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Title:
Dissecting the Mechanism of Martensitic Transformation via Atomic-Scale Observations
Author: Yang, Xu-Sheng1; Sun, Sheng1; Wu XL(武晓雷)2; Ma, Evan3; Zhang, Tong-Yi1
Source: SCIENTIFIC REPORTS
Issued Date: 2014-08-21
Volume: 4, Pages:6141
Abstract:

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.

Language: 英语
Indexed Type: SCI
Corresponding Author: Zhang, TY (reprint author), Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Kowloon, Hong Kong, Peoples R China.
Correspondent Email: mezhangt@ust.hk
DOI: 10.1038/srep06141
Related URLs: 查看原文
DOC Type: Article
WOS Subject: Multidisciplinary Sciences
WOS Subject Extended: Science & Technology - Other Topics
WOS Keyword Plus: STAINLESS-STEEL ; MOLECULAR-DYNAMICS ; PHASE-TRANSITIONS ; NUCLEATION ; ALLOYS
WOS ID: WOS:000340714500002
ISSN: 2045-2322
Funder: General Research Fund from the Hong Kong Research Grants Council(622911) ; Fang Professorship ; Distinguished Research Excellence Award from the Engineering School of HKUST
Rank: [Yang, Xu-Sheng; Sun, Sheng; Zhang, Tong-Yi] Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Kowloon, Hong Kong, Peoples R China; [Wu, Xiao-Lei] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100080, Peoples R China; [Ma, Evan] Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA
Subject: Science & Technology - Other Topics
Department: LNM材料介观力学性能的表征
Classification: 一类
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/49060
Appears in Collections:非线性力学国家重点实验室_期刊论文

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description.institution: 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

Recommended Citation:
Yang, Xu-Sheng,Sun, Sheng,Wu XL,et al. Dissecting the Mechanism of Martensitic Transformation via Atomic-Scale Observations[J]. SCIENTIFIC REPORTS,2014-08-21,4:6141.
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