New insights into omega-embrittlement in high misfit metastable beta-titanium alloys: Mechanically-driven omega-mediated amorphization
文献类型：期刊论文
| 作者 | Chen, Wei1; Cao, Shuo2; Zhang, Jinyu1; Zha, You1; Hu, Qingmiao2; Sun, Jun1 |
| 刊名 | MATERIALS & DESIGN
 |
| 出版日期 | 2021-07-01 |
| 卷号 | 205页码:18 |
| 关键词 | Titanium alloys omega-precipitates Brittleness Slip band Amorphization |
| ISSN号 | 0264-1275 |
| DOI | 10.1016/j.matdes.2021.109724 |
| 通讯作者 | Zhang, Jinyu(jinyuzhang1002@mail.xjtu.edu.cn) ; Hu, Qingmiao(qmhu@imr.ac.cn) |
| 英文摘要 | omega-embrittlement is ubiquitous in metastable beta-titanium (Ti) alloys, while the fundamental understanding on the damage-fracture mechanism hitherto remains elusive. In this study, we systematically investigate omega-embrittlement of high misfit Ti-10Cr (wt.%) alloys by coupling experiments and first-principles calculation. It is found that brittle cleavage-like fracture prevails in tensile samples, irrespective of the quenching or subsequent aging states. Microscopically, cracks nucleation and propagation proceed along slip bands, inside which omega-lattices are first disordered and then the localized (beta + omega)-amorphous-like structures are developed in the shape of white patches. The underlying mechanism of mechanically-driven localized amorphization is that due to the remarkable covalent character of atomic bonding of x-precipitates caused by composition partitioning of the Cr element, omega-precipitates impart extremely high energy barrier opposed to dislocation gliding and render dislocations pile-up ahead of omega-precipitates, thus leading to their lattice disordering. It is unveiled that the hydrostatic pressure, serving as the driving force for dislocations pile-up, plays a critical role in this unusual cleavage-like fracture of Ti-10Cr alloys caused by mechanically-driven omega-mediated localized amorphization. Accompanied by the transition from the co-operation of deformation twining and ordinary dislocation slip in the quenched Ti10Cr alloys to the exclusive ordinary dislocation slip in the long-time aged Ti-10Cr samples, it is unexpected that the resulting tensile fracture strength monotonically decreases to a stress level of similar to 100 MPa. These findings provide new insights into the damage and fracture behavior of high misfit beta-titanium alloys, such as Ti-Cr alloys. (C) 2021 The Authors. Published by Elsevier Ltd. |
| 资助项目 | National Natural Science Foundation of China[51871176] ; National Natural Science Foundation of China[51722104] ; National Natural Science Foundation of China[51621063] ; National Natural Science Foundation of China[91860107] ; National Natural Science Foundation of China[52071315] ; National Natural Science Foundation of China[52001307] ; National Key Research and Development Program of China[2017YFA0700701] ; 111 Project 2.0 of China[PB2018008] ; Natural Science Basic Research Plan in Shaanxi Province of China[2018JM5098] ; International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technologies ; Fok Ying-Tong Education Foundation[161096] ; Fundamental Research Funds for the Central Universities[xtr022019004] |
| WOS研究方向 | Materials Science |
| 语种 | 英语 |
| WOS记录号 | WOS:000663558100006 |
| 出版者 | ELSEVIER SCI LTD |
| 资助机构 | National Natural Science Foundation of China ; National Key Research and Development Program of China ; 111 Project 2.0 of China ; Natural Science Basic Research Plan in Shaanxi Province of China ; International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technologies ; Fok Ying-Tong Education Foundation ; Fundamental Research Funds for the Central Universities |
| 源URL | [http://ir.imr.ac.cn/handle/321006/160601]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Zhang, Jinyu; Hu, Qingmiao |
| 作者单位 | 1.Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Wei,Cao, Shuo,Zhang, Jinyu,et al. New insights into omega-embrittlement in high misfit metastable beta-titanium alloys: Mechanically-driven omega-mediated amorphization[J]. MATERIALS & DESIGN,2021,205:18. |
| APA | Chen, Wei,Cao, Shuo,Zhang, Jinyu,Zha, You,Hu, Qingmiao,&Sun, Jun.(2021).New insights into omega-embrittlement in high misfit metastable beta-titanium alloys: Mechanically-driven omega-mediated amorphization.MATERIALS & DESIGN,205,18. |
| MLA | Chen, Wei,et al."New insights into omega-embrittlement in high misfit metastable beta-titanium alloys: Mechanically-driven omega-mediated amorphization".MATERIALS & DESIGN 205(2021):18. |
入库方式： OAI收割
来源：金属研究所
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