Abstract
The effects of an axial high magnetic field on the microstructure evolution, solute distribution, and preferred crystallography relationship in the directionally solidified Cu–15.6 wt pctGe peritectic alloy were investigated. According to the experimental results, the application of a high magnetic field resulted in the columnar-to-equiaxed transition (CET) of the primary dendrites, the change of peritectic phase fraction, and the modification of the crystallography relationship between peritectic two phases. Numerical simulations were performed that revealed that the thermoelectric (TE) magnetic force imposed on the dendrite could be responsible for the occurrence of the CET. It was also found that the TE magnetic convection formed in the liquid-α-ξ phase junction region and obviously influenced the solute distribution. Indeed, under lower magnetic fields (B < 0.5 T), the TE magnetic convection increased with the magnetic field and made the Ge solute float upwards. However, under higher magnetic fields (B > 0.5 T), the TE magnetic convection gradually decreased and was compressed to the peritectic reaction interface with the increase of the magnetic field. As a result, the lower magnetic field decreased the fraction of the peritectic ξ-phase because of the solute floating effect while the higher magnetic field increased the fraction of the peritectic ξ-phase by promoting the peritectic interface reaction. Moreover, due to the formation of the TE magnetic force and the magnetization force in the peritectic two phases, the crystallography orientation relationship between the peritectic two phases was modified.
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Acknowledgments
This work was financed by the National Natural Science Foundation of China (Nos. 51904183 and 52130204), and the Independent Research and Development Project of State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, Shanghai University (No. SKLASS 2021-Z07), and the Science and Technology Commission of Shanghai Municipality (Nos. 19DZ2270200 and, 20511107700).
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Long, Z., Hu, S., Wang, T. et al. Effect of High Magnetic Field on Microstructure Evolution, Solute Distribution, and Crystallography in Directionally Solidified Cu–Ge Peritectic Alloy. Metall Mater Trans A 54, 3186–3198 (2023). https://doi.org/10.1007/s11661-023-07087-9
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DOI: https://doi.org/10.1007/s11661-023-07087-9