実験観察とフェーズフィールド法の融合によるD0₃型Fe₃Al規則化易動度の確定

抄録

The growth kinetics of the antiphase domain (APD) in bulk intermetallic have long posed a challenge because of the variations in curvatures in 3D space. For instance, attempts to evaluate the ordering kinetics in D0₃-structured Fe₃Al and control the APD size have been made since the 1970s. However, the determined ordering kinetics to date exhibit significant discrepancies, and no synergistic studies have been conducted. In the present study, the shape coefficient, which correlates the growth rate of APD with 3-dimensional intricate shapes and the shrinking rate of 2-dimensional circular antiphase boundaries (APBs) was assessed through a comparative analysis of PF simulations using 2D- and 3Dmodels. Conversely, the kinetic of APD size evolution in bulk samples was determined using TEM observation. By incorporating the calculated shape coefficient and experimental results, we successfully derived accurate values of mobility for forming the D0₃-type ordered structure. This finding lays the foundation for optimizing heat treatment conditions to regulate APD structure and enhance the superelasticity of Fe₃Al. This methodology can be extended to estimate the ordering mobility of other intermetallic.