OS0316 Mg_<12>ZnY長周期相の塑性変形機構,Mg合金強化機構(非立方晶型金属材料の変形現象とそのモデル化,オーガナイズドセッション)

概要

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Recently, the role of the strengthening phase with a long-period stacking ordered (LPSO) structure is focused for development of high-strength Mg alloys. In this study, the plastic deformation behavior of Mg_<12>ZnY with 18R LPSO-stnicture was investigated and the strengthening mechanism of the Mg/LPSO two-phase alloys was discussed. The (0001)<1120> basal slip was identified to be the dominant operative deformation mode in the LPSO phase, and deformation kinks were initiated to accommodated the compressive strain. The results showed that the plastic behavior of LPSO-phase is highly anisotropic. The existence of LPSO-phase in Mg alloys induces the grain refmement of Mg matrix grains dunng extrusion. In addition, it effectively acts as a fiber-like strengthening phase in deformation along the extruded direction.
一般社団法人日本機械学会の論文
2009-07-24