固溶处理对铸态Mg-4Al-2Si合金组织和性能的影响  

Effects of Solution Treatment on Microstructure and Mechanical Properties of Mg-4Al-2Si Alloy

作　　者：宋佩维[1] 

机构地区：[1]陕西理工学院材料科学与工程学院

出　　处：《特种铸造及有色合金》2011年第4期311-314,394,共4页Special Casting & Nonferrous Alloys

基　　金：陕西省自然科学基础研究计划资助项目(2010JM6009);陕西省教育厅自然科学专项科研计划资助项目(2010JK470)

摘　　要：研究了固溶处理对铸态Mg-4Al-2Si(AS42)合金组织和性能的影响。结果表明,铸态与热处理态合金均由α-Mg基体、β-Mg17Al12相和Mg2Si相3部分组成。固溶处理使合金中的β-Mg17Al12相发生部分溶解,汉字状Mg2Si相颗粒出现球状化,合金的力学性能有较大幅度的提高。铸态与热处理态合金的断裂形式均为准解理脆性断裂。Effects of solid solution treatment(T4) on microstructure and mechanical properties of Mg-4Al-2Si(AS42) alloy were investigated.The results show that the alloy at both as-cast and heat treatment states is composed of α-Mg matrix,β-Mg17Al12 phase and Mg2Si phase.Mechanical properties of the T4 treated alloy are remarkably improved as a result of partially dissolution of β-Mg17Al12 phase and the spheroidization of Chinese script Mg2Si phase.The fracture mechanism of the both as-cast and T4 treated alloy is characterized by quasi-cleavage brittle fracture.

关 键 词：Mg-4Al-2Si镁合金 固溶处理 显微组织 力学性能 

分 类 号：TG113[金属学及工艺—物理冶金]