Determination of thermal diffusivity and thermal conductivity of Fe-Al alloys in the concentration range 22 to 50 at.% Al

The thermal diffusivity of Fe-Al alloys in the concentration range 22 to 50 at.% Al was measured within a temperature range of 20 to 600 degreesC. The thermal diffusivity of the Fe-25 and 28 at.% Al alloys decreases with incr easing temperature up to the Curie temperature, and then it increases up to the temperature when the D0(3) <----> B2 transformation occurs. The therma l diffusivity of Fe-22 at.% Al alloys increases with rising temperature up to the temperature when the D0(3) <----> B2 transformation occurs, and then it decreases. A further decrease in thermal diffusivity follows up to the Curie temperature. The thermal diffusivity of Fe-34 and Fe-40 at.% Al incre ases monotonically with the rising temperature. The thermal diffusivity of Fe-50 at.% Al alloys decreases only up to 100 degreesC, and does not change any further with increasing temperature. Thermal conductivity is the highe st for Fe-25 and Fe-50 at.% Al alloys at room temperature. Thermal conducti vity rises for all studied alloys with increasing temperature. The smallest increase was registered for Fe-25 at.% Al alloys.