Size-dependent plastic deformation and failure mechanisms of nanotwinned Ni3Al: Insights from an atomistic cracking model
文献类型：期刊论文
| 作者 | Wang YJ; Tsuchiya K; Dai LH(戴兰宏) |
| 刊名 | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
 |
| 出版日期 | 2016-01 |
| 卷号 | 649页码:449-460 |
| 通讯作者邮箱 | yjwang@imech.ac.cn ; lhdai@lnm.imech.ac.cn |
| 关键词 | Nanostructured materials Twinning Crystal plasticity Fracture Atomistic simulations |
| ISSN号 | 0921-5093 |
| 产权排序 | [Wang, Yun-Jiang; Dai, L. H.] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; [Tsuchiya, Koichi] Natl Inst Mat Sci, Res Ctr Strateg Mat, Tsukuba, Ibaraki 3050047, Japan |
| 通讯作者 | Wang, YJ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China. |
| 中文摘要 | The polycrystalline Ni3Al is brittle since the notorious intergranular fracture mode hinders its applications. Here we perform molecular dynamics to highlight the unique role of nanotwin boundary in the plastic deformation and failure mechanisms of Ni3Al via an atomistic cracking model. Surprisingly, the strength, ductility and fracture toughness of the nanotwinned Ni3Al are revealed to increase simultaneously with reducing twin size, possibly evading a traditional tradeoff between ductility/toughness and strength. A possible quasi-brittle fracture mode in single crystalline Ni3Al is recognized as nucleating twinning partials from crack tip. However, the pre-existing twin boundaries can suppress the emission and propagation of successive twinning dislocations. Instead, dislocation avalanches happen and serve as a crack blunting mechanism which leads to the ductile fracture pattern of the nanotwinned Ni3Al. A sizedependent transition of fracture mode from dislocation nucleation to shear localization is observed as twin becomes very small. A physical model combined with energetics analysis is provided to rationalize the transition. Our atomistic insights are in qualitative agreement with recent observations of improved strength and ductility of Ni3Al with disordered nanotwinned structure after severe plastic deformation. (C) 2015 Elsevier B.V. All rights reserved. |
| 分类号 | 一类 |
| 类目[WOS] | Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| 研究领域[WOS] | Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering |
| 关键词[WOS] | MOLECULAR-DYNAMICS METHOD ; HIGH-PRESSURE TORSION ; NANOCRYSTALLINE MATERIALS ; FRACTURE-TOUGHNESS ; ULTRAHIGH STRENGTH ; MAXIMUM STRENGTH ; SHAPE-MEMORY ; METALS ; DUCTILITY ; HARDNESS |
| 收录类别 | SCI ; EI |
| 原文出处 | http://dx.doi.org/10.1016/j.msea.2015.10.006 |
| 语种 | 英语 |
| WOS记录号 | WOS:000364796400051 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/58381]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Wang YJ,Tsuchiya K,Dai LH. Size-dependent plastic deformation and failure mechanisms of nanotwinned Ni3Al: Insights from an atomistic cracking model[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2016,649:449-460. |
| APA | Wang YJ,Tsuchiya K,&Dai LH.(2016).Size-dependent plastic deformation and failure mechanisms of nanotwinned Ni3Al: Insights from an atomistic cracking model.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,649,449-460. |
| MLA | Wang YJ,et al."Size-dependent plastic deformation and failure mechanisms of nanotwinned Ni3Al: Insights from an atomistic cracking model".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 649(2016):449-460. |
入库方式： OAI收割
来源：力学研究所
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