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Nanoscale precipitates as sustainable dislocation sources for enhanced ductility and high strength

文献类型：期刊论文

作者Peng SY(彭神佑)3,4; Wei YJ(魏宇杰)3,4; Gao HJ(高华健)1,2
刊名PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
出版日期2020-03-10
卷号117期号:10页码:5204-5209
ISSN号0027-8424
关键词nanoscale precipitate dislocation sources ductility strength multiple-element alloy
DOI10.1073/pnas.1914615117
通讯作者Wei, Yujie(yujie_wei@lnm.imech.ac.cn) ; Gao, Huajian(huajian.gao@ntu.edu.sg)
英文摘要Traditionally, precipitates in a material are thought to serve as obstacles to dislocation glide and cause hardening of the material. This conventional wisdom, however, fails to explain recent discoveries of ultrahigh-strength and large-ductility materials with a high density of nanoscale precipitates, as obstacles to dislocation glide often lead to high stress concentration and even microcracks, a cause of progressive strain localization and the origin of the strength-ductility conflict. Here we reveal that nanoprecipitates provide a unique type of sustainable dislocation sources at sufficiently high stress, and that a dense dispersion of nanoprecipitates simultaneously serve as dislocation sources and obstacles, leading to a sustainable and self-hardening deformation mechanism for enhanced ductility and high strength. The condition to achieve sustainable dislocation nucleation from a nanoprecipitate is governed by the lattice mismatch between the precipitate and matrix, with stress comparable to the recently reported high strength in metals with large amount of nanoscale precipitates. It is also shown that the combination of Orowan's precipitate hardening model and our critical condition for dislocation nucleation at a nanoprecipitate immediately provides a criterion to select precipitate size and spacing in material design. The findings reported here thus may help establish a foundation for strength-ductility optimization through densely dispersed nanoprecipitates in multiple-element alloy systems.
分类号一类
WOS关键词HIGH-ENTROPY ALLOY ; DEFORMATION ; NUCLEATION ; PHASE ; STEEL ; GENERATION ; ENERGY ; SIZE ; AL
资助项目National Natural Science Foundation of China (NSFC) Basic Science Center for Multiscale Problems in Nonlinear Mechanics[11988102] ; NSFC[11425211] ; NSFC[11790291] ; Strategic Priority Research Program of the Chinese Academy of Sciences (CAS)[XDB22020200] ; CAS Center for Excellence in Complex System Mechanics ; National Science Foundation[DMR-1709318]
WOS研究方向Science & Technology - Other Topics
语种英语
WOS记录号WOS:000519530400023
资助机构National Natural Science Foundation of China (NSFC) Basic Science Center for Multiscale Problems in Nonlinear Mechanics ; NSFC ; Strategic Priority Research Program of the Chinese Academy of Sciences (CAS) ; CAS Center for Excellence in Complex System Mechanics ; National Science Foundation
其他责任者Wei, Yujie ; Gao, Huajian
源URL[http://dspace.imech.ac.cn/handle/311007/81798]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.ASTAR, Inst High Performance Comp, Singapore 138632, Singapore
2.Nanyang Technol Univ, Coll Engn, Sch Mech & Aerosp Engn, Singapore 639798, Singapore;
3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China;
4.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China;
推荐引用方式
GB/T 7714		 Peng SY,Wei YJ,Gao HJ. Nanoscale precipitates as sustainable dislocation sources for enhanced ductility and high strength[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2020,117(10):5204-5209.
APA 彭神佑,魏宇杰,&高华健.(2020).Nanoscale precipitates as sustainable dislocation sources for enhanced ductility and high strength.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,117(10),5204-5209.
MLA 彭神佑,et al."Nanoscale precipitates as sustainable dislocation sources for enhanced ductility and high strength".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 117.10(2020):5204-5209.

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来源：力学研究所

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