非对称轧制AZ31镁合金板材组织与性能  

Microstructure and Mechanical Properties of AZ31 Magnesium Alloy Sheet Processed by Asymmetry Rolling

作　　者：宋广胜[1] 姜敬前 陈帅峰 张士宏[2] 

机构地区：[1]沈阳航空航天大学,辽宁沈阳110036 [2]中国科学院金属研究所,辽宁沈阳110016

出　　处：《稀有金属材料与工程》2017年第11期3512-3517,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(5077521;51174189)

摘　　要：采用商用连铸连轧AZ31镁合金板材,通过小辊径非对称轧制工艺,研究在150,200,250℃温度条件下多道次非对称轧制对镁合金板材组织、织构和力学性能的影响。结果表明,不同轧制温度下,镁合金板材的晶粒细化机理不同,150℃时以孪晶细化为主,部分晶粒发生动态再结晶,200和250℃时板材晶粒细化机理为动态再结晶。对比分析了对称轧制和非对称轧制板材织构演化规律,随着轧制温度的升高,非对称轧制板材基面织构依次增强,但明显低于对称轧制板材。The commercial twin-roll cast AZ31 magnesium alloy sheet was used. Multi-pass asymmetry rolling（ASR） was conducted on the sheet by small diameter rollers ASR at temperatures of 150, 200 and 250 °C, and the effect of ASR on the microstructure, texture and mechanical properties of the rolled magnesium alloy sheet was investigated. The results indicate that the mechanism of grain refinement is totally different at various temperatures： the grains are segmented into sub-grains by twins at 150 °C; meanwhile, the dynamic recrystallization（DRX） is the main grain refinement mechanism at 200 and 250 °C. The texture evolution of the symmetry rolling（SR）and ASR sheet were analyzed. It predicts that the texture intensity of ASR sheet increases with rolling temperature elevating, but they are obviously lower than the texture intensity of SR sheet.

关 键 词：AZ31镁合金 非对称轧制 晶粒细化 织构 

分 类 号：TG146.22[一般工业技术—材料科学与工程]