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The single crystal elastic constants of hexagonal SiC to 1000°C

1988; Elsevier BV; Volume: 4; Issue: 1 Linguagem: Inglês

10.1016/0267-3762(88)90060-4

1878-2892

Zhuyong Li, R. C. Bradt,

MXene and MAX Phase Materials

The relationships between the sound velocities in the cubic and hexagonal crystal structures and the tensor transformations for the two structures are applied to determine the elastic stiffnesses, Cij and (dCij/T) for the hexagonal structures of SiC to 1000°C. These results are then applied to calculate the polycrystalline elastic moduli, E and G, and their temperature variations. The calculated values for E and G at 20°C are 420 and 180 GPa and for (dE/dT) and (dG/dT) the values are −0·020 and −0·007 (GPa/°C), respectively. These agree well with published experimental values for E and G of dense polycrystalline alpha silicon carbides.