Key role of transformation twins in comparison of results of crystal geometric and dynamic analysis for thin-plate martensite

Abstract

The experimental data on the ratio of transformation twins fractions for crystals of thin-plate α-martensite (with the habit planes of the 2 5 9γ-3 10 15γ type) are considered. It is shown that the dynamic theory of the martensite crystals formation is free from the difficulties encountered in the formal crystal geometric approach. The intervals of parameter values that correspond to the observed fractions of the twin component, δtw, within the same crystal are given. The absence of twinning in thin plate-like crystals, which sometimes are observed in experiments on the γ-α martensite transformation induced by strong mag- netic field is discussed.