Study of deformation mechanism and mechanical properties of layered solids based on collaboration between mathematical morphology and hierarchical structural science

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: 23109010
• 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: Osaka University
• Principal Investigator: NAKATANI AKIHIRO 大阪大学, 工学(系)研究科(研究院), 教授 (50252606)
• Co-Investigator(Kenkyū-buntansha): NAKASHIMA Hideharu 九州大学, 大学院総合理工学研究院, 教授 (80180280)
• Co-Investigator(Renkei-kenkyūsha): DOI Yusuke 大阪大学, 大学院工学研究科, 准教授 (10403172) ; IKEDA Ken-ichi 北海道大学, 大学院工学研究院, 准教授 (20335996)
• Research Collaborator: LEI Xiao-Wen 福井大学, 学術研究院工学系部門, 講師 (50726148) ; GAO Hongye 九州大学, 大学院工学研究院, 特任准教授 (60467884)
• Project Period (FY): 2011-04-01 – 2016-03-31
• Keywords: 材料力学 / 格子欠陥 / 構造・機能材料 / 透過型電子顕微鏡 / 変形体力学 / 計算力学 / 非線形力学

Outline of Final Research Achievements

To reveal the origin of the superior mechanical properties of magnesium alloys with syncronized long-period-stacking-ordered (LPSO) structure, the temporal behavior of kink deformation bands are studied. We have developed theoretical and computational models based on disclination and instability, and have showed a full compatibility condition for an ideal kink deformation in the framework of finite deformation theory. Moreover, microstructures of kink boundaries of LPSO phases of Mg-Zn-Y alloy
have been observed. We have examined the characteristics for a variety of kink boundaries using a field-emission transmission electron microscope (TEM), high-angle annular dark-field (HAADF) scanning transmission electron microscope (STEM) and related equipment. The experimental result has showed that the kink boundaries consist of a large number of dislocation array and it agrees well with the theoretical prediction based on disclination model.

Free Research Field

変形体力学