Measurements of Heat Capacity of Pure Titanium and Zirconium by Electromagnetic Levitation

Abstract

The heat capacity of titanium and zirconium was measured in the temperature range from approximately 1,300 K to 1,800 K . The measurement technique is based on the modulated power method originally proposed by Fecht and Johnson. The heat capacity of a sample can be derived from the sample's temperature response to the modulated electromagnetic heating power if the sample's total hemispherical emissivity is known. The experiments were performed using an electromagnetic levitator. The solid titanium and zirconium samples were suspended in the center of an induction coil with a very small diameter (0.15 mm) Pt (87 %)-Rh (13 %) wire. The heat capacity measurements of titanium and zirconium are presented, and the uncertainty is estimated to be ±3 %.

Effects of Effective Dendrite Size on Tensile Deformation Behavior in Ti-Based Dendrite-Containing Amorphous Matrix Composites Modified from Ti-6Al-4V Alloy

“…[25] The specific heat of titanium is about twice higher than that of zirconium, while its thermal conductivity is almost same to that of zirconium. [26][27][28] Considering the K t , C p , and T l of the LM2 composite, titanium, and zirconium, thus, the cooling rates of the T1, T3, T5, T7, and T10 composites are calculated to be about 2.4 9 10 4 , 2.5 9 10 3 , 1.0 9 10 3 , 4.9 9 10 2 , and 2.4 9 10 2 K/s, respectively. The composite sheets were polished in diamond pastes, etched by a solution of 40 mL HF, 20 mL HNO 3 , 40 mL HCl, and 200 mL H 2 O, and observed by a scanning electron microscope (SEM, model; JSM-6330F, Jeol, Japan).…”