| Structural softening mediated shear bands in high entropy alloys | |
Liu TW(刘天威) ; Pu Z(蒲卓); Yang ZY(杨增宇); Zhang, XuPing; Wang, GuiJi; Li T(李统); Cao FH(曹富华); Zhao, ShiTeng; Chen Y(陈艳); Wang, Jian; Dai LH(戴兰宏)
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| Source Publication | INTERNATIONAL JOURNAL OF PLASTICITY
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| 2024-12 | |
| Volume | 183Pages:104154 |
| ISSN | 0749-6419 |
| Abstract | Plastic flow localization is a fundamental and ubiquitous non-equilibrium phenomenon in metallic materials. Despite decades of extensive study, what derives its emergence remains elusive. Here, we tackle this problem in face-centered cubic (fcc) Cantor alloy by the newly developed ramp wave compression technique, which provides a unique quasi-isentropic loading path. By detailed microstructure characterizations, analytical estimation of temperature increment and large-scale atomistic simulations, we conclude that thermal softening is not a dominant driving force for shear band nucleation. Instead, nanotwinning triggers the initial transformation softening which is then accompanied with severe chemical fluctuations and the creation of lowangle dislocation boundaries (LADBs) associated with enhanced local dislocation slips in the adjacent regions. Such LADBs in turn lead to directional softening, acting as the catalytic mediating distortion between neighboring nanotwins. The interconnection between nanotwins and LADBs is thus regarded as structural origin of shear bands, whereas dynamic recrystallization only occurs later during shear band evolution, accelerating strain localization and thickening shear band. These findings shed new lights into fundamental understanding of shear banding and dynamic failure mechanisms in metallic materials. |
| Keyword | High-entropy alloys Shear band Ramp wave compression Twinning Low-angle dislocation boundary |
| DOI | 10.1016/j.ijplas.2024.104154 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:001351430900001 |
| WOS Research Area | Engineering ; Materials Science ; Mechanics |
| WOS Subject | Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics |
| Funding Organization | National Science Foundation of China (NSFC) {12432019, U2141204, 12102433, 11972346] ; Strategic Priority Research Program of the Chinese Academy of Sciences {XDB0620301] ; NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics {11988102] |
| Classification | 一类 |
| Ranking | 1 |
| Contributor | Dai LH ; Wang J |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/97205 |
| Collection | 非线性力学国家重点实验室 |
| Affiliation | 1.【Liu, Tian-Wei & Pu, Zhuo & Li, Tong & Cao, Fu-Hua & Chen, Yan & Dai, Lan-Hong】 Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China 2.【Liu, Tian-Wei & Pu, Zhuo & Li, Tong & Cao, Fu-Hua & Chen, Yan & Dai, Lan-Hong】 Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 3.【Yang, Zeng-Yu & Zhang, Xu-Ping & Wang, Gui-Ji】 China Acad Engn Phys, Inst Fluid Phys, Mianyang 621999, Sichuan, Peoples R China 4.【Zhao, Shi-Teng】 Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China 5.【Wang, Jian】 Univ Nebraska Lincoln, Mech & Mat Engn, Lincoln, NE 68588 USA |
| Recommended Citation GB/T 7714 | Liu TW,Pu Z,Yang ZY,et al. Structural softening mediated shear bands in high entropy alloys[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2024,183:104154.Rp_Au:Dai LH, Wang J |
| APA | 刘天威.,蒲卓.,杨增宇.,Zhang, XuPing.,Wang, GuiJi.,...&戴兰宏.(2024).Structural softening mediated shear bands in high entropy alloys.INTERNATIONAL JOURNAL OF PLASTICITY,183,104154. |
| MLA | 刘天威,et al."Structural softening mediated shear bands in high entropy alloys".INTERNATIONAL JOURNAL OF PLASTICITY 183(2024):104154. |
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