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Effects of chromium on structure and mechanical properties of vanadium:A first-principles study |
Gui Li-Jiang (桂漓江)a, Liu Yue-Lin (刘悦林)b, Wang Wei-Tian (王伟田)b, Zhang Ying (张颖)a, Lü Guang-Hong (吕广宏)a, Yao Jun-En (姚骏恩)a |
a Department of Physics and Key Laboratory of Micro-nano Measurement-Manipulation and Physics (Ministry of Education), Beihang University, Beijing 100191, China;
b Department of Physics, Yantai University, Yantai 264005, China |
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Abstract Stability and diffusion of chromium (Cr) in vanadium (V), the interaction of Cr with vacancies, and the ideal mechanical properties of V are investigated by first-principles calculations. A single Cr atom is energetically favored in the substitution site. Vacancy plays a key role in the trapping of Cr in V. A very strong binding exists between a single Cr atom and the vacancy with a binding energy of 5.03 eV. The first-principles computational tensile test (FPCTT) shows that the ideal tensile strength is 19.1 GPa at the strain of 18% along the [100] direction for the ideal V single crystal, while it decreases to 16.4 GPa at a strain of 12% when one impurity Cr atom is introduced in a 128-atom V supercell. For shear deformation along the most preferable {110}<111> slip system in V, we found that one substitutional Cr atom can decrease the cleavage energy (γcl) and simultaneously increase the unstable stacking fault energy (γus) in comparison with the ideal V case. The reduced ratio of γcl/γus in comparison with pure V suggests that the presence of Cr can decrease the ductility of V.
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Received: 20 January 2013
Revised: 23 May 2013
Accepted manuscript online:
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PACS:
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61.82.Bb
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62.20.-x
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(Mechanical properties of solids)
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71.15.Mb
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(Density functional theory, local density approximation, gradient and other corrections)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51061130558) and the Natural Science Foundation of Shandong Province of China (Grant No. ZR2011AM014). |
Corresponding Authors:
Liu Yue-Lin, Lü Guang-Hong
E-mail: liuyl@ytu.edu.cn;lgh@buaa.edu.cn
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Cite this article:
Gui Li-Jiang (桂漓江), Liu Yue-Lin (刘悦林), Wang Wei-Tian (王伟田), Zhang Ying (张颖), Lü Guang-Hong (吕广宏), Yao Jun-En (姚骏恩) Effects of chromium on structure and mechanical properties of vanadium:A first-principles study 2013 Chin. Phys. B 22 106109
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