Abstract
Phonon dispersion curves of austenitic stainless steels Fe–18Cr–16Ni–10Mn andFe–18Cr–12Ni–2Mo have been measured by triple-axis neutron spectroscopy. The data wereanalysed using Born–von Karman interactions as well as calculations including thecontribution of conduction electrons on the lattice dynamics. An appropriate description ofthe experimental data was obtained by taking into account two-neighbour shells plus thecontribution of the electron gas. The elastic constants and moduli obtained are close toreported results by ultrasonic studies on polycrystalline samples. The phonon densities ofstates in both systems calculated from the dispersion curves agree well with results obtainedby time-of-flight neutron spectroscopy on polycrystalline samples. The Debye temperatureΘ(T) shows a minimum around 40 K, similar to copper and nickel.
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