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.
出处
《中国有色金属学会会刊：英文版》
EI
CSCD
2007年第1期104-109,共6页
Transactions of Nonferrous Metals Society of China
关键词
铝合金
变形行为
微观结构
晶界滑动
aluminum alloys
impact test
equal-channel angular pressing（ECAP）
microstructures
deformation mechanism
grainboundary sliding
