Abstract
Abstract The influence of hydrostatic pressure and magnetic fields on the athermal and the isothermal martensitic transformations in Fe-29.9at.% Ni, Fe-31.7at.% Ni, Fe-32.3 at.% Ni, Cu-29.1 at.% Al-3.6 at.% Ni and Fe-24.0 at.% Ni-4.0 at.% Mn alloys have been examined in order to clarify the difference between the athermal and isothermal transformation processes. The following results were obtained. Firstly, a martensitic transformation occurs after some incubation time during isothermal holding at a temperature higher than the transformation start temperature Ms in zero external field and no hydrostatic pressure for Fe-Ni and Cu-Al-Ni alloys which originally exhibit athermal martensitic transformations. Secondly, athermal martensitic transformations in Fe-Ni alloys change to isothermal transformations under hydrostatic pressure. Thirdly, in the isothermal martensitic transformation in an Fe-Ni-Mn alloy, a static magnetic field lowers the nose temperature and increases the incubation time reauired for the ...
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