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2017 Fiscal Year Final Research Report

Multiplication process of dislocations at a crack tip revealed by using HVEM tomography.

Research Project

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Project/Area Number 15H04147
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Structural/Functional materials
Research InstitutionKyushu University

Principal Investigator

Tanaka Masaki  九州大学, 工学研究院, 准教授 (40452809)

Co-Investigator(Kenkyū-buntansha) 森川 龍哉  九州大学, 工学研究院, 助教 (00274506)
東田 賢二  九州大学, 工学研究院, 教授 (70156561)
Project Period (FY) 2015-04-01 – 2018-03-31
Keywords転位 / 破壊 / 亀裂
Outline of Final Research Achievements

The structure of crack tip dislocations in a micro-cantilever specimen were investigated after bending tests. The micro-cantilever was machined in a grain which is in a fully annealed high nitrogen austenitic stainless steel. A notch was introduced at the root of the cantilever by using focused ion beam, then bending load was applied at the edge of the cantilever using s nano-indenter. The state of stress at the notch tip was investigated using finite element method. High-voltage electron microscopy observation revealed dislocation arrays on the slip plane on which the resolved shear stress is the highest, and cross slip of dislocations.

Free Research Field

結晶塑性学

URL: 

Published: 2019-03-29  

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