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Title: Nanodomained Nickel Unite Nanocrystal Strength with Coarse- Grain Ductility
Author: Wu XL(武晓雷); Yuan FP(袁福平); Yang MX(杨沐鑫); Jiang P(姜萍); Zhang CX; Chen L; Wei YG(魏悦广); Ma E
Source: Scientific Reports
Issued Date: 2015
Volume: 5, Pages:11728
Abstract: Conventional metals are routinely hardened by grain refinement or by cold working with the expense of their ductility. Recent nanostructuring strategies have attempted to evade this strength versus ductility trade-off, but the paradox persists. It has never been possible to combine the strength reachable in nanocrystalline metals with the large uniform tensile elongation characteristic of coarse-grained metals. Here a defect engineering strategy on the nanoscale is architected to approach this ultimate combination. For Nickel, spread-out nanoscale domains (average 7 nm in diameter) were produced during electrodeposition, occupying only ~2.4% of the total volume. Yet the resulting Ni achieves a yield strength approaching 1.3 GPa, on par with the strength for nanocrystalline Ni with uniform grains. Simultaneously, the material exhibits a uniform elongation as large as ~30%, at the same level of ductile face-centered-cubic metals. Electron microscopy observations and molecular dynamics simulations demonstrate that the nanoscale domains effectively block dislocations, akin to the role of precipitates for Orowan hardening. In the meantime, the abundant domain boundaries provide dislocation sources and trapping sites of running dislocations for dislocation multiplication, and the ample space in the grain interior allows dislocation storage; a pronounced strain-hardening rate is therefore sustained to enable large uniform elongation.
Language: 英语
Indexed Type: SCI
DOI: 10.1038/srep11728
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/311007/58742
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,Yuan FP,Yang MX,et al. Nanodomained Nickel Unite Nanocrystal Strength with Coarse- Grain Ductility[J]. Scientific Reports,2015,5:11728.
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