Influence of gamma ' precipitates on the critical strain and localized deformation of serrated flow in Ni-based superalloys

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	Influence of gamma ' precipitates on the critical strain and localized deformation of serrated flow in Ni-based superalloys
	Cai, Yulong ; Tian, Chenggang ; Zhang, Guoliang ; Han, Guoming ; Yang, Suli ; Fu, Shihua ; Cui, Chuanyong ; Zhang, Qingchuan
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2017-01-05
卷号	690 页码:707-715
关键词	gamma ' precipitates Critical strain Ni-based superalloy Dynamic strain aging Portevin-Le Chatelier effect
ISSN号	0925-8388
通讯作者	Zhang, Q (reprint author), Univ Sci & Technol China, CAS Key Lab Mech Behav & Design Mat, Hefei 230027, Peoples R China. ; Cui, CY (reprint author), Chinese Acad Sci, Inst Met Res, Superalloy Div, Shenyang 110016, Peoples R China.
中文摘要	Although gamma' precipitates enhance the strength of Ni-based superalloys, they can also promote an undesirable phenomenon called the Portevin-Le Chatelier (PLC) effect. Alloys designed and fabricated with various gamma' contents were subjected to uniaxial tensile tests at different temperatures (523-923 K) and strain rates (1 x 10(-4)-3 x 10(-3) s(-1)). It was found that the gamma' precipitates facilitated a transition of the PLC effect from normal to inverse behavior. From the viewpoint of the critical strain, the temperature transition region shifted to low temperatures with increasing gamma' content. Digital image correlation was applied to the observations of the localization band in relation to the gamma' content at 773 K and 1 x 10(-4) s(-1). Surface strain mapping indicated that severe localized deformation was accompanied by high-amplitude serrations. Microscopic observations from transmission electron microscopy indicated that the deformation mode switched from dislocation motion to stacking fault (SF) formation with increasing gamma' content. With the aid of Suzuki segregation and SF intersections of different slip planes, a large number of SFs might induce high-amplitude serrations, especially those associated with the inverse PLC effect. (C) 2016 Elsevier B.V. All rights reserved.
学科主题	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
收录类别	SCI
资助信息	National Natural Science Foundation of China (NSFC) [11332010, 51271174, 11428206, 11372300]
语种	英语
公开日期	2017-08-17
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/78352]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	Cai, Yulong,Tian, Chenggang,Zhang, Guoliang,et al. Influence of gamma ' precipitates on the critical strain and localized deformation of serrated flow in Ni-based superalloys[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2017,690:707-715.
APA	Cai, Yulong.,Tian, Chenggang.,Zhang, Guoliang.,Han, Guoming.,Yang, Suli.,...&Zhang, Qingchuan.(2017).Influence of gamma ' precipitates on the critical strain and localized deformation of serrated flow in Ni-based superalloys.JOURNAL OF ALLOYS AND COMPOUNDS,690,707-715.
MLA	Cai, Yulong,et al."Influence of gamma ' precipitates on the critical strain and localized deformation of serrated flow in Ni-based superalloys".JOURNAL OF ALLOYS AND COMPOUNDS 690(2017):707-715.