热处理对搅拌铸造Ti_(p)/AZ91 D镁基复合材料组织与力学性能的影响  

Effect of Heat Treatment on the Microstructure and Mechanical Properties of Ti_(p)/AZ91D Magnesium Alloy Composite Fabricated by Stir Casting

作　　者：郭婷婷 张晓辉 康跃华 李建波 陈先华[3] 刘桐宇[1] 郑开宏 潘复生 GUO Ting-ting;ZHANG Xiao-hui;KANG Yue-hua;LI Jian-bo;CHEN Xian-hua;LIU Tong-yu;ZHENG Kai-hong;PAN Fu-sheng(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110000,Liaoning,China;Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application,Institute of New Materials,Guangdong Academy of Sciences,Guangzhou 510650,Guangdong,China;School of Materials Science and Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110000 [2]广东省金属强韧化技术与应用重点实验室,广东省科学院新材料研究所,广东广州510650 [3]重庆大学材料科学与工程学院,重庆400044

出　　处：《铸造》2023年第6期673-679,共7页Foundry

基　　金：国家重点研发计划青年科学家项目(2022YFB3708400);国家自然科学基金青年科学基金项目(52203372);广东省基础与应用基础研究重大项目(2020B0301030006);广东省科学院建设国内一流研究机构行动专项资金项目(2020GDASYL-20200101001);桂林理工大学有色金属及材料加工新技术教育部重点实验室/广西光电材料与器件重点实验室开放基金资助(20KF-7)。

摘　　要：采用光学显微镜、扫描电子显微镜、X射线衍射和显微硬度及室温拉伸力学性能测试等方法,分析研究了固溶、时效热处理对搅拌铸造Ti_(p)/AZ91D复合材料(体积分数4.0%,平均粒径6.5μm)的微观组织和力学性能的影响规律。结果表明,400℃固溶热处理时,Tip/AZ91D复合材料的固溶时间为2 h,比基体AZ91D合金缩短8 h,原因是复合材料组织中的共晶β-Mg17Al12相比基体合金中的较细小、弥散,更快溶解进入α-Mg基体相。在168℃时效热处理时,复合材料中的Ti颗粒界面促进β相析出,使其峰值时效时间只需16 h,比基体合金缩短一半。经过固溶时效热处理后,复合材料的屈服强度和抗拉强度分别达到150 MPa和217 MPa,比基体合金均有所提高。The effect of heat treatment including solution and aging treatment on the microstructure and mechanical properties of Ti_(p)/AZ91D composite(with 4.0vol%of metal Ti particles and average diameter of 6.5(m)fabricated by stir casting had been investigated by optical microscopy,scanning electron microscopy,X-ray diffraction,and microhardness and room temperature tensile mechanical properties tests.The results indicated that the solution treatment time of the Tip-AZ91D composite was 2 h,which was 8 h shorter than that of the AZ91D alloy.It was found that the eutectic phase size ofβ-Mg17Al12 in the composite was finer than that in the AZ91D alloy,which led to the rapidly dissolution.When aging at 168℃,the peak aging time of the composite was 16 h,which was half that of the AZ91D alloy.It was observed that theβphase precipitates at the Ti particles interface,which resulted in the rapidly age hardening.The yield and tensile strength of the composite was 150 MPa and 217 MPa,respectively,after aging treatment,both of which were increased compared with the matrix alloy.

关 键 词：Ti_(p)/AZ91D镁基复合材料 固溶时效热处理 微观组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]