Journal
MATERIALS RESEARCH EXPRESS
Volume 10, Issue 8, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/2053-1591/acf2e9
Keywords
Al-Nb-B refiner; aluminum alloy; phase field method; CALPHAD
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In this study, the grain-refining effect of Al-Nb-B refiner in wrought Al alloys was investigated using phase-field simulation and experiment methods. The addition of 0.03 wt% Nb significantly reduced the grain size, which further decreased with the addition of more refiner. The simulation and experimental results showed quantitative agreement, demonstrating that the addition of Al-Nb-B refiner can provide high-quality and stable heterogeneous nucleation particles.
In this paper, the grain-refining effect of Al-Nb-B refiner in wrought Al alloys and corresponding refining mechanism was investigated using phase-field simulation and experiment methods. Through experimental statistics and data correction, the seed radius introduced by Al-Nb-B refiner into Al alloy melt and the corresponding quantitative density distribution data were obtained, and a seed density model (SDM) model has been established. On this basis, a multi-phase field method (MPFM) combined with the calculation of phase diagram (CALPHAD) has been employed to simulate the & alpha;-Al grain evolution of Al-Mg-Si alloy during the solidification process with the help of thermodynamic database. Experimental studies showed that the addition of 0.03 wt% Nb (Adding by Al-1.93Nb-0.22B master alloy) significantly reduced the grain size from 956.4 & mu;m to about 219.4 & mu;m, and the grain size slowly decreased to 192.3 & mu;m by continuing to add refiner to 0.09 wt% Nb. Meanwhile, the simulation results demonstrated that after the addition of refiners, dendrite morphology transformed from the relatively developed dendrites with secondary and tertiary dendrites to a fine and uniform equiaxed shape. Simulation and experimental studies showed quantitative agreement. In addition, the results also prove that the addition of Al-Nb-B refiner can provide high-quality and stable heterogeneous nucleation particles.
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