ミルフィーユ構造を模擬したMg-Al共晶ラメラ合金の塑性変形挙動

抄録

Mg-based LPSO phase is known to contribute to increase in both of strength and ductility of Mg alloys. As a deformation mode in the LPSO phase, kink-band formation is recently focused. In the present state, however, its formation criteria have not yet been clarified. According to the study on the LPSO phase, its unique crystal structure which is constructed by the alternative stacking of soft and hard layers, called mille-feuille structure, are supposed as plausible factors to govern the formation of deformation kink bands. To confirm these assumptions, in this paper we examined the deformation behavior of directionally solidified Mg/Mg₁₇Al₁₂ eutectic alloy with lamellar microstructure as a model material.

As a result, kink band formation was indeed confirmed when stress was applied parallel to the lamellar interface. The present results give a new insight to develop the noble strategy for the aggressive usage of deformation kink band to improve the mechanical properties of the materials.