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Tensile behaviors and deformation mechanisms of a nickel-base single crystal superalloy at different temperatures
X. G. Wang; J. L. Liu; T. Jin; X. F. Sun
2014
Source PublicationMaterials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN0921-5093
Volume598Pages:154-161
AbstractThe tensile behaviors of an experimental nickel-base single crystal superalloy have been studied from room temperature to 1100 degrees C. Obvious work hardening during the tensile tests from room temperature to 760 degrees C has been observed. In contrast, at 900 degrees C and 1000 degrees C only a slight work hardening occurs. Furthermore, by using transmission electron microscopy (TEM), the microstructures of the alloy after tensile tests at various temperatures have been investigated. Detailed analysis demonstrates the stacking faults (SFs) presented in the gamma matrix at room temperature, 600 degrees C and 760 degrees C, which were seldom reported previously. These stacking faults are responsible for the appearance of stress jump (named steps) on the stress-strain curves. On the other hand, these stacking faults effectively prevent slipping of the dislocations and have a great contribution to work hardening. Apart from that, the stacking faults in gamma' precipitates from room temperature to 900 degrees C have also been observed. The interfacial dislocation networks at 1000 degrees C and 1100 degrees C cause a weak resistance to the slip dislocations because of the high flow stress. The a/3 < 121 > and a/2 (< 011 > type dislocations are of vital importance for plastic deformation and rupture of the experimental alloy. At last, the relation between deformation mechanisms and tensile behaviors has been reasonably explained. (C) 2014 Elsevier B.V. All rights reserved.
description.department[wang, x. g. ; liu, j. l. ; jin, t. ; sun, x. f.] chinese acad sci, inst met res, superalloys div, shenyang 110016, peoples r china. ; jin, t (reprint author), chinese acad sci, inst met res, superalloys div, shenyang 110016, peoples r china. ; tjin@imr.ac.cn
KeywordTensile Behaviors Stress Jump Dislocation Structure Stacking Faults Single Crystal Superalloy w Solid-solutions Creep-behavior Gamma'-phase Volume Fraction Stacking-faults Dependence Alloys Stress Metals
URL查看原文
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/72923
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
X. G. Wang,J. L. Liu,T. Jin,et al. Tensile behaviors and deformation mechanisms of a nickel-base single crystal superalloy at different temperatures[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2014,598:154-161.
APA X. G. Wang,J. L. Liu,T. Jin,&X. F. Sun.(2014).Tensile behaviors and deformation mechanisms of a nickel-base single crystal superalloy at different temperatures.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,598,154-161.
MLA X. G. Wang,et al."Tensile behaviors and deformation mechanisms of a nickel-base single crystal superalloy at different temperatures".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 598(2014):154-161.
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