Thermophysical properties of Ni-containing single-phase concentrated solid solution alloys
Abstract Temperature dependent thermophysical properties, including specific heat capacity, lattice thermal expansion, thermal diffusivity and conductivity, have been systematically studied in Ni and eight Ni-containing single-phase face-centered-cubic concentrated solid solution alloys, at elevated temperatures up to 1273K. The alloys have similar specific heat values of 0.4–0.5J·g −1 ·K −1 at room temperature, but their temperature dependence varies greatly due to Curie and K-state transitions. The lattice, electronic, and magnetic contributions to the specific heat have been separated based on first-principles methods in NiCo, NiFe, Ni-20Cr and NiCoFeCr. The alloys have similar thermal expansion behavior, with the exception that NiFe and NiCoFe have much lower thermal expansion coefficient in their ferromagnetic state due to magnetostriction effects. Calculations based on the quasi-harmonic approximation accurately predict the temperature dependent lattice parameter of NiCo and NiFe with Highlights Control thermophysical properties of concentrated solid solution alloys by varying compositional complexity. Magnetic state and possible short-range ordering affect the temperature dependence of specific heat in alloys. NiFe and NiCoFe alloys show strong magnetostriction effects at their ferromagnetic state. Cr is a critical alloying elements that dramatically reduces the thermal conductivity of these alloys Graphical abstract [DISPLAY OMISSION]
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