重熔时间对固溶态Ti@(Al-Si-Ti)_(p)/A356复合材料组织和性能的影响  

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

作　　者：陈体军[1] 张治国[1] 张学拯 张金玉 Chen Tijun;Zhang Zhiguo;Zhang Xuezheng;Zhang Jinyu(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology;Shaanxi Diesel Heavy Industry Co.Ltd.)

机构地区：[1]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,兰州730050 [2]陕西柴油机重工有限公司

出　　处：《特种铸造及有色合金》2023年第6期729-736,共8页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51564035)。

摘　　要：通过粉末触变法制备了一种“芯-壳”结构颗粒增强A356铝基复合材料[Ti@(Al-Si-Ti)_(p)/A356],并对不同重熔时间下制备的复合材料进行545℃×1 h的固溶处理,研究了重熔时间对基体微观组织和“芯-壳”结构颗粒微观组织的演变和力学性能的影响。结果表明,随部分重熔时间延长,固溶态复合材料中初生α-Al颗粒不断粗化,共晶组织球化和粗化并且含量逐渐减少,“芯-壳”结构颗粒的壳层进一步反应增厚直至Ti芯被完全消耗。重熔时间为40 min的固溶态复合材料的力学性能最好,其屈服强度、抗拉强度和伸长率分别为172.1 MPa、263.9 MPa和20.0%,与铸态复合材料相比分别提高了7.3%、11.7%和12.4%。A kind of particle-reinforced A356 aluminum matrix composite[Ti@(Al-Si-Ti)_(p)/A356]with"coreshell"structure was fabricated by powder thixoforming technique,and the composites formed for different reheating time were solid solution treated at 545℃for 1 h.The effects of reheating time on microstructure evolution of the matrix alloy and"core-shell"structured particles,as well as tensile properties were investigated.The results indicate that with the increase of the reheating time,the primaryα-Al particles in the solution-treated composites are continuously coarsened,and the eutectic morphology is spheroidized and coarsened with content decrease.The"core-shell"structured particles further react to thickening until the Ti core is consumed.The mechanical properties of solution-treated composites are desirable when reheating time is 40 min,where the yield strength,tensile strength and elongation is 172.1 MPa,263.9 MPa and 20.0%,which is 7.3%,11.7%and 12.4%higher than that of as-cast ones,respectively.

关 键 词：粉末触变成形 铝基复合材料 “芯-壳”结构增强体 组织 力学性能 

分 类 号：TB331[一般工业技术—材料科学与工程] TG113.25[金属学及工艺—物理冶金] TG249.26[金属学及工艺—金属学]