Elastic properties and phonon conductivities of Ti₃Al(C_0.5,N_0.5)₂and Ti₂Al(C_0.5,N_0.5) solid solutions

Herein we compare the lattice parameters, room temperature shear and Young’s moduli, and phonon thermal conductivities of Ti₂AlC_0.5N_0.5and Ti₃Al(C_0.5, N_0.5)₂solid solutions with those of their end members, namely Ti₂AlC, Ti₂AlN, Ti₃AlC₂, and Ti₄AlN_2.9. In general, the replacement of C by N decreases the unit cell volumes and increases the elastic moduli and phonon thermal conductivities. The increase in the latter two properties, however, is sensitive to the concentrations of defects, most likely vacancies on one or more of the sublattices.