Assessing the critical role of Re and Co addition in flow stress of Ni-based single-crystal superalloy: A molecular dynamics study

doi:10.1016/j.mtcomm.2022.103296

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Assessing the critical role of Re and Co addition in flow stress of Ni-based single-crystal superalloy: A molecular dynamics study
	Liu, Shu-Lan 1,2; Yang, Hui-Jing 2
刊名	MATERIALS TODAY COMMUNICATIONS
	2022-06-01
卷号	31 页码:8
关键词	Ni-based superalloy Molecular dynamics Flow stress Strengthening mechanism
DOI	10.1016/j.mtcomm.2022.103296
通讯作者	Yang, Hui-Jing(yanghj619@126.com)
英文摘要	Molecular dynamics simulations are conducted to study the effect of Re and Co addition in the Ni-based single-crystal superalloys on its flow stresses under varying temperature. It is found that Re and Co increase the flow stresses of the superalloys at 100, 300 and 500 K, respectively. The solid solution strengthening mechanism is enhanced with the addition of Re or Co atoms. Moreover, Re or Co promote dislocation nucleation and multiplication and, thus, increase the dislocation density which increases the possibility of forest dislocation interactions. The dislocation proliferation increases additional work hardening capability of the superalloy. At atomic scale, the 1/6<110> stair-rod dislocations were increased by more than 33% (or 11%) for the 2 at.% Re (or Co) systems. Due to the sessile nature of stair-rod dislocation, Re or Co will undeniably affect the mechanic properties of superalloy involving the dislocation mechanisms. For similar concentration of additions, Re is more effective in strengthening the single-crystal superalloys compared with the addition of Co.
分类号	二类
资助项目	Natural Science Foundation of China[11604237] ; Natural Science Foun-dation of Hebei Province of China[E2019105073] ; Natural Science Foun-dation of Hebei Province of China[E2015105079] ; Scientific Research Foundation of Tangshan Normal University of China[2016A06] ; Education and Teaching Reform Project of Tangshan Normal University of China[2019JG020]
WOS关键词	ALLOYING ELEMENTS ; CREEP ; MECHANISMS ; RU ; MICROSTRUCTURE ; DEFORMATION ; INTERFACE ; STRENGTH ; CRACKS
WOS研究方向	Materials Science
语种	英语
WOS记录号	WOS:000761179700003
资助机构	Natural Science Foundation of China ; Natural Science Foun-dation of Hebei Province of China ; Scientific Research Foundation of Tangshan Normal University of China ; Education and Teaching Reform Project of Tangshan Normal University of China
其他责任者	Yang, Hui-Jing
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/88733]
专题	力学研究所_非线性力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China 2.Tangshan Normal Univ, Sch Phys Sci & Technol, Tangshan 063000, Hebei, Peoples R China;
推荐引用方式 GB/T 7714	Liu, Shu-Lan,Yang, Hui-Jing. Assessing the critical role of Re and Co addition in flow stress of Ni-based single-crystal superalloy: A molecular dynamics study[J]. MATERIALS TODAY COMMUNICATIONS,2022,31:8.
APA	Liu, Shu-Lan,&Yang, Hui-Jing.(2022).Assessing the critical role of Re and Co addition in flow stress of Ni-based single-crystal superalloy: A molecular dynamics study.MATERIALS TODAY COMMUNICATIONS,31,8.
MLA	Liu, Shu-Lan,et al."Assessing the critical role of Re and Co addition in flow stress of Ni-based single-crystal superalloy: A molecular dynamics study".MATERIALS TODAY COMMUNICATIONS 31(2022):8.