Elastic constants of polycrystalline Ti₃AlC₂ and Ti₃SiC₂ measured using coherent inelastic neutron scattering

Title: Elastic constants of polycrystalline Ti₃AlC₂ and Ti₃SiC₂ measured using coherent inelastic neutron scattering
Creator: Gray, Veronica; Kisi, Erich H.; Kirstein, Oliver; Stampfl, Anton P. J.
Relation: Journal of the American Ceramic Society Vol. 100, Issue 2, p. 705-712
Publisher Link: http://dx.doi.org/10.1111/jace.14600
Publisher: Wiley-Blackwell
Resource Type: journal article
Date: 2017
Description: 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 M_n+1AX_n 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.
Subject: anisotropic; elastic moduli; inelastic neutron scattering; MAX phase; shear stiffness
Identifier: http://hdl.handle.net/1959.13/1387646
Identifier: uon:32643
Identifier: ISSN:0002-7820
Language: eng
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