Thermophysical Properties of Solid and Liquid 90Ti-6Al-4V in the Temperature Range 1400 to 2300K Measured by Millisecond and Microsecond Pulse-Heating Techiniques

Published

January 1, 2002

Author(s)

E Kaschnitz, P Reiter, J L. McClure

Abstract

Heat capacity and electrical resistivity of 90Ti-6Al-4V in the temperature range 1400 to 2300 K were measured by two pulse-heating systems, operating in the millisecond and microsecond time regimes, respectively. The millisecond-resolution technique is based on resistive self-heating of a tube-shaped specimen from room temperature to melting in less than 500 ms and measuring current through the specimen, voltage drop along a defined portion of the specimen, and temperature of the specimen every 0.5 millisecond. The microsecond-resolution technique is based on the same principle using a rod-shaped specimen, but the heating rate is faster by a factor of 10,000 and data is recorded every 0.5 microsecond.Due to the rapid heating with the microsecond system, the specimen keeps its shape even in the liquid phase, and measurements were made up to approximately 300 K above the melting temperature. A comparison between the results obtained from the two systems with very different heating rates shows significant differences in the region of the phase transition from (α+β) to β and changes in the melting behavior. The very high heating rate of the microsecond system shifts the solid-solid phase transition to a higher temperature and melting of the specimen occurs with a temperature plateau instead of a temperature interval.

Citation

International Journal of Thermophysics

Volume

23 No. 1

Pub Type

Journals

Keywords

electrical resistivity, high temperatures, pulse heating, specific heat capacity, titanium alloy (90Ti-6Al-4V), transient techinques

Citation

Kaschnitz, E. , Reiter, P. and McClure, J. (2002), Thermophysical Properties of Solid and Liquid 90Ti-6Al-4V in the Temperature Range 1400 to 2300K Measured by Millisecond and Microsecond Pulse-Heating Techiniques, International Journal of Thermophysics (Accessed July 27, 2024)