AZ31镁合金铸轧和常规轧制板拉伸变形的组织演变  

Microstructural Evolution of Cast-rolling and Normal Rolling AZ31 Magnesium Alloy Sheet

作　　者：赵虎[1] 何良菊[1] 李培杰[1] 

机构地区：[1]清华大学机械工程系、中俄轻金属材料国际合作研发中心

出　　处：《特种铸造及有色合金》2009年第3期217-219,共3页Special Casting & Nonferrous Alloys

摘　　要：采用Gleebe-1500D热模拟试验机对AZ31镁合金铸轧板和常规轧制板进行了等温拉伸试验,变形温度为150～400℃,应变速率为3×10-4～3×10-1s-1。研究了AZ31镁合金铸轧板和常规轧制板在不同变形条件下的组织演变。结果表明,两种板低温变形后的组织主要包括被拉长和破碎的晶粒以及孪晶。随着变形温度的升高,AZ31镁合金开始发生动态再结晶。铸轧板高温低应变速率变形条件下晶界滑移引起的空洞尺寸、体积分数和密度均大于常规轧制板。再结晶晶粒尺寸和参数Z呈幂律关系。Isothermal tensile of cast-rolling and normal rolling AZ31 magnesium alloy sheet was tested on the Gleeble 1500D hot simulator with strain rate of 0.3～0.0003 s-1 at 150～400 ℃ to observe microstructural evolution.The results indicate that microstructure of AZ31 magnesium alloy mainly consists of elongated and broken grains and twins at the low temperature deformation.With increasing in temperature,recrystallization occurs and grain size is coarsened in the microstructure of cast-rolling and normal rolling AZ31 magnesium alloy sheets.Cavity size,volume fraction and density of cast-rolling sheet caused by grain boundary sliding under the deformation condition of high temperature and low strain are higher than those of normal rolling ones,while dynamic recrystallization grain sizes are less than that of normal rolling ones.Dynamic recrystallization grain size has a power law relation with Z parameters.

关 键 词：AZ31镁合金 铸轧 等温拉伸 组织 

分 类 号：TG27[金属学及工艺—铸造] TG339