Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 675, Issue -, Pages 128-133Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.03.069
Keywords
VN; Molecular dynamics simulation; Deformation twin; Indentation
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Funding
- National Natural Science Foundation of China [11332013, 11272364]
- JSPS
- CAS
- Shorai Foundation for Science and Technology
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2015jcyjA50008]
- [15H04114]
- [15104117]
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We perform molecular dynamics simulation of nano-indentation with a cylindrical indenter to investigate the formation mechanism of deformation twin in vanadium nitride (VN) with a rocksalt structure. We find that the deformation twins occur during the loading stage, and subsequently conduct a systematic analysis of nucleation, propagation and thickening of a deformation twin. We find that the nucleation of a partial dislocation and its propagation to form a stacking fault are premise of deformation twin formation. The sequential nucleation and propagation of partial dislocation on adjacent parallel {111} planes are found to cause the thickening of the deformation twin. Moreover, the deformation twins can exist in VN at room temperature. (C) 2016 Elsevier B.V. All rights reserved.
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