New observations on formation of thermally induced martensite in Fe-30%Ni-1%Pd alloy

Abstract

Kinetical, morphological, crystallographical and thermal characteristics of thermally induced martensite in an Fe-30%Ni-1%Pd alloy has been studied by scanning electron microscopy (SEM), transmission electron microscopy (TEM), differential scanning calorimetry (DSC) and X-ray diffraction method. Kinetics of transformation was found to be as athermal. SEM and TEM observations and X-ray method revealed α' (bcc) martensite formation in the austenite phase of alloy by thermal effect. The crystallographic orientation relationship between austenite and α' (bcc) martensite was found to be having Kurdjumov-Sachs (K-S) type relationship. In addition, the lattice parameters of austenite and martensite phases were calculated from X-ray diffraction patterns. © Indian Academy of Sciences.