Analysis of mechanical properties of bulk nanostructured metals by large-scale computing on the defects evolution

2014 Fiscal Year Final Research Report

• Project Area: Bulk Nanostructured Metals -New Metallurgy of Novel Structural Materials
• Project/Area Number: 22102007
• 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: Kanazawa University
• Principal Investigator: SHIMOKAWA Tomotsugu 金沢大学, 機械工学系, 准教授 (40361977)
• Co-Investigator(Kenkyū-buntansha): AOYAGHI Yoshiteru 東北大学, 工学研究科, 准教授 (70433737) ; TSURU Tomohito 独立行政法人日本原子力研究開発機構, 原子力基礎工学研究部門, 研究員 (80455295)
• Project Period (FY): 2010-04-01 – 2015-03-31
• Keywords: 計算力学 / 力学特性 / ナノ材料 / 粒界 / 原子シミュレーション / 結晶塑性解析 / 寸法効果 / 転位

Outline of Final Research Achievements

In bulk nanostructured metals, the volume fraction of grain boundary and interface (plane defects) rapidly increases. Thus, it is very important to investigate the development of lattice defects through grain boundaries, which is closely related with the anomalous mechanical characteristics of BNMs. In this study, the development of
complicated interior lattice defects in BNMs was expressed by the large-scale calculation by the atomistic model which can directly express atomic structure of grain boundary (molecular dynamics) and the continuum modeling considering the effect of grain boundaries (crystal plasticity theory), and we investigated the grain size dependence of the following phenomena: (1) dislocation emissions from grain boundaries, (2) the crack tip plasticity based on the interaction between dislocations and grain boundaries, and (3) the propagation mechanism of the plastic deformation based on the formation and dissipation of lattice defects.

Free Research Field

計算材料力学