Deformation mechanism at impact test of Al-11% Si alloy processed by equal-channel angular pressing with rotary die  

作　　者：马爱斌 Y. NISHIDA 江静华 N. SAITO I. SHIGEMATSU A. WATAZU 

机构地区：[1]Department of Materials Science and Engineering,Hohai University [2]National Institute of Advanced Industrial Science and Technology,Shimoshidami,Moriyama-ku

出　　处：《中国有色金属学会会刊：英文版》2007年第1期104-109,共6页Transactions of Nonferrous Metals Society of China

摘　　要：Al-11%Si(mass fraction)alloy was transformed into a ductile material by equal-channel angular pressing(ECAP)with a rotary die.Two mechanisms at impact test,slip deformation by dislocation motion and grain boundary sliding,were discussed.The ultrafine grains with modified grain boundaries and the high content of fine particles(<1μm)were necessary for attaining high absorbed energy.The results contradict the condition of slip deformation by dislocation motion and coincide with that of grain boundary sliding.Many fine zigzag lines like a mosaic were observed on the side surface of the tested specimens.These observed lines may show grain boundaries appeared by the sliding of grains.Al-11%Si （mass fraction） alloy was transformed into a ductile material by equal-channel angular pressing （ECAP） with a rotary die. Two mechanisms at impact test, slip deformation by dislocation motion and grain boundary sliding, were discussed. The ultrafine grains with modified grain boundaries and the high content of fine particles （〈 1μm） were necessary for attaining high absorbed energy. The results contradict the condition of slip deformation by dislocation motion and coincide with that of grain boundary sliding. Many fine zigzag lines like a mosaic were observed on the side surface of the tested specimens. These observed lines may show grain boundaries appeared by the sliding of grains.

关 键 词：铝合金 变形行为 微观结构 晶界滑动 

分 类 号：TG376[金属学及工艺—金属压力加工]