Study of the martensitic transition in Ni-Mn-Sn-Ti ferromagnetic shape memory alloys

In the present work, mechanical spectroscopy measurements as a function of temperature and strain have been performed in (at.%) Ni50Mn37Sn13-xTix (x=0, 0.5 and 2) ferromagnetic shape memory alloys in order both to study martensitic transition phenomenon and also to determine its temperature of appearance. For mechanical spectroscopy measurements, a five elements piezoelectric device recently developed has been used. In addition, other characterization techniques as, differential thermal analysis and superconducting quantum interference magnetic spectroscopy, were also used. Besides, relaxation processes near the martensitic transition temperature have been also observed. This work has been carried out with the financial support of the CONICET-PIP 2098 and 0179, and the PID-UNR; ING 453 (2014-2017). Authors also wish to acknowledge to the Cooperation Agreement between the Universidad Pública de Navarra and the Universidad Nacional de Rosario, Res. 5789/2013 and Res. 3247/2015, and Universidad del País Vasco and the Universidad Nacional de Rosario, Res. CS.788/89 – 1792/2003, UPV224.310-14553/02, Res. 3469/2007, Res. CS. 124/2010 and Res. 3243/2015.