Abstract
The anisotropic elastic constants of a B2 structured iron aluminide FeAl (Fe-40 at. % Al) alloy at different temperatures are computed using Coulomb and Born Mayer model. The temperature dependent ultrasonic properties of the alloy along with other associated parameters are determined using the elastic constants. The correlation between the mechanical and thermal properties makes ultrasonic properties a suitable, nondestructive tool to study the physical state of FeAl alloy. The results of present investigation are discussed in correlation with the microstructural phenomenon like phonon-phonon interaction and the other thermophysical properties. Temperature dependence of ultrasonic attenuation along different crystallographic directions reveals some typical characteristic features.
Highlights
The growing importance of intermetallic compounds as materials for high-temperature applications has provoked intense research on structural, mechanical and thermal properties [1,2,3]
We have established a theoretical approach for the determination of the temperature dependent ultrasonic attenuation, thermal relaxation time and non-linearity parameters in filters [5-9]. Iron aluminides (FeAl)
Figure. 1 shows that the order of thermal relaxation time for FeAl is 10-13 second, which is same as in other intermetallics[31,32,33,34].this signifies that the circulation of thermal phonon maintain its equilibrium location in 10-13 s after passing the ultrasonic wave
Summary
The growing importance of intermetallic compounds as materials for high-temperature applications has provoked intense research on structural, mechanical and thermal properties [1,2,3]. Of particular interest are the transitional metal aluminides e.g. FeAl, NiAl and CoAl, which are resistant to corrosion and oxidation, have interesting magnetic properties [4], and are used as high-temperature structural materials and soft magnetic materials. Their high electrical resistivity which increases with temperature and low cost of production have made these intermetallics excellent candidates for various applications such as heating elements, insulation wrapping, tooling, catalytic converters, automotive exhaust manifolds, fabric and paper cutting, piping, and hot gas filters [5,6,7,8,9]. We have made attempt to correlate the ultrasonic properties with the thermophysical and mechanical properties of the compound for the characterization
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