Mechanical behavior of gradient nanotwinned Cu: A dislocation-based constitutive model incorporating gradient effects

doi:10.1016/j.msea.2025.147805

IMR OpenIR

	Mechanical behavior of gradient nanotwinned Cu: A dislocation-based constitutive model incorporating gradient effects
	Kim, Yongju 1; Cheng, Zhao 2; Gu, Gang Hee 1; Lu, Lei 2; Kim, Hyoung Seop 1,3,4,5,6
通讯作者	Kim, Hyoung Seop(hskim@postech.ac.kr)
	2025-03-01
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	925 页码:13
摘要	In recent years, gradient microstructures have drawn great attention due to their ability to enhance strength and ductility by manipulating microstructural features, regardless of the alloy type. This study investigates the )deformation mechanisms according to the different volume fractions of gradient regions (fg in nanotwinned (GNT) Cu specimens from abrupt to gradual transitions (fg approximate to 10 % and 100 %). This gradient region spans several transitional layers between established soft and hard components: the former consists of nanotwins within larger grains and the latter of nanotwins within smaller grains. The quantitative analysis of the additional strengthening effects attributed to varying fg has been conducted by implementing a developed dislocation-based constitutive model based on the previous experimental findings [Cheng et al. Acta 242 (2023) 118,456]. The gradient effect resulted in additional nucleation of geometrically necessary dislocations (GNDs), which depended on a level of strain incompatibility at each interface of the transition layers. This finding provides a fundamental understanding of the hetero-deformation-induced (HDI) stress arising from microstructural heterogeneity in gradient structure.
关键词	Gradient nanotwinned structure Dislocation-based constitutive model Geometrically necessary dislocations Finite element method
资助者	National Research Foundation of Korea (NRF) - Korean government (MSIP) ; International partnership program of the Chinese Academy of Sciences
DOI	10.1016/j.msea.2025.147805
收录类别	SCI
语种	英语
资助项目	National Research Foundation of Korea (NRF) - Korean government (MSIP)[NRF-2021R1A2C3006662] ; International partnership program of the Chinese Academy of Sciences[172GJHZ2023075GC]
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001409822400001
出版者	ELSEVIER SCIENCE SA
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/180684
专题	中国科学院金属研究所
通讯作者	Kim, Hyoung Seop
作者单位	1.Pohang Univ Sci & Technol POSTECH, Dept Mat Sci & Engn, Pohang 37673, South Korea 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 3.Pohang Univ Sci & Technol POSTECH, Grad Inst Ferrous & Eco Mat Technol, Pohang 37673, South Korea 4.Yonsei Univ, Inst Convergence Res & Educ Adv Technol, Seoul 03722, South Korea 5.Pohang Univ Sci & Technol POSTECH, Ctr Heterogenic Met Addit Mfg, Pohang 37673, South Korea 6.Tohoku Univ, Adv Inst Mat Res WPI AIMR, Sendai 9808577, Japan
推荐引用方式 GB/T 7714	Kim, Yongju,Cheng, Zhao,Gu, Gang Hee,et al. Mechanical behavior of gradient nanotwinned Cu: A dislocation-based constitutive model incorporating gradient effects[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2025,925:13.
APA	Kim, Yongju,Cheng, Zhao,Gu, Gang Hee,Lu, Lei,&Kim, Hyoung Seop.(2025).Mechanical behavior of gradient nanotwinned Cu: A dislocation-based constitutive model incorporating gradient effects.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,925,13.
MLA	Kim, Yongju,et al."Mechanical behavior of gradient nanotwinned Cu: A dislocation-based constitutive model incorporating gradient effects".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 925(2025):13.