tensile strength of as-SPSed composites were greatly improved from HV 55.45,0.86 GPa,and 180 MPa to HV 77.51,1.08 GPa,and 310 MPa,*** the precipitation strengthening,the corresponding values of as-heated composites decreased to HV 70.82,0.85 GPa,and 230 MPa owing to grain coarsening.

关键词： nano-to micrometer-size B_(4)C/6061 Al composites t6 heat treatment