Mechanical properties and twin boundary drag in Fe-Pd ferromagnetic shape memory foils—experiments and ab initio modeling

Details Mechanical properties and twin boundary drag in Fe-Pd ferromagnetic shape memory foils—experiments and ab initio modeling Mechanical properties and twin boundary drag in Fe-Pd ferromagnetic shape memory foils—experiments and ab initio modeling

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011njph...13f3034c&link_type=abstract

New Journal of Physics, Volume 13, Issue 6, pp. 063034 (2011).

Physics

1

Scientific paper

We report on vibrating reed measurements combined with density functional theory-based calculations to assess the elastic and damping properties of Fe-Pd ferromagnetic shape memory alloy splats. While the austenite-martensite phase transformation is generally accompanied by lattice softening, a severe modulus defect and elevated damping behavior are characteristic of the martensitic state. We interpret the latter in terms of twin boundary motion between pinning defects via partial 'twinning' dislocations. Energy dissipation is governed by twin boundary drag, primarily due to lattice imperfections, as concluded from the temperature dependence of damping and related activation enthalpies.

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