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Temperature-dependent yield strength and deformation mechanism of a casting Ni-based superalloy containing low volume-fraction gamma ' phase

文献类型：期刊论文

作者Hou, Kunlei1,2; Wang, Min2,3; Zhao, Peng1,2; Ou, Meiqiong2,3; Li, Haoze2,3; Ma, Yingche2,3; Liu, Kui2,3
刊名JOURNAL OF ALLOYS AND COMPOUNDS
出版日期2022-06-05
卷号905页码:10
ISSN号0925-8388
关键词Ni-based superalloy Temperature effect Yield strength anomaly Deformation mechanism Orowan looping
DOI10.1016/j.jallcom.2022.164187
通讯作者Ma, Yingche(ycma@imr.ac.cn) ; Liu, Kui(kliu@imr.ac.cn)
英文摘要This study investigates the temperature-dependent yield strength and deformation mechanism of a new casting Ni-based superalloy K4750. This alloy exhibits yield strength anomaly (YSA) at 650-750 degrees C though it contains only low volume-fraction gamma ' phase (22%). Using the interrupted samples after ~1.0% plastic strain, the dominant deformation mechanisms at the initial yielding stage are identified as: (i) (anti-phase boundary)APB-coupled dislocation pairs shearing gamma ' from room temperature to 650 degrees C, (ii) dislocations bypassing gamma ' and creating loops above 650 degrees C, and (iii) dislocations overcome gamma ' by the thermally activated cross-slip and local climb at 850 degrees C. Additionally, with the proceeding of deformation, superlattice stacking faults shearing is active above 750 degrees C, implying that the deformation mechanism changes as the deformation progresses. According to the theoretical calculation, the critical resolved shear stress of Orowan looping decreases faster than APB shearing with the temperature increase, which is in agreement with the observed transition of deformation mechanism. Moreover, the remaining loops hinder the movement of subsequent dislocations, resulting in severe dislocation entanglement and high dislocation density in the heterogeneous slip bands, contributing to YSA. By contrast, dislocations can easily surmount gamma ' phase by cross-slip and climb at 850 degrees C, leading to a rapid degradation of yield strength.(c) 2022 Elsevier B.V. All rights reserved.
资助项目National Natural Science Foundation of China[52001314] ; China Postdoctoral Science Foundation[2020M671403] ; National Major Science and Technology Projects of China[J2019-VI-0004-0118] ; National Major Science and Technology Projects of China[J2019-VII-0002-0142]
WOS研究方向Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
出版者ELSEVIER SCIENCE SA
WOS记录号WOS:000779681700003
资助机构National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; National Major Science and Technology Projects of China
源URL[http://ir.imr.ac.cn/handle/321006/172824]  
专题金属研究所_中国科学院金属研究所
通讯作者Ma, Yingche; Liu, Kui
作者单位1.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
3.IMR NMSA, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China
推荐引用方式
GB/T 7714		 Hou, Kunlei,Wang, Min,Zhao, Peng,et al. Temperature-dependent yield strength and deformation mechanism of a casting Ni-based superalloy containing low volume-fraction gamma ' phase[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2022,905:10.
APA Hou, Kunlei.,Wang, Min.,Zhao, Peng.,Ou, Meiqiong.,Li, Haoze.,...&Liu, Kui.(2022).Temperature-dependent yield strength and deformation mechanism of a casting Ni-based superalloy containing low volume-fraction gamma ' phase.JOURNAL OF ALLOYS AND COMPOUNDS,905,10.
MLA Hou, Kunlei,et al."Temperature-dependent yield strength and deformation mechanism of a casting Ni-based superalloy containing low volume-fraction gamma ' phase".JOURNAL OF ALLOYS AND COMPOUNDS 905(2022):10.

入库方式： OAI收割

来源：金属研究所

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