Details of structure transformations in pure uranium and U-Mo alloys: Insights from classical atomistic simulation

A strong anisotropy of interatomic interaction in pure uranium makes possible a variety of feasible structure transformations in this metal. With classical atomistic simulation we consider several unusual aspects of such transformations occurring in pure uranium and U-Mo alloys. A special focus is put on α−γ and γ0−γ transitions, which are discussed in details taking into account their similarity. Regarding the question of γ-phase stabilization, we discuss the quasi-bcc structure of this phase and Elinvar effect seen from calculations of elastic moduli in γ-U-Mo alloys.