Dynamic scaling behaviour of late-stage phase separation in Ni₇₅Al_xV_25-x alloys

The dynamic scaling behaviour of late-stage phase separation and coarsening mechanisms of L1₂ and D0₂₂ in Ni₇₅Al_xV_25-x (3 \leq x \leq 10, at.%) alloys are studied using the microscopic phase-field dynamic model. The microelasticity field is incorporated into the diffusion dynamic model. The results show the morphology and coarsening dynamics being greatly changed by the elastic interactions among different precipitates, the particles aligning along the dominant directions, the average domain size (ADS) of L1₂ and D0₂₂ deviating from the exponent of temporal power-law, and the growth slowing down due to the increasing of elastic interactions. The dynamic scaling regime of late-stage coarsening of the precipitates is attained. Thus the scaling behaviour of structure function is also applicable for elastic interaction systems. It is also found that the variations of ADS and scaling function depend on the volume fraction of precipitates.