Tuning chemical short-range order for simultaneous strength and toughness enhancement in NiCoCr medium-entropy alloys

doi:10.1016/j.ijplas.2024.103980

IMR OpenIR

	Tuning chemical short-range order for simultaneous strength and toughness enhancement in NiCoCr medium-entropy alloys
	Shuang, Siyao 1; Hu, Yanan 1; Li, Xiaotao 2; Yuan, Fuping 3; Kang, Guozheng 1; Gao, Huajian 4,5,6; Zhang, Xu 1,5
通讯作者	Gao, Huajian(gao.huajian@tsinghua.edu.cn) ; Zhang, Xu(xzhang@swjtu.edu.cn)
	2024-06-01
发表期刊	INTERNATIONAL JOURNAL OF PLASTICITY
ISSN	0749-6419
卷号	177 页码:17
摘要	The pursuit of enhancing strength and toughness remains a critical endeavor in the field of structural materials. This study explores two distinct strategies to overcome the traditional strength-toughness trade-off. Specifically, we manipulate the chemical composition and shortrange order (SRO) of the NiCoCr medium-entropy alloy, which has shown remarkable fracture toughness in recent experiments. Utilizing molecular dynamics simulations, we uncover nanoscale deformation mechanisms during crack propagation. Our findings highlight that optimizing the SRO degree leads to improvements in both atomic scale strength and toughness defined as the area underneath stress-strain curves from MD simulations. In contrast, a trade-off between strength and toughness persists when only manipulating the Ni content in the NiCoCr alloy. Based on the simulation results, we establish a strong correlation between toughness, strength, surface energies, and unstable stacking fault energies. These factors are influenced by the chemical composition and SROs in NiCoCr, with SROs acting as strong obstacles to dislocations, thereby contributing to additional strength. The exceptional toughness of NiCoCr with SRO arises from a synergy of intrinsic and extrinsic mechanisms, including dislocation glide, nanobridging during nanovoid coalescence and zigzag crack path. It is found that, in the presence of SRO, intrinsic toughening mechanisms usually associated with crack tip blunting and dissipation can also facilitate the onset of extrinsic toughening mechanisms of nanobridging and zig-zag crack path associated with nanovoid formation and coalescence. This study emphasizes the importance of tailoring SRO in designing materials with enhanced strength and toughness.
关键词	Toughness Short-range order Deformation mechanisms Medium -entropy alloy Molecular dynamics
资助者	National Natural Science Foundation of China
DOI	10.1016/j.ijplas.2024.103980
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[12222209] ; National Natural Science Foundation of China[12192214] ; National Natural Science Foundation of China[11872321]
WOS研究方向	Engineering ; Materials Science ; Mechanics
WOS类目	Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics
WOS记录号	WOS:001235841100001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：17[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/321006/186645
专题	中国科学院金属研究所
通讯作者	Gao, Huajian; Zhang, Xu
作者单位	1.Southwest Jiaotong Univ, Sch Mech & Aerosp, Appl Mech & Struct Safety Key Lab Sichuan Prov, Chengdu 610031, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing, Peoples R China 4.ASTAR, Inst High Performance Comp, Singapore 138632, Singapore 5.Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore 639798, Singapore 6.Tsinghua Univ, Mechano X Inst, Dept Engn Mech, Appl Mech Lab, Beijing 100084, Peoples R China
推荐引用方式 GB/T 7714	Shuang, Siyao,Hu, Yanan,Li, Xiaotao,et al. Tuning chemical short-range order for simultaneous strength and toughness enhancement in NiCoCr medium-entropy alloys[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2024,177:17.
APA	Shuang, Siyao.,Hu, Yanan.,Li, Xiaotao.,Yuan, Fuping.,Kang, Guozheng.,...&Zhang, Xu.(2024).Tuning chemical short-range order for simultaneous strength and toughness enhancement in NiCoCr medium-entropy alloys.INTERNATIONAL JOURNAL OF PLASTICITY,177,17.
MLA	Shuang, Siyao,et al."Tuning chemical short-range order for simultaneous strength and toughness enhancement in NiCoCr medium-entropy alloys".INTERNATIONAL JOURNAL OF PLASTICITY 177(2024):17.