Heterogeneous lamella structure unites ultrafine-grain strength with coarse-grain ductility

doi:10.1073/pnas.1517193112

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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.
发表期刊	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
	2015-11-24
卷号	112 期号:47 页码:14501-14505
ISSN	0027-8424
摘要	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.
关键词	Back-stress Hardening Heterogeneous Lamella Structure Ductility Strength Strain Partitioning
DOI	10.1073/pnas.1517193112
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收录类别	SCI
语种	英语
WOS记录号	WOS:000365173100046
关键词[WOS]	SEVERE PLASTIC-DEFORMATION ; PASSIVATED COPPER NANOPILLARS ; RANGE INTERNAL-STRESSES ; NANOSTRUCTURED METALS ; BAUSCHINGER ; STRAIN ; DISLOCATION ; CRYSTALS ; STEEL ; FILMS
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
项目资助者	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.
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	被引频次：1138[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/58382
专题	非线性力学国家重点实验室
通讯作者	Wu, XL (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
推荐引用方式 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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