Deformation mechanism at impact test ofAl-11% Si alloy processed by equal-channelangular pressing with rotary die

来源期刊：中国有色金属学报(英文版)2007年第1期

论文作者：马爱斌 Y. NISHIDA 江静华 N. SAITO I. SHIGEMATSU A. WATAZU

文章页码：104 - 104

Key words：aluminum alloys; impact test; equal-channel angular pressing(ECAP); microstructures; deformation mechanism; grain boundary sliding

Abstract: 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 (＜1 μm) 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