COMPUTATIONAL THERMODYNAMICS APPROACH FOR PHASE PREDICTION OF Ni-BASED ALLOY
Abstract
CALPHAD (Calculation of Phase Diagrams) is a computational method used to predict the thermodynamic properties and phase behavior of materials based on their chemical composition. It has found extensive application in the development of advanced lightweight metallic materials. In the present study, a computational thermodynamic method was employed to investigate aspects of microstructure during the rapid solidification of a Ni-based alloy, specifically, a Ni-Al-Cr alloy with a Cr/Al ratio of 2:1. CALPHAD modeling was utilized to predict solidification behavior using the Classic Scheil-Gulliver solidification model. Additionally, the volume fractions of the main solidified phases and structures were predicted. According to the thermodynamic calculations, the main predicted structures were γ, FCC_L12 (γ’), and BCC_B2 microstructures.
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