Role of Annealing Twin in the Formation of Variant Structure of bct Martensite in Fe–Pd Alloy

A variant structure of bct martensite in Fe-Pd alloys was examined by transmission electron microscopy. The martensive variants constructing a colony which were transformed in a single crystal of austenite consisted of four kinds of variants belonging to a same «plane-group». On the other hand, the variants which were transformed from recrystallized austenite with annealing twins were composed two kinds of them belonging to a same plane group and two of their mirror symmetrical ones about the annealing twin plane