Martensitic transformation and magnetic properties in ferromagnetic shape memory alloy Ni43Mn46Sn11−xSix

► A magnetic field-induced martensite-to-austenite transformation was found in Ni43Mn46Sn10Si1. ► Ageing of the Si1 alloy at 673 K resulted in the formation of a precipitate. ► The main effect of ageing at 573 K is increasing the atomic ordering of the matrix. ► Solution treatment was effective to restore the transformation and magnetic properties.