Effects of B2 nanoprecipitates on the phase stability and pseudoelastic behavior of Fe-Mn-Al-Ni shape memory alloys

P. LA ROCA; J. MEDINA; C.E. SOBRERO; M. AVALOS; J.A. MALARRIA; A. BARUJ; M. SADE

Amberes

Conferencia; European Conference on Martensitic Transformations (ESOMAT 2015); 2015

ESOMAT 2015

Samples of a Fe-Mn36-Al15-Ni7.5shape memory alloy were subjected to different thermal treatments at 200ºC(namely, for 0 s, 600 s, 1200 s and 3 h) in order to evaluate the evolution ofthe coherent precipitates related to the pseudoelastic behavior. Afterperforming the thermal treatments, samples were studied by means of electricalresistivity in experiments aimed at evaluating the effect of precipitation onthe martensitic transformation temperatures and at determining the possibleeffects of thermal cycling. Mechanical tests were performed to measure thedegree of pseudoelastic recovery for each thermally treated sample. Evidencesof pseudoelastic behavior were found even in samples subjected to a rathershort treatment such as 1200 s after three thermal cycles. Transmissionelectron microscopy (TEM) observations were performed in order to identify thedistribution and size of B2 nano-precipitates after the various thermal treatments