摘要
Asymmetric rolling(ASR), as one of severe plastic deformation(SPD) methods, was widely used to make ultra-fined materials with enhanced performance. Internal marks were used to show the shear deformation during asymmetric rolling with pure aluminium as a model material. Effects of reduction ratio and mismatch ratio on the shear deformation were studied. With the observed shear deformation results, equivalent strain was calculated. For lager shear deformation, rolling equipment was modified to increase friction between specimen and the rollers. Consequently, extremely fine grains with size of 500 nm are obtained in pure aluminium. With improved asymmetric rolling, the ability of grain refinement of ASR is greatly improved.
Asymmetric rolling（ASR）, as one of severe plastic deformation（SPD） methods, was widely used to make ultra-fined materials with enhanced performance. Internal marks were used to show the shear deformation during asymmetric rolling with pure aluminium as a model material. Effects of reduction ratio and mismatch ratio on the shear deformation were studied. With the observed shear deformation results, equivalent strain was calculated. For lager shear deformation, rolling equipment was modified to increase friction between specimen and the rollers. Consequently, extremely fine grains with size of 500 nm are obtained in pure aluminium. With improved asymmetric rolling, the ability of grain refinement of ASR is greatly improved.
出处
《中国有色金属学会会刊：英文版》
EI
CSCD
2008年第4期774-777,共4页
Transactions of Nonferrous Metals Society of China
基金
Project(5067062) supported by the National Natural Science Foundation of China
Project(NCET-04-0386) supported by New Century Scholarship of the Ministry of Education of China
关键词
铝
剪切变形
不对称旋转
等效应变
晶粒细化
asymmetric rolling
shear deformation
pure aluminum
equivalent strain
