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Mechanical Properties of DO3 Based on First Principles

School of Mechanical Engineering, University of Science and Technology Beijing, No. 30, Xueyuan Road, Haidian District, Beijing 100083, China
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Crystals 2020, 10(6), 488; https://doi.org/10.3390/cryst10060488
Received: 22 May 2020 / Revised: 30 May 2020 / Accepted: 4 June 2020 / Published: 7 June 2020
The elastic constants, ideal strength, band structure and electronic density state of Fe3Si (DO3) under triaxial tension and triaxial compression were studied using the first principle. The structural parameters calculated at zero pressure are consistent with the experimental results. The dependence of elastic constant and strain can be obtained using static finite strain technique. The ideal triaxial tensile and compressive strength of DO3 were studied by calculating the stress–strain relationship. The micro mechanism that affects the stability of the structure was analyzed using the results of electronic structure calculation. The results showed that the compressive strength of DO3 structure is higher than the tensile strength. When the stress of cell structure exceeds a limit, the covalent bond of Fe–Si is destroyed, resulting in the sudden decrease of G and E and the abnormal change of electronic density of state. View Full-Text
Keywords: stress–strain relationship; ideal strength; modulus of elasticity; band structure; electronic density state stress–strain relationship; ideal strength; modulus of elasticity; band structure; electronic density state
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Zhang, Q.; Huang, G.; Li, S. Mechanical Properties of DO3 Based on First Principles. Crystals 2020, 10, 488.

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