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Title:
Size effect and boundary type on the strengthening of nanoscale domains in pure nickel
Author: Yuan FP(袁福平); Wu XL(武晓雷)
Source: Materials Science and Engineering A
Issued Date: 2015-11-11
Volume: 648, Pages:243-251
Abstract: A series of large-scale molecular dynamics simulations were carried out to investigate the interactions between an extended edge dislocation (1/2 < 112 > (111)) and nanoscale domains in pure nickel. The pinning strength of nano-domains and the corresponding atomistic interaction mechanisms were found to be closely related to the domain boundary type, the domain size and spacing. The pinning strengths were found to be higher for high-angle domains than those for low-angle domains at the same size scale, and increase with increasing domain size and decreasing domain spacing. Unlike the by-pass via interactions between the dislocation and boundaries for high-angle domains (much like the role of hard precipitates in alloys), the dislocation was found to cut partly through the low-angle domains. Thus the dragging force from the boundary segments of the low-angle domains should be smaller when compared to the Orowan's strengthening for "hard particles", such as high-angle domains. The predictions from Ashby's model on Orowan's strengthening are higher than the simulation data for low-angle domains, while agree relatively well with those for high-angle domains. Moreover, a more universal model was proposed to connect the dislocation line shape at the critical shear strain with the pinning strength. (C) 2015 Elsevier B.V. All rights reserved.
Keyword: Dislocation ; Orowan's strengthening ; Molecular dynamics ; Pinning strength ; Nano-domains
Language: 英语
Indexed Type: SCI ; EI
Corresponding Author: Yuan, FP (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15 North 4th Ring,West Rd, Beijing 100190, Peoples R China.
DOI: 10.1016/j.msea.2015.09.071
Related URLs: 查看原文
DOC Type: 期刊论文
WOS Subject: Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS Subject Extended: Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS Keyword Plus: SEVERE PLASTIC-DEFORMATION ; NANOSTRUCTURED METALS ; PRECIPITATE SHAPE ; TENSILE DUCTILITY ; MAXIMUM STRENGTH ; ALPHA-IRON ; ALLOYS ; COPPER ; MECHANISMS ; NI
WOS ID: WOS:000363820700032
ISSN: 0921-5093
Funder: The authors would like to acknowledge the financial support from National Natural Science Foundation of China (Nos. 11222224, 11472286 and 11021262) and National Key Basic Research Program of China (Grants nos. 2012CB932203 and 2012CB937500). The simulations reported were performed at Supercomputing Center of Chinese Academy of Sciences.
Rank: [Yuan, Fuping; Wu, Xiaolei] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
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/311007/58336
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:
Yuan FP,Wu XL. Size effect and boundary type on the strengthening of nanoscale domains in pure nickel[J]. Materials Science and Engineering A,2015-11-11,648:243-251.
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