期刊
SCRIPTA MATERIALIA
卷 190, 期 -, 页码 131-135出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.08.036
关键词
Creep; Copper alloys; Thermally activated processes; Dislocation structure; Dislocation-particle interaction
类别
资金
- National Aeronautics and Space Administration Glenn Research Center at Lewis Field (NASA GRC, Cleveland, Ohio) [NCC3-859]
The stress reduction creep tests on a Cu-Cr-Nb alloy at 923 K revealed local dislocation climb as the rate-controlling deformation mechanism, with an activation energy consistent with self-diffusion in the Cu matrix. An internal back stress of approximately -9 MPa was found to act on the rate-controlling dislocations, believed to be the sum of interaction between dislocations and particles, as well as dislocations themselves. However, this back stress does not lead to a true threshold in thermally activated dislocation motion.
Stress reduction creep tests conducted on a Cu-Cr-Nb alloy (GRCop-84) at 923 K have confirmed local dislocation climb to be the rate-controlling deformation mechanism. The activation energy of creep was measured to be consistent with that of self-diffusion in Cu matrix. An internal back stress of approximately -9 MPa was identified to act on the rate-controlling dislocations, which is believed to be the sum of the back stress for dislocation-particle interaction and the forward stress for dislocation-dislocation interaction. This back stress, however, does not lead to a true threshold in the framework of thermally activated dislocation motion. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据