固溶时间对Ti@(Al-Si-Ti)_(p)/A356复合材料组织及力学性能的影响  

Effects of Solid Solution Time on Microstructure and Mechanical Properties of Ti@(Al-Si-Ti)_(p)/A356 Composites

作　　者：张金玉 陈体军[1,2] ZHANG Jinyu;EN Tijun(School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Shanxi Diesel Heavy Industry Co.,Ltd.,Lanzhou 730050,China;State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Xingping 713105,China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州73050 [2]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州73050 [3]陕西柴油机重工有限公司,陕西兴平713105

出　　处：《热加工工艺》2024年第6期21-25,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目(51564035)。

摘　　要：采用粉末触变成形技术制备了原位自生心-壳结构增强A356铝基复合材料,并研究了固溶时间对Ti@(Al-Si-Ti)_(p)/A356复合材料显微其组织及力学性能的影响。结果表明,随着固溶时间增加,初生α-Al相颗粒粗化长大;共晶Si相不断溶解,晶界上残余的共晶Si粗化、球状化;Al基体、Ti心部继续反应,增强体颗粒壳层发生相转变。复合材料在545℃固溶处理1 h时,力学性能达到峰值,其抗拉强度、屈服强度和伸长率分别为263.9 MPa、175.1 MPa、20%,比制备态复合材料分别提高了7.3%、21.4%和12.4%,维氏硬度也从59.3 HV提高到72.8 HV。In situ self-forming core-shell reinforced A356 aluminum matrix composites were prepared by powder thixotropic forming technique.The effects of solid solution time on the microstructure and mechanical properties of Ti@(Al-Si-Ti)_(p)/A356 composite were investigated.The results show that,with the solution time increasing,the primaryα-Al phase particles coarsen and grow.Eutectic Si phase is dissolved continuously,and the residual eutectic Si on grain boundaries is coarsened and spherical.Al matrix and Ti core continue to react and phase transition occurs in the enhanced granular shell.The mechanical properties of the composite reaches a peak at 545℃solution treatment for 1 h,and their tensile strength,yield strength and elongation are 263.9 MPa,175.1 MPa and 20%,respectively.Compared with the prepared composites,7.3%,21.4%and 12.4%are increased,respectively.The vickers hardness is also increased from 59.3 HV to 72.8 HV.

关 键 词：粉末触变成形 Ti@(Al-Si-Ti)_(p)/A356复合材料 固溶时间 力学性能 

分 类 号：TG156.1[金属学及工艺—热处理] TB333.12[金属学及工艺—金属学]