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First-Principles Investigation of the Structural, Mechanical, and Thermodynamic Properties of Hexagonal and Cubic MoAl5 Alloy

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Abstract

The improvement in overall properties is a big challenge for the development of high-temperature materials. The refractory Al-rich MoAl5 is a potential high temperature alloy due to the excellent oxidation resistance and high mechanical properties. However, the correlation between structural and overall properties of MoAl5 is unclear. In this work, the structural stability, elastic and thermodynamic properties of MoAl5 are studied by the first-principles calculations. Two phases: hexagonal and cubic structures, are considered. The result shows that the hexagonal MoAl5 is a table phase. Compared to the cubic MoAl5, the hexagonal MoAl5 exhibits high bulk modulus, shear modulus and Young modulus due to the strong localized hybridization between Mo and Al. Here, it is found that the calculated bulk modulus, shear modulus and Young modulus of the hexagonal MoAl5 are 119, 98 and 230GPa. Finally, the high temperature thermodynamic properties of MoAl5 are related to the vibration of Al atom and Al-Mo bond, which is demonstrated by the density of state and chemical bonding.

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Acknowledgments

This work is supported by the State Key Laboratory of Advance Technology for Comprehensive Utilization of Platinum Metals (Grant No. SKL-SPM-201816).

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  1. School of New Energy and Materials, Southwest Petroleum University, Chengdu, 610500, China

    Yong Pan

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Pan, Y. First-Principles Investigation of the Structural, Mechanical, and Thermodynamic Properties of Hexagonal and Cubic MoAl5 Alloy. J. of Materi Eng and Perform 30, 8289–8295 (2021). https://doi.org/10.1007/s11665-021-06055-x

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