Computer simulation of ordered interphase boundary structure of Ni-Al-V alloy using microscopic phase-field method

The microscopic structure and evolution of ordered interphase boundary of Ni-Al-V alloy were investigated using microscopic phase-field model. The results show that three kinds of interphase boundaries are formed between LI₂ phases, the width of the interphase boundaries is narrower, and of which one kind of interphase boundary is in equilibrium for the occupation probability of Al atoms. According to the different orientation variants of [10] and [01] of the projection of D0₂₂, there form eight kinds of interphase boundaries structure, in which the interphase boundaries are wider with the same orientation variants, and the occupation probability of V atoms reaches the equilibrium value with different orientation variants. There are four kinds of interphase boundaries between the different phases. The occupation probability of atoms in the interphase boundaries reaches the equilibrium value and two phases transit continuously, for one phase precipitates from the interphase boundary of another. With the precipitation process, the interphase boundaries form in [01] direction of D0₂₂ transform from disordered to ordered and become narrower firstly and then dissolve into disordered phase.