Effects of mechanical loading on the magnetic and dynamic properties of engineering materials

Abstract

The influence of strain on the magnetic and dynamic properties of ARMCO iron has been characterized by Mossbauer spectroscopy and by Nuclear Inelastic Scattering of synchrotron radiation. The Mossbauer spectra, taken in backscattering geometry, reveal that the magnetic texture in these materials is depending on the type of mechanical loading, monotonic or cyclic, respectively. The applicability of Nuclear Inelastic Scattering for the investigation of the dynamic properties of these macroscopic bulk-engineering materials is shown. The so obtained phonon density of states of a monotonically loaded specimen shows slight differences in its shape and spectral features in comparison to the initial state. An influence of dislocations is also reflected in theoretically calculated phonon density of states based on classical molecular dynamics simulations.