Plastic accommodation of martensite in disordered and ordered iron–platinum alloys

The degree of order in iron–platinum austenite can be changed by heat treatment. Highly ordered austenite tends to transform into thermoelastic martensite, whereas non-thermoelastic martensite isformed from disordered austenite. This is because the ordered austenite is able to accommodate elastically the shape deformation brought about by the growth of martensite. In the present study, atomic force microscopy has been used to establish the nature of the shape deformation caused by both types of martensite. It is confirmed that the extent of plastic accommodation is larger when disordered austenite is induced to transform into martensite.MST/3232