Study on the deformation process and macroscopic mechanical response of LPSO structures by multiscale computational mechanics

2015 Fiscal Year Final Research Report

• Project Area: Materials Science of synchronized LPSO structure -Innovative Development of Next-Generation Lightweight Structural Materials-
• Project/Area Number: 23109009
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Kitami Institute of Technology
• Principal Investigator: Ohashi Tetsuya 北見工業大学, 工学部, 教授 (80312445)
• Co-Investigator(Kenkyū-buntansha): SHIZAWA Kazuyuki 慶應義塾大学, 理工学部, 教授 (80211952) ; MATSUMOTO Ryosuke 京都大学, 工学(系)研究科(研究院), 講師 (80363414)
• Co-Investigator(Renkei-kenkyūsha): MAYAMA Tsuyoshi 熊本大学, 工学部, 准教授 (40333629)
• Project Period (FY): 2011-04-01 – 2016-03-31
• Keywords: キンク変形 / すべり変形 / 転位 / 回位 / 初期不均一性 / マルチスケール解析 / 結晶塑性解析 / 原子シミュレーション

Outline of Final Research Achievements

Strength and ductility of Mg/LPSO alloys are significantly improved after extrusion process. Crystal orientation of the LPSO phase was aligned and kink deformation was observed after the extrusion. In this study, we examined the process of kink deformation and macroscopic mechanical responses of the LPSO phase material by molecular dynamics simulation and crystal plasticity analyses.
Results show that slip deformation on basal system develops from initial inhomogeneities and grows into a band shaped deformation pattern of kink. Strain hardening and geometric softening of slip deformation were shown to control the extent and pattern of kinking. It was also shown that the deformation anisotropy of LPSO phase was suppressed by kinking and this was assumed to contribute toward the improved strength and ductility of the extruded Mg/LPSO alloys.

Free Research Field

材料力学