| Tuning chemical short-range order for simultaneous strength and toughness enhancement in NiCoCr medium-entropy alloys | |
Shuang, Siyao1; Hu, Yanan1; Li, Xiaotao2; Yuan FP(袁福平)3 ; Kang, Guozheng1; Gao, Huajian4,5,6; Zhang, Xu1,5
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| Corresponding Author | Gao, Huajian([email protected]) ; Zhang, Xu([email protected]) |
| Source Publication | INTERNATIONAL JOURNAL OF PLASTICITY
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| 2024-06-01 | |
| Volume | 177Pages:17 |
| ISSN | 0749-6419 |
| Abstract | 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. |
| Keyword | Toughness Short-range order Deformation mechanisms Medium -entropy alloy Molecular dynamics |
| DOI | 10.1016/j.ijplas.2024.103980 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:001235841100001 |
| WOS Keyword | LATTICE DISTORTION ; BEHAVIOR |
| WOS Research Area | Engineering ; Materials Science ; Mechanics |
| WOS Subject | Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics |
| Funding Project | National Natural Science Foundation of China[12222209] ; National Natural Science Foundation of China[12192214] ; National Natural Science Foundation of China[11872321] |
| Funding Organization | National Natural Science Foundation of China |
| Classification | 一类 |
| Ranking | 3+ |
| Contributor | Gao, Huajian ; Zhang, Xu |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/95481 |
| Collection | 非线性力学国家重点实验室 |
| Affiliation | 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 |
| Recommended Citation 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.Rp_Au:Gao, Huajian, Zhang, Xu |
| APA | Shuang, Siyao.,Hu, Yanan.,Li, Xiaotao.,袁福平.,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. |
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