Abstract
The phonon dispersion of the high-temperature fcc phase of pure cobalt has been measured by inelastic neutron scattering at 833 K. Transverse phonon branches were measured above and below the Martensitic hcp-fcc transformation in order to learn about an influence of lattice dynamics, if any. No new anomalies could be observed, except those confirming an anomalous decrease of the ${c}_{44}$ (hcp) shear constant when approaching the transformation from below and those confirming a transverse $T{[00\ensuremath{\xi}]}_{\mathrm{hcp}}$ and $T{[\ensuremath{\xi}\ensuremath{\xi}\ensuremath{\xi}]}_{\mathrm{fcc}}$ branch of relative low energy. The small shear constant and results from an analysis of elastic diffuse and Bragg data can be understood in the framework of a dislocation-driven transformation mechanism proposed by Seeger.
Published Version
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