A dramatic decrease of the dislocation velocity in Ni3Al single crystals under the influence of hydrogen

被引：7
|
作者：
Jiang, CB
Li, H
Tan, J
Wu, SD
Rong, LJ
Patu, S
机构：
[1] Chinese Acad Sci, Met Res Inst, State Key Lab Fatigue & Fracture Mat, Shenyang 110016, Peoples R China
[2] Chinese Acad Sci, Met Res Inst, State Key Lab Rapidly Solidified Nonequilibrium A, Shenyang 110016, Peoples R China
来源：
INTERMETALLICS | 2001年 / 9卷 / 04期
基金：
中国国家自然科学基金;
关键词：
nickel aluminides; based on Ni3Al; hydrogen embrittlement; defects : dislocation geometry and arrangement;
D O I：
10.1016/S0966-9795(01)00012-7
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effect of hydrogen on the average dislocation velocities in Ni3Al single crystals has been investigated by the etch-pit technique. It is found that the velocity is dramatically decreased by the charged high content of hydrogen and that the tension/compression asymmetry of the dislocation velocity is reversed. Detailed observation of the dislocation structure indicates that the motion of edge superkinks is seriously inhibited by hydrogen solutes. These results serve as a strong evidence for the mechanism of hydrogen strengthening in metals. The interaction between the solute H and the edge dislocations also throws a sidelight on the role of kinks in the flow stress anomaly in Ni3Al. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：355 / 360
页数：6
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