Abstract
The electrochemical behaviors of Nd(Ⅲ) ions and the mechanism of Mg-Al-Nd alloys by co-reduction were studied in LiCl-NaCl-MgCl2 melts by cyclic voltammetry(CV). The results of CV indicates that Nd(Ⅲ) ion was reduced to Nd atom in two steps exchange 3 electrons: Nd(Ⅲ)+e-=Nd(Ⅱ) and Nd(Ⅱ)+2e-=Nd(0). The diffusion coefficients of Nd(Ⅲ) was calculated and found to be 4.92×10-5 cm2 s-1. Mg-Al-Nd alloy samples prepared by galvanostatic electrolysis were analyzed by XRD and SEM-EDS. Results indicate that when there is no Nd2O3 in the melts, the alloying phases are mainly Al12Mg17, Al0.58Mg0.42 and Mg phases. When 0.35% Nd2O3 was added into the melts, only Al2Nd and Mg phases exist in the alloy; Nd element mainly distributes at grain boundary, Al element distributes in grain boundary and cell, and Mg elements distribute in the whole alloy as the matrix of the alloy. Acknowledgement The work was financially supported by the National Natural Science foundation of China (11675044, 11575047, 21790373, 21271054 and 21173060), the Major Research plan of the National Natural ScienceFoundation of China (91326113 and 91226201), and the International Exchange Program of Harbin Engineering University for Innovation−oriented Talents Cultivation.
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