Regensburg 2016 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 60: Microstructure and Phase Transformations III

MM 60.3: Talk

Thursday, March 10, 2016, 16:15–16:30, H39

Martensitic phase transformation of Fe₇₀Pd₃₀ ferromagnetic shape memory alloy thin films due to laser shock peening — •Alina J. Bischoff¹, Ariyan Arabi-Hashemi¹, Martin Ehrhardt¹, Pierre Lorenz¹, Klaus Zimmer¹, and Stefan G. Mayr^1,2 — ¹Leibniz-Institut für Oberflächenmodifizierung, Leipzig — ²Fakultät für Physik und Geowissenschaften, Universität Leipzig

The fcc-fct martensitic phase transformation induced by laser shock peening is analyzed in Fe₇₀Pd₃₀ ferromagnetic shape memory alloy thin films. At shockwave pressures of up to 2.5 GPa, X-ray diffraction and scanning electron microscopy measurements reveal formation of martensitic variants with preferred orientation of the shorter c-axis perpendicular to the surface plane. Consequential merging of growth islands on the film surface is observed. For a better understanding of the atomistics of these findings, twin boundary formation, which is characteristic of martensitic transition, as well as material shape change are further explored by classical molecular dynamics simulations.