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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; 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.
2017-01-05
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume690Pages:707-715
AbstractAlthough 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.; 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.
description.department[cai, yulong ; yang, suli ; fu, shihua ; zhang, qingchuan] univ sci & technol china, cas key lab mech behav & design mat, hefei 230027, peoples r china ; [tian, chenggang ; han, guoming] avic commercial aircraft engine co ltd, shanghai 201108, peoples r china ; [zhang, guoliang ; cui, chuanyong] chinese acad sci, inst met res, superalloy div, shenyang 110016, peoples r china
KeywordGamma ' Precipitates Critical Strain Ni-based Superalloy Dynamic Strain Aging Portevin-le Chatelier Effect
Subject AreaChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China (NSFC) [11332010, 51271174, 11428206, 11372300]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78352
Collection中国科学院金属研究所
Corresponding AuthorZhang, 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.
Recommended Citation
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.,...&Cui, CY .(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.
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