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• W2959559900 endingPage "2934" @default.
• W2959559900 startingPage "2926" @default.
• W2959559900 abstract "Mo2AlB2 is a new MAB phase that has been observed in thin foils of MoAlB during TEM observation and in NaOH etched MoAlB samples. However, the structural characteristics, chemical bonding and properties of this new compound have not been investigated. In this work, geometry optimized crystal structure of Mo2AlB2 is obtained and its stability, elastic and thermal dynamic properties are investigated. Mo2AlB2 is stable in Al lean conditions, which is consistent with the exiting experimental results. It is also gauged as a damage tolerant or quasi-ductile ceramic based on the low Pugh’s shear to bulk modulus ratio (G/B = 0.544) and positive Cauchy pressure in all three crystallographic directions, which is underpinned by the metallic bonding. Mo2AlB2 also exhibits high stiffness which is attributed to the strong B–B covalent bond chains within its crystal structure. Due to the anisotropic chemical bonding, Mo2AlB2 has anisotropic thermal expansion coefficients αa = 6.19 × 10–6 K1, αb = 12.13 × 10−6 K–1, αc = 6.66 × 10−6 K–1, respectively, along a, b and c directions in the temperature range between 300 and 1500 K. The heat capacity from 300 to 1500 K can be described as Cp = 120.32 + 0.01648T − 2.597 × 106T−2 (J∙mol–1∙K–1). The elastic constants decrease almost linearly with temperature. The elastic constants representing the resistance to principle deformation (c11, c22 and c33) decrease in faster rates than those representing shear deformation resistance (c44, c55 and c66). Correspondingly, bulk and Young’s modulus decrease in faster rates than shear modulus. In light of the structure-property relations of Mo2AlB2, it is suggested that future damage tolerant ceramics can be designed by putting stiff covalent bonding units into soft metallic bonding box to obtain both high stiffness and quasi-ductility." @default.
• W2959559900 created "2019-07-23" @default.
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• W2959559900 date "2019-12-01" @default.
• W2959559900 modified "2023-10-17" @default.
• W2959559900 title "Theoretical prediction on the stability, electronic structure, room and elevated temperature properties of a new MAB phase Mo2AlB2" @default.
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• W2959559900 doi "https://doi.org/10.1016/j.jmst.2019.06.007" @default.
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