Experimental decoding of grain boundary-based plastic deformation

被引:12
|
作者
Wu, Yupeng [1 ]
Zhang, Yujie [1 ]
Shui, Langquan [1 ]
Wu, Jinsong [2 ]
Liu, Ze [1 ,3 ,4 ]
机构
[1] Wuhan Univ, Sch Civil Engn, Dept Engn Mech, Wuhan 430072, Hubei, Peoples R China
[2] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China
[3] Wuhan Univ, State Key Lab Water Resources & Hydropower Engn Sc, Wuhan 430072, Hubei, Peoples R China
[4] Wuhan Univ, Inst Technol Sci, Wuhan 430072, Hubei, Peoples R China
关键词
Grain boundary (GB); Plastic deformation; GB-affected zone; Deformation mechanism map; Molecular dynamics simulation; MECHANISM MAP; DIFFUSION; CREEP; TEMPERATURE; SEGREGATION; METALS; SILVER;
D O I
10.1016/j.actamat.2021.117534
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Here, we apply the electron backscatter diffraction (EBSD) technique to identify grain boundaries (GBs) in a metal sheet surface, and the metal sheet is subsequently deformed via contact with a hard nanomold. Quantified by the length of molded nanorods, combining with molecular dynamics (MD) simulations and transmission electron microscopy (TEM) characterization, the microstructure evolution and the important influence of individual GBs on plastic deformation during nanomolding of crystalline Ag at different temperatures and stresses are revealed. Diffusion-based mechanisms become dominant once the temperature is above a critical value (T-tran similar to 0. 54T(m)), and the GB-affected zone in this temperature range is measured as several micrometers, approximately 3-4 orders of magnitude larger than the structural width of GBs. Finally, benefiting from the decoded GB-based deformation mechanism, we demonstrate that the prevalent deformation mechanism map can be experimentally constructed with high efficiency based on the proposed method. Our findings provide new insights into the individual GB-based deformation mechanism at high temperature and show the importance of developing new methods for constructing deformation mechanism maps to experimentally quantify specific deformation mechanisms. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页数:10
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