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

doi:10.1016/j.jallcom.2022.164187

IMR OpenIR

	Temperature-dependent yield strength and deformation mechanism of a casting Ni-based superalloy containing low volume-fraction gamma ' phase
	Hou, Kunlei 1,2; Wang, Min 1,3; Zhao, Peng 1,2; Ou, Meiqiong 1,3; Li, Haoze 1,3; Ma, Yingche 1,3; Liu, Kui 1,3
通讯作者	Ma, Yingche(ycma@imr.ac.cn) ; Liu, Kui(kliu@imr.ac.cn)
	2022-06-05
发表期刊	JOURNAL OF ALLOYS AND COMPOUNDS
ISSN	0925-8388
卷号	905 页码:10
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.
关键词	Ni-based superalloy Temperature effect Yield strength anomaly Deformation mechanism Orowan looping
资助者	National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; National Major Science and Technology Projects of China
DOI	10.1016/j.jallcom.2022.164187
收录类别	SCI
语种	英语
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
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000779681700003
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：30[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/321006/172825
专题	中国科学院金属研究所
通讯作者	Ma, Yingche; Liu, Kui
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, 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.