Molecular dynamics simulation study of the effect of temperature and grain size on the deformation behavior of polycrystalline cementite

被引：25
|
作者：
Ghaffarian, Hadi [1 ,2 ]
Taheri, Ali Karimi [2 ]
Kang, Keonwook [3 ]
Ryu, Sennghwa [1 ]
机构：
[1] Korea Adv Inst Sci & Technol, Dept Mech Engn, Taejon 305701, South Korea
[2] Sharif Univ Technol, Dept Mat Sci & Engn, Tehran, Iran
[3] Yonsei Univ, Dept Mech Engn, Seoul 120749, South Korea
来源：
SCRIPTA MATERIALIA | 2015年 / 95卷
基金：
新加坡国家研究基金会; 美国国家科学基金会;
关键词：
Polycrystalline cementite; Molecular dynamics simulation; Brittle-to-ductile transition; Grain boundary sliding; CARBON DIFFUSION; BULK CEMENTITE; METALLIC GLASSES; DISLOCATIONS; FABRICATION; STRENGTH; FRACTURE; ALLOY;
D O I：
10.1016/j.scriptamat.2014.09.022
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Molecular dynamics simulations combined with quantitative atomic displacement analyses were performed to study the deformation behaviors of polycrystalline cementite (Fe3C). At low temperature and large grain size, dislocation glide acts as the preferred deformation mechanism. Due to the limited number of slip systems at low temperature, polycrystalline cementite breaks by forming voids at grain boundaries upon tensile loading. When the temperature rises or the grain size reduces, grain boundary sliding becomes the primary mechanism and plastic deformation is accommodated effectively. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：23 / 26
页数：4
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