Special features of the deformation-induced order-disorder phase transition and its modeling

Methods of x-ray diffractometry are used to investigate the influence of plastic deformation on the state of the long-range order in alloys with the L1₂, L1₂(M), and L1₂(MM) superstructure. It is demonstrated that the heterogeneous order-disorder phase transition accompanied by intensive accumulation of antiphase boundaries occurs under plastic deformation. The antiphase boundaries play an important role in the destruction of long-range order. Based on the available experimental results, a model of destruction of long-range order is constructed that takes into account the dislocation mechanisms of accumulation of antiphase boundaries under deformation. __________ Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 1, pp. 9–24, January, 2006.