Dynamic Model of the Formation of an Intermediate Mesorcopic State During B2 → B19 Martensitic Transformation

Morphological characteristics of martensite after B2-B19 transformation are considered within the limits of the concept of the control wave process. It is demonstrated that there is a possibility for the fast formation of an intermediate mesoscopic state. The instability of this state for the subsequent transition to final strains is supposed. © 2013 Springer Science+Business Media New York.Our analysis has demonstrated that the two-stage variant of implementation of the В19 phase in crystals is possible. The first stage is associated with the fastest strain of one of the family of planes {110}B2 with incomplete tensile strain attained in the second stage. In essence, the first stage leads to the fast formation of the intermediate mesoscopic state in which two lattice parameters differ from their final values. It is not excluded that the В2 → IMS → B19 transformation is competitive with the direct channel B2 → B19, and the sequence В2 → IMS → B19′ is even preferable compared to the channel B2 → B19 → B19′. This work was supported in part by the Russian Foundation for Basic Research (Project No. 11-08-96020)