Molecular dynamics as a means to investigate grain size and strain rate effect on plastic deformation of 316 L nanocrystalline stainless-steel | |
Husain, Abdelrahim1,2; La, Peiqing2; Hongzheng, Yue2; Jie, Sheng2 | |
刊名 | Materials |
2020-07-01 | |
卷号 | 13期号:14 |
关键词 | Austenitic stainless steel Grain boundary sliding Grain size and shape Molecular dynamics Nanocrystals Plastic deformation Rotation Stacking faults Stresses Yield stress 316 L stainless steel Critical grain sizes Dislocation activity Molecular dynamics simulations Partial dislocations Plastic deformation mechanisms Strain rate effect Strain rate sensitivity |
DOI | 10.3390/ma13143223 |
英文摘要 | In the present study, molecular dynamics simulations were employed to investigate the effect of strain rate on the plastic deformation mechanism of nanocrystalline 316 L stainless-steel, wherein there was an average grain of 2.5-11.5 nm at room temperature. The results showed that the critical grain size was 7.7 nm. Below critical grain size, grain boundary activation was dominant (i.e., grain boundary sliding and grain rotation). Above critical grain size, dislocation activities were dominant. There was a slight effect that occurred during the plastic deformation mechanism transition from dislocation-based plasticity to grain boundaries, as a result of the stress rate on larger grain sizes. There was also a greater sensitive on the strain rate for smaller grain sizes than the larger grain sizes. We chose samples of 316 L nanocrystalline stainless-steel with mean grain sizes of 2.5, 4.1, and 9.9 nm. The values of strain rate sensitivity were 0.19, 0.22, and 0.14, respectively. These values indicated that small grain sizes in the plastic deformation mechanism, such as grain boundary sliding and grain boundary rotation, were sensitive to strain rates bigger than those of the larger grain sizes. We found that the stacking fault was formed by partial dislocation in all samples. These stacking faults were obstacles to partial dislocation emission in more sensitive stress rates. Additionally, the results showed that mechanical properties such as yield stress and flow stress increased by increasing the strain rate. © 2020 by the authors. |
语种 | 英语 |
出版者 | MDPI AG, Postfach, Basel, CH-4005, Switzerland |
WOS记录号 | WOS:000554308300001 |
内容类型 | 期刊论文 |
源URL | [http://ir.lut.edu.cn/handle/2XXMBERH/115367] |
专题 | 材料科学与工程学院 |
作者单位 | 1.Department of Physics, Faculty of Science and Technology, University of Shendi, P.O. Box 407, Shendi, Sudan 2.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China; |
推荐引用方式 GB/T 7714 | Husain, Abdelrahim,La, Peiqing,Hongzheng, Yue,et al. Molecular dynamics as a means to investigate grain size and strain rate effect on plastic deformation of 316 L nanocrystalline stainless-steel[J]. Materials,2020,13(14). |
APA | Husain, Abdelrahim,La, Peiqing,Hongzheng, Yue,&Jie, Sheng.(2020).Molecular dynamics as a means to investigate grain size and strain rate effect on plastic deformation of 316 L nanocrystalline stainless-steel.Materials,13(14). |
MLA | Husain, Abdelrahim,et al."Molecular dynamics as a means to investigate grain size and strain rate effect on plastic deformation of 316 L nanocrystalline stainless-steel".Materials 13.14(2020). |
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