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Title:
Heterogeneous lamella structure unites ultrafine-grain strength with coarse-grain ductility
Author: Wu XL(武晓雷); Yang MX; Yuan FP(袁福平); Wu GL; Wei YJ(魏宇杰); Huang XX; Zhu YT
Source: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Issued Date: 2015-11-24
Volume: 112, Issue:47, Pages:14501-14505
Abstract: Grain refinement can make conventional metals several times stronger, but this comes at dramatic loss of ductility. Here we report a heterogeneous lamella structure in Ti produced by asymmetric rolling and partial recrystallization that can produce an unprecedented property combination: as strong as ultrafine-grained metal and at the same time as ductile as conventional coarse-grained metal. It also has higher strain hardening than coarse-grained Ti, which was hitherto believed impossible. The heterogeneous lamella structure is characterized with soft micrograined lamellae embedded in hard ultrafine-grained lamella matrix. The unusual high strength is obtained with the assistance of high back stress developed from heterogeneous yielding, whereas the high ductility is attributed to back-stress hardening and dislocation hardening. The process discovered here is amenable to large-scale industrial production at low cost, and might be applicable to other metal systems.
Keyword: back-stress hardening ; heterogeneous lamella structure ; ductility ; strength ; strain partitioning
Language: 英语
Indexed Type: SCI
Corresponding Author: Wu, XL (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
Correspondent Email: xlwu@imech.ac.cn ; ytzhu@ncsu.edu
DOI: 10.1073/pnas.1517193112
Related URLs: 查看原文
DOC Type: 期刊论文
WOS Subject: Multidisciplinary Sciences
WOS Subject Extended: Science & Technology - Other Topics
WOS Keyword Plus: SEVERE PLASTIC-DEFORMATION ; PASSIVATED COPPER NANOPILLARS ; RANGE INTERNAL-STRESSES ; NANOSTRUCTURED METALS ; BAUSCHINGER ; STRAIN ; DISLOCATION ; CRYSTALS ; STEEL ; FILMS
WOS ID: WOS:000365173100046
ISSN: 0027-8424
Funder: The authors thank Prof. W. D. Nix for his insightful and constructive comments on this paper. X. W., M. Y., F. Y., and Y. W. are funded by the National Natural Science Foundation of China (11572328, 11072243, 11222224, 11472286, and 51471039) and Ministry of Science and Technology (2012CB932203, 2012CB937500, and 6138504). Y. Z. is funded by the US Army Research Office (W911 NF-12-1-0009), the US National Science Foundation (DMT-1104667), and the Nanjing University of Science and Technology.
Rank: [Wu, Xiaolei; Yang, Muxin; Yuan, Fuping; Wei, Yujie] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; [Wu, Guilin; Huang, Xiaoxu] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China; [Zhu, Yuntian] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nanjing 210094, Jiangsu, Peoples R China; [Zhu, Yuntian] N Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA
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/311007/58382
Appears in Collections:非线性力学国家重点实验室_期刊论文

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Recommended Citation:
Wu XL,Yang MX,Yuan FP,et al. Heterogeneous lamella structure unites ultrafine-grain strength with coarse-grain ductility[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2015-11-24,112(47):14501-14505.
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