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Heterogeneous lamella structure unites ultrafine-grain strength with coarse-grain ductility
Wu XL(武晓雷); Yang MX; Yuan FP(袁福平); Wu GL; Wei YJ(魏宇杰); Huang XX; Zhu YT; Wu, XL (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
Source PublicationPROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
2015-11-24
Volume112Issue:47Pages:14501-14505
ISSN0027-8424
AbstractGrain 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.
KeywordBack-stress Hardening Heterogeneous Lamella Structure Ductility Strength Strain Partitioning
DOI10.1073/pnas.1517193112
URL查看原文
Indexed BySCI
Language英语
WOS IDWOS:000365173100046
WOS KeywordSEVERE PLASTIC-DEFORMATION ; PASSIVATED COPPER NANOPILLARS ; RANGE INTERNAL-STRESSES ; NANOSTRUCTURED METALS ; BAUSCHINGER ; STRAIN ; DISLOCATION ; CRYSTALS ; STEEL ; FILMS
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
Funding OrganizationThe 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.
DepartmentLNM材料介观力学性能的表征
Classification一类
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Cited Times:246[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/58382
Collection非线性力学国家重点实验室
Corresponding AuthorWu, XL (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
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,2015,112(47):14501-14505.
APA Wu XL.,Yang MX.,Yuan FP.,Wu GL.,Wei YJ.,...&Wu, XL .(2015).Heterogeneous lamella structure unites ultrafine-grain strength with coarse-grain ductility.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,112(47),14501-14505.
MLA Wu XL,et al."Heterogeneous lamella structure unites ultrafine-grain strength with coarse-grain ductility".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 112.47(2015):14501-14505.
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