Thermophysical Measurements on 90Ti-6AI-4V Alloy Above 1450 K Using a Transient (Subsecond) Technique

Abstract

Simultaneous measurements are described of specific heat capacity, electrical resistivity and hemispherical total emittance of the ternary alloy 90Ti-Al-4V in the temperature range 1450 to 1900 K, and the melting point and and the radiance temperature at the melting point of the alloy by a subsecond duration transient technique. The results are expressed by the relations: cp=1.3833−9.943×10−4T+3.745×10−7T2ρ=152.65+1.9304×10−2T−3.9548×10−6T2where cp is in J · g−1 · K−1, ρ is in μΩ · cm, and T is in K. The value of the hemispherical total emittance is 0.39 in the range 1700 to 1900 K. The melting point and the radiance temperature at the melting point are 1943 and 1796 total emittance of the ternary alloy 90Ti-6Al-4V in the temperature range 1450 to 1900 K, and the melting point 0.395. Estimated inaccuracies of measured properties are: 3 percent for specific heat capacity, 1 percent for electrical resistivity, 5 percent for hemispherical total emittance and 8 K for melting point and radiance temperature at the melting point.