摘要
采用重力铸造法制备Mg-8Al-1Zn-1Si-0.6Sb合金,研究了固溶处理对该合金组织及力学性能的影响。结果表明,铸态合金主要由α-Mg、β-Mg_(17)Al_(12)、Mg_2Si、Mg Zn和Mg_3Sb_2相组成。对合金进行430℃×(8～32) h固溶处理,随保温的时间延长,Mg Zn相和β-Mg_(17)Al_(12)相固溶于α-Mg基体;粗大汉字状Mg_2Si相发生球状化;与此同时,合金的室温及高温(150℃)抗拉强度、屈服强度和伸长率逐步提高,硬度逐渐下降。铸态与固溶处理态合金的拉伸断裂形式均呈准解理脆性断裂。
Mg-8Al-1Zn-1 Si-0.6Sb alloy was prepared by gravity casting. The effects of solution treatment on the microstructure and mechanical properties of the alloy were studied. The results show that the cast alloy is mainly composed of a-Mg, P-Mg17Al12, Mg2Si, MgZn and Mg3Sb2 phases. The alloy is treated at 430 ℃ for 8-32 h. With the prolongation of the holding time, the MgZn phase and β-Mg17Al12 phase are dissolved in a-Mg matrix. The spheroidization of bulky Chinese character like Mg2Si phase occurs. At the same time, the tensile strength, yield strength and elongation of the alloy at room and high temperature (150 ℃) increase gradually, and the hardness decrease gradually. The tensile fracture patterns of cast and solution treated alloys are quasi-cleavage brittle fracture.
作者
王玉琴
WANG Yuqin(School of Civil Engineering and Architecture, Shaanxi University of Technology, Hanzhong 723001, China)
出处
《热加工工艺》
北大核心
2019年第4期225-229,共5页
Hot Working Technology
基金
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)
