| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1573519 | Materials Science and Engineering: A | 2016 | 6 Pages |
Abstract
In order to directly investigate the grain boundary (GB) hydrogen embrittlement in polycrystalline materials, a novel micro-mechanical testing method was developed. By combining a site-specific sampling technique and a high-voltage environmental transmission electron microscope (HV ETEM), the fracture property of micro-cantilever specimens fabricated from the same GB in a nickel-aluminide (Ni3Al) polycrystal was critically compared in environments with/without hydrogen (H2) gas. For randomly oriented GBs, brittle fracture nucleation accompanied by plastic deformation was observed in a H2-containing environment except for ones with small orientation difference. No GB fracture was observed for coherent Σ3 boundaries. It also appeared that the similitude of the hydrogen-enhanced decohesion (HEDE) mechanism was still valid even for the submicron-scale specimens.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Yoshimasa Takahashi, Hikaru Kondo, Ryo Asano, Shigeo Arai, Kimitaka Higuchi, Yuta Yamamoto, Shunsuke Muto, Nobuo Tanaka,