抄録
Magnesium alloys are considered to be one of the most promising materials in the industry application, for example in the automobile usage, due to their significantly low specific weight. Much study efforts were done mainly from the materials science society to develop strong yet ductile alloys at ambient and elevated temperatures. Recently, a series of new alloys which consist of Mg-TM-RE were developed where TM and RE represent transition metals and rare earth elements, respectiely. The microstructure consists of fine particles of LPSO (long - period - stacking - ordered) phase embedded in a-phase of magnesium. After extrusion of cast alloys, the LPSO phase shows a typical aspect of "kinked" shape and this character is considered to be a key issue in realization of their high strength and ductility. We attempted to understand the mechanism of kink formation in LPSO phase from the view point of non-uniform slip deformation and accumulation of the geometrically necessary dislocations. In this communication, concepts of crystal plasticity analysis for this kind of alloys are introduced and some analysis results for the process of kink deformation in single crystal model of LPSO phase are shown.
