Abstract
The effect of an axial magnetic field on the solidification structure in directionally solidified Ni-21.5Al-0.4Zr-0.1B (at. pct) alloy was investigated. The experimental results indicated that the application of a high magnetic field caused the deformation of dendrites and the occurrence of columnar-to-equiaxed transition (CET). The magnetic field tended to orient the 〈001〉 crystal direction of the equiaxed grains along the magnetic field direction. The bulk solidification experiment under a high magnetic field showed that the crystal exhibited magnetic crystalline anisotropy. Further, the thermoelectric (TE) magnetic force and TE magnetic convention were analyzed by three-dimensional (3-D) numerical simulations. The results showed that the maximum value of TE magnetic force localized in the vicinity of the secondary dendrite arm root, which should be responsible for the dendrite break and CET. Based on the high-temperature creep mechanism, a simple model was proposed to describe the magnetic field intensity needed for CET: \( B \ge kG^{ - 1.5} R^{1.25} \). The model is in good agreement with the experiment results. The experimental results should be attributed to the combined action of TE magnetic effects and the magnetic moment.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant Nos. 51604172, 51690162, and U1560202), the United Innovation Program of Shanghai Commercial Aircraft Engine (AR911), the program of Youth Eastern Scholar (QD 2015035), and the CHENGUANG project from the Shanghai Municipal Education Commission.
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Manuscript submitted February 13, 2017.
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Liu, H., Xuan, W., Xie, X. et al. Columnar-to-Equiaxed Transition and Equiaxed Grain Alignment in Directionally Solidified Ni3Al Alloy Under an Axial Magnetic Field. Metall Mater Trans A 48, 4193–4203 (2017). https://doi.org/10.1007/s11661-017-4173-z
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DOI: https://doi.org/10.1007/s11661-017-4173-z