High-temperature thermal transport properties of a single-grain decagonal ${\mathrm{Al}}_{74}{\mathrm{Ni}}_{10}{\mathrm{Co}}_{16}$ quasicrystal

Thermal transport properties have been determined for a decagonal ${\mathrm{Al}}_{74}{\mathrm{Ni}}_{10}{\mathrm{Co}}_{16}$ quasicrystal in the temperature range 373–873 K. Differential scanning calorimetry and a laser flash method were employed in the determination of heat capacity and thermal diffusivity, respectively. Thermal conductivity was determined from the product of diffusivity, heat capacity, and density. A high degree of anisotropy was observed between the aperiodic and periodic axes. The anisotropic heat flow is described using the thermal ellipsoid model. The model was applied to a surface oriented 45° to the major axes and substantiated from bulk measurements obtained from a sample cut along this orientation. Within this temperature range, the thermal transport of this two-dimensional quasicrystal may be described in a manner similar to anisotropic metallic single crystals.