期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 69, 期 -, 页码 22-27出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2013.01.015
关键词
Superalloys; Thermomechanical fatigue; Deformation twin; Crack paths; Dislocations
资金
- MKE (Ministry of Knowledge Economy) [UCN215-2846.C]
- Changwon National University
- National Research Foundation of Korea (NRF) - MEST (Ministry of Education, Science and Technology) [2012-0009451]
The deformation and damage mechanisms of a single crystal nickel-based superalloy CMSX-4 have been investigated under out-of-phase thermomechanical fatigue (OP TMF) condition. The deformation was highly localized to the area near the crack tip, where multiple groups of parallel twin plates on {111) planes formed during the high temperature-compressive half cycle. The atomistic a/6 < 112 > twinning shear-based approach is presented which explains the origin of twinning. The localized twins provided a preferential path for crack propagation. OP TMF deformation was dominated by partial dislocation movement with {111}< 112 > slip system, resulting in the formation and propagation of deformation twins. (C) 2013 Elsevier Ltd. All rights reserved.
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