摘要
采用等径角挤压技术对2A12铝合金在室温下进行挤压,成功制备了亚微米尺度的块体铝合金材料.挤压前材料的平均晶粒尺寸约5μm,两次挤压后,平均晶粒尺寸细化至200nm左右.合金中的Al2Cu相在挤压过程中由针状变成了块状颗粒,而Al2CuMg相在挤压过程中晶粒大小基本不变.研究发现,硬颗粒Al2CuMg对基体α-Al有剪切和割裂作用,可以促进基体的晶粒细化过程,并初步给出了晶粒细化的模型.
The sub -micrometer 2A12 aluminum alloy has been successfully prepared through Equal Channel Angular （ECA） pressing. The average grain size of 2A12 aluminum alloy before pressing is about 5μm. And it turns to 200nm after twice ECA pressing. During the course of pressing, the needle - like Al2 Cu phase turns to block. There is no change of grain size for Al2CuMg phase. It is found that Al2CuMg phase has the effect of shear and cut on α - Al matrix, and that it can accelerate the grain refinement of α - Al matrix. The primary model of grain refinement is presented.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2007年第1期115-117,共3页
Materials Science and Technology
基金
山东省科技攻关项目资助(03205015)
关键词
等径角挤压
第二相粒子
剪切
晶粒细化
equal channel angular pressing
second phase
shear
grain refinement
