Dissecting the Mechanism of Martensitic Transformation via Atomic-Scale Observations | |
Yang, Xu-Sheng1; Sun, Sheng1; Wu XL(武晓雷)2; Ma, Evan3; Zhang, Tong-Yi1; Zhang, TY (reprint author), Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Kowloon, Hong Kong, Peoples R China. | |
发表期刊 | SCIENTIFIC REPORTS |
2014-08-21 | |
卷号 | 4页码:6141 |
ISSN | 2045-2322 |
摘要 | Martensitic transformation plays a pivotal role in the microstructural evolution and plasticity of many engineering materials. However, so far the underlying atomic processes that accomplish the displacive transformation have been obscured by the difficulty in directly observing key microstructural signatures on atomic scale. To resolve this long-standing problem, here we examine an AISI 304 austenitic stainless steel that has a strain/microstructure-gradient induced by surface mechanical attrition, which allowed us to capture in one sample all the key interphase regions generated during the gamma(fcc) -> epsilon(hcp) -> alpha'(bcc) transition, a prototypical case of deformation induced martensitic transformation (DIMT). High-resolution transmission electron microscopy (HRTEM) observations confirm the crucial role of partial dislocations, and reveal tell-tale features including the lattice rotation of the alpha' martensite inclusion, the transition lattices at the epsilon/alpha' interfaces that cater the shears, and the excess reverse shear-shuffling induced gamma necks in the e martensite plates. These direct observations verify for the first time the 50-year-old Bogers-Burgers-Olson-Cohen (BBOC) model, and enrich our understanding of DIMT mechanisms. Our findings have implications for improved microstructural control in metals and alloys. |
学科领域 | Science & Technology - Other Topics |
DOI | 10.1038/srep06141 |
URL | 查看原文 |
收录类别 | SCI |
语种 | 英语 |
WOS记录号 | WOS:000340714500002 |
关键词[WOS] | STAINLESS-STEEL ; MOLECULAR-DYNAMICS ; PHASE-TRANSITIONS ; NUCLEATION ; ALLOYS |
WOS研究方向 | Science & Technology - Other Topics |
WOS类目 | Multidisciplinary Sciences |
项目资助者 | The authors are grateful to Professor Jian Lu for his help in this work. This work was supported by the General Research Fund (Project number, 622911) from the Hong Kong Research Grants Council. T.Y.Z. is grateful for the financial support from the Fang Professorship and the Distinguished Research Excellence Award from the Engineering School of HKUST. ; General Research Fund from the Hong Kong Research Grants Council(622911) ; Fang Professorship ; Distinguished Research Excellence Award from the Engineering School of HKUST |
课题组名称 | LNM材料介观力学性能的表征 |
论文分区 | 一类 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://dspace.imech.ac.cn/handle/311007/49059 |
专题 | 非线性力学国家重点实验室 |
通讯作者 | Zhang, TY (reprint author), Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Kowloon, Hong Kong, Peoples R China. |
作者单位 | 1.Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Kowloon, Hong Kong, Peoples R China 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100080, Peoples R China 3.Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA |
推荐引用方式 GB/T 7714 | Yang, Xu-Sheng,Sun, Sheng,Wu XL,et al. Dissecting the Mechanism of Martensitic Transformation via Atomic-Scale Observations[J]. SCIENTIFIC REPORTS,2014,4:6141. |
APA | Yang, Xu-Sheng,Sun, Sheng,Wu XL,Ma, Evan,Zhang, Tong-Yi,&Zhang, TY .(2014).Dissecting the Mechanism of Martensitic Transformation via Atomic-Scale Observations.SCIENTIFIC REPORTS,4,6141. |
MLA | Yang, Xu-Sheng,et al."Dissecting the Mechanism of Martensitic Transformation via Atomic-Scale Observations".SCIENTIFIC REPORTS 4(2014):6141. |
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