Acta Physica Sinica, Volume. 69, Issue 14, 140201-1(2020)
Medium entropy alloys have attracted much attention because of their excellent physical and chemical properties. Nano-scaled L12 structure ordered phase plays an important role in strengthening the mechanical properties of medium entropy alloys, and its local atomic arrangement plays a decisive role in yield strength of medium entropy alloys. In this paper, the microscopic mechanism of the precipitation process of Ni60Al20V20 medium entropy alloy is studied by using the micro diffusion phase field dynamics model, in which the probability of atoms to occupy the lattice position is taken as a field variable to describe the configuration of atoms and the morphology of precipitates. In this model, the shape and concentration of precipitate phase, the position and appearance of new phase cannot be set in advance. Combined with the inversion algorithm, the precipitation mechanism of ordered phases of γ' (L12-Ni3Al) and θ (DO22-Ni3V) is discussed by analyzing the evolution of atomic images, the change of order parameters and volume fraction. The result shows that two kinds of ordered phases are precipitated in the kinetical process of disordered phase ordering into Ni60Al20V20 medium entropy alloys, which are of
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Yi-Bo Yang, Yu-Hong Zhao, Xiao-Lin Tian, Hua Hou.
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Received: Jan. 22, 2020
Accepted: --
Published Online: Dec. 28, 2020
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