Effects of stacking fault energy on the creep behaviors of Ni-base superalloy

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	Effects of stacking fault energy on the creep behaviors of Ni-base superalloy
	C. G. Tian; G. M. Han; C. Y. Cui; X. F. Sun
	2014
发表期刊	Materials & Design
ISSN	0261-3069
卷号	64 页码:316-323
摘要	Cobalt in a 23 wt.% Co containing Ni-base superalloys was systematically substituted by Ni in order to study the effects of stacking fault energy (SFE) on the creep mechanisms. The deformation microstructures of the alloys during different creep stages at 725 degrees C and 630 MPa were investigated by transmission electron microscopy (TEM). The results showed that the creep life increased as the SFE decreased corresponding to the increase of Co content in the alloys. At primary creep stage, the dislocation was difficult to dissociate independent of SFE. In contrast, at secondary and tertiary creep stages the dislocations dissociated at gamma/gamma' interface and the partial dislocation started to shear gamma' precipitates, leaving isolated faults (IFs) in high SFE alloy, while the dislocations dissociated in the matrix and the partials swept out the matrix and gamma' precipitates creating extended stacking faults (ESFs) or deformation microtwins which were involved in diffusion-mediated reordering in low SFE alloy. It is suggested that the deformation microtwinning process should be favorable with the decrease of SFE, which could enhance the creep resistance and improve the creep properties of the alloys. (C) 2014 Elsevier Ltd. All rights reserved.
部门归属	[tian, chenggang ; han, guoming ; cui, chuanyong ; sun, xiaofeng] chinese acad sci, inst met res, superalloys div, shenyang 110016, peoples r china. ; cui, cy (reprint author), chinese acad sci, inst met res, superalloys div, shenyang 110016, peoples r china. ; chycui@imr.ac.cn
关键词	Superalloy Stacking Fault Energy Isolated Fault Extended Stacking Fault Microtwin Single-crystal Superalloys Cu-al Alloys Intermediate Temperature Mechanical-properties Matrix Dislocations Disc Superalloy Heat-treatment Gamma-phase Grain-size Deformation
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73390
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	C. G. Tian,G. M. Han,C. Y. Cui,et al. Effects of stacking fault energy on the creep behaviors of Ni-base superalloy[J]. Materials & Design,2014,64:316-323.
APA	C. G. Tian,G. M. Han,C. Y. Cui,&X. F. Sun.(2014).Effects of stacking fault energy on the creep behaviors of Ni-base superalloy.Materials & Design,64,316-323.
MLA	C. G. Tian,et al."Effects of stacking fault energy on the creep behaviors of Ni-base superalloy".Materials & Design 64(2014):316-323.