Dislocation Structure in a Single Crystal Nickel Base Superalloy During High Cycle Fatigue at 870 degrees C

IMR OpenIR

	Dislocation Structure in a Single Crystal Nickel Base Superalloy During High Cycle Fatigue at 870 degrees C
	Shui Li 1; Xu Yunchao 1; Hu Zhuangqi 2
通讯作者	Shui Li(shuilisy@163.com)
	2018-04-01
发表期刊	RARE METAL MATERIALS AND ENGINEERING
ISSN	1002-185X
卷号	47 期号:4 页码:1054-1058
摘要	Dislocation structure and its impact on the mechanical behavior of a gamma' strengthened nickel base single crystal alloy under high cycle fatigue (HCF) at 870 degrees C was studied. The results indicate that HCF lifetime declines with increase of applied stress amplitude. In the early stages, the fatigue deformation occurs by forced bowing of dislocations through the narrow gamma matrix channels on {111} planes. During mid-term fatigue stages, most of the dislocations formed in the matrix are located in the gamma/gamma' interfaces, whose intersection and reaction produce new dislocation segments and three-dimensional dislocation networks. The Burgers vectors of the dislocations in the network are 1/2<110>. The interaction of cyclic stress with high temperature induces the precipitation of homogeneous globular gamma' particles, which is beneficial to fatigue strength. At the end of fatigue test, the cyclic stress leads to the formation of persistent slip bands moving through the gamma matrix channels and gamma' particles. Dislocation shearing through the gamma'phase is found occasionally. The extrinsic stacking faults is also observed.
关键词	nickel base single crystal superalloy high cycle fatigue dislocation
资助者	National Natural Science Foundation of China
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[50171045]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000431601500006
出版者	NORTHWEST INST NONFERROUS METAL RESEARCH
引用统计	被引频次：4[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/128040
专题	中国科学院金属研究所
通讯作者	Shui Li
作者单位	1.Shenyang Ligong Univ, Shenyang 110159, Liaoning, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Shui Li,Xu Yunchao,Hu Zhuangqi. Dislocation Structure in a Single Crystal Nickel Base Superalloy During High Cycle Fatigue at 870 degrees C[J]. RARE METAL MATERIALS AND ENGINEERING,2018,47(4):1054-1058.
APA	Shui Li,Xu Yunchao,&Hu Zhuangqi.(2018).Dislocation Structure in a Single Crystal Nickel Base Superalloy During High Cycle Fatigue at 870 degrees C.RARE METAL MATERIALS AND ENGINEERING,47(4),1054-1058.
MLA	Shui Li,et al."Dislocation Structure in a Single Crystal Nickel Base Superalloy During High Cycle Fatigue at 870 degrees C".RARE METAL MATERIALS AND ENGINEERING 47.4(2018):1054-1058.