姜雁斌,官磊,莫永达

• 1:北京科技大学新材料技术研究院材料先进制备技术教育部重点实验室
• 2:北京航空材料研究院

摘要(Abstract)：

研究了电脉冲连续退火对冷轧时效态AZ91镁合金带材显微组织和力学性能的影响。结果表明:电脉冲退火在较低的温度下快速完成了α-Mg基体的再结晶,可显著细化晶粒。当退火温度为210℃时,α-Mg基体发生完全再结晶,其平均晶粒尺寸由冷轧态的约30μm减小为约7μm,带材的抗拉强度由冷轧态的410 MPa减小至334 MPa,断后伸长率由冷轧态的3.7%增大至23%。电脉冲退火后带材的拉伸断裂方式由冷轧态的脆性沿晶断裂转变为韧性穿晶断裂。电脉冲在其热效应和非热效应的共同作用下快速完成再结晶过程以及β-Mg17Al12相阻碍α-Mg基体晶粒长大,是电脉冲退火细化晶粒的主要原因。

关键词(KeyWords)： 镁合金;电脉冲退火;再结晶;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51104016);; 稀贵金属综合利用新技术国家重点实验室开放课题资助(SKL-SPM-201204)

作者(Author): 姜雁斌,官磊,莫永达

DOI: 10.13289/j.issn.1009-6264.2015.03.025

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