Elastic constants of polycrystalline Ti3AlC2 and Ti3SiC2 measured using coherent inelastic neutron scattering |
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| Authors: | Veronica Gray Erich H. Kisi Oliver Kirstein Anton P. J. Stampfl |
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| Affiliation: | 1. School of Engineering, University of Newcastle, Callaghan, New South Wales, Australia;2. European Spallation Source ESS AB, Lund, Sweden;3. Bragg Institute, Australian Nuclear Science and Technology Organisation, Lucas Heights, New South Wales, Australia |
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| Abstract: | The magnitude of the single‐crystal elastic constant c44 in the MAX phase Ti3SiC2 is under debate. In this paper, estimates for the magnitude of c44 for MAX phases Ti3AlC2 and Ti3SiC2 are determined from a partially oriented polycrystalline sample via coherent inelastic neutron scattering. The largely quasi‐isotropic nature of these Mn+1AXn phase elastic constants as previously predicted by density functional theory calculations is confirmed experimentally for Ti3AlC2 to be c44=115.3 ± 30.7 GPa. In contrast, Ti3SiC2 is confirmed to be shear stiff with c44=402.7 ± 78.3 GPa supporting results obtained by earlier elastic neutron diffraction experiments. |
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| Keywords: | anisotropic elastic moduli inelastic neutron scattering MAX phase shear stiffness |
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