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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.
Source PublicationSCIENTIFIC REPORTS
2014-08-21
Volume4Pages:6141
ISSN2045-2322
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.

Subject AreaScience & Technology - Other Topics
DOI10.1038/srep06141
URL查看原文
Indexed BySCI
Language英语
WOS IDWOS:000340714500002
WOS KeywordSTAINLESS-STEEL ; MOLECULAR-DYNAMICS ; PHASE-TRANSITIONS ; NUCLEATION ; ALLOYS
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
Funding OrganizationThe 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
DepartmentLNM材料介观力学性能的表征
Classification一类
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/49060
Collection非线性力学国家重点实验室
Corresponding AuthorZhang, TY (reprint author), Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Kowloon, Hong Kong, Peoples R China.
Affiliation1.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
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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