Transport Properties of Polycrystalline Ni3Al
Recent advances in ductilizing the intermetallic compound Ni3A1 may lead to practical applications. These applications, which are based on the outstanding strength and oxidation resistance of the compound, also require physical property data. In this paper, the room-temperature electrical and thermal conductivities of annealed high purity specimens containing 74 to 76 at. % Ni are presented and compared to theoretical predictions. Residual (4.2 K) electrical resistivity data are also employed in the analysis and these results show a pronounced minimum at the stoichiometric composition. The data show that the thermal conductivity of this compound is quite sensitive to stoichiometry and, at room temperature, has a maximum value at about 74.8 at.% Ni. Calculated and experimentally derived phonon thermal conductivity values agree well, and indicate that this carrier is responsible for about 25% of the room temperature thermal conductivity. The electronic Lorenz function is essentially equal to the Sommerfeld value.
KeywordsElectrical Resistivity Seebeck Coefficient Specific Heat Data Electrical Resistivity Data Phonon Conduc
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