Application of Laser Polarimetry to the Measurement of Specific Heat Capacity and Enthalpy of the Alloy 53Nb–47Ti (mass%) in the Temperature Range 1600 to 2000 K by a Millisecond-Resolution Pulse Heating Technique

Abstract

The determination of the specific heat capacity, enthalpy, and electrical resistivity of the alloy 53Nb–47Ti (mass%) in the temperature range 1600 to 2000 K is described. The method is based on rapid resistive self-heating of a solid cylindrical specimen from room temperature to the maximum temperature of interest by the passage of a subsecond-duration electric current pulse through the specimen and on simultaneously measuring the pertinent experimental quantities. The experimental quantities measured are the current through the specimen, voltage drop across the effective specimen, specimen radiance temperature at two wavelengths, and normal spectral emissivity of the specimen. The present study extends this technique, previously applied to pure metals, to the determination of specific heat capacity and enthalpy of the alloy, 53Nb–47Ti. The measured properties were compared to those calculated from a thermodynamic description of the Nb–Ti system.