固溶处理对Mg-8Al-1Zn-1Si合金组织与性能的影响  

Effect of Solution Treatment on Microstructure and Mechanical Properties of Mg-8Al-1Zn-1Si Alloy

作　　者：王玉琴[1] 张会[2] 

机构地区：[1]陕西理工大学土木工程与建筑学院,陕西汉中723000 [2]陕西理工大学材料科学与工程学院,陕西汉中723000

出　　处：《铸造技术》2016年第10期2085-2088,共4页Foundry Technology

基　　金：陕西省自然科学基金资助项目(2016JM5093);陕西省自然科学基金资助项目(2010JM6009);陕西省教育厅科研计划资助项目(2010JK470)

摘　　要：研究了固溶处理对Mg-8Al-1Zn-1Si合金显微组织和力学性能的影响。结果表明,铸态合金主要由α-Mg、β-Mg17Al12和Mg_2Si相组成。固溶处理过程中,β-Mg17Al12相溶于基体而形成α-Mg过饱和固溶体,粗大的汉字状Mg_2Si相颗粒逐渐溶解、溶断而转变为相对细小的球状。随固溶处理时间延长,合金的硬度逐渐降低;室温与150℃下的抗拉强度、屈服强度和伸长率逐渐提高。合金的拉伸断裂形式为准解理脆性断裂。The effect of solution treatment on the microstructure and mechanical properties of Mg-8Al-1Zn-1Si alloy was investigated.The results show that the as-cast alloy is composed of α-Mg matrix,β-Mg17Al12 phase and Mg_2Si phase.During solution treatment,the β-Mg17Al12 phase is dissolved into the magnesium matrix and forms into α-Mg supersaturated solid solution.Meanwhile,the coarse Mg_2Si phases tend to dissolve,break and become the relatively finer sphericity.The hardness of the alloy decreases gradually with increasing the solution treatment time,and the ultimate tensile strength,yield strength and elongation of the alloy increase at room temperature and 150 ℃.The fracture surface of the alloy is quasicleavage brittle fracture.

关 键 词：Mg-Al-Zn-Si合金 固溶处理 显微组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG156.94[金属学及工艺—金属材料]