Influence of high pressure and a pulsed magnetic field on the martensite transformation in Fe?Ni and Fe?Ni?Mn alloys

Abstract

1. Omnilateral pressure, which reduces the martensitic point, does not alter the “explosive” character of the martensite transformation in type N31 Fe−Ni alloy. Omnilateral pressure greatly reduces the transformation rate for an isothermal martensite transformation (type N23G3 alloy) and causes a reduction in the temperature of the kinetic maximum. 2. Preliminary plastic deformation does not reduce the transformation temperature range for N31 alloy but causes a large decrease in the extent of the first and subsequent explosions. Preliminary plastic deformation of Fe−Ni−Mn alloys, which suppresses the isothermal transformation, causes almost no reduction in the extent of the athermal transformation in a magnetic field. Tempering of the austenite inhibits the isothermal transformation but has no effect on the athermal transformation excited by pulsed fields.