Measurement of Thermal Diffusivity of Intermetallic Compound TiAl Base Alloys.

概要

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Thermal diffusivities of intermetallic compound TiAl base alloys have been examined in the temperature range 300 to 900K under a vacuum of 1 mPa. Testing samples are listed in Table 1. Measureing method of thermal diffusivity is based on both the direct electrical heating method and the so- called Laplace transform method. Simultaneous measurements of electrical resistivity, thermal expansion and total hemispherical emittance were performed prior to measuring thermal diffusivity. The precision of the thermal diffusivity is estimated to be less than 10%. As a result, Ti-36wt%Al has a fairly ordered crystal structure with the existence of covalent bond, and thereby its thermal diffusivity is 67% higher than those of the other samples. Such singularity of the thermophysical properties of TiAl base alloys is found to originate only in Ti-36wt%Al.
日本熱物性学会の論文