Microstructure of peritectic Tb-Dy-Fe alloys after electromagnetic levitation melting

来源期刊：中国有色金属学报(英文版)2003年第4期

论文作者：马伟增 郑红星 季诚昌 李建国

文章页码：933 - 937

Key words：electromagnetic levitation melting；Tb-Dy-Fe alloys；peritectic；coupled growth

Abstract: The electromagnetic levitation melting of the rare earth giant magnetostrictive materials Tb_0.27Dy_0.7Fe_1.90 alloys is realized. The compound is difficult to realize levitation melting at terrestrial environment because of its high density and low electric conductivity. The microstructure of the sample near peritectic composition obtained by this process contains REFe₂ matrix phase, a large amount of rod-like REFe₃ phase embedded in the matrix phase, rare earth rich phase enriching around the REFe₃ phase and a small amount of rare earth rich phase in the REFe₂ matrix phase far from the REFe₃ phase, which is significantly different from that of the sample obtained by general melting-casting process with the same composition，which contains almost complete REFe₂ phase and a small amount of RE rich phase in the REFe₂ matrix phase. The formation of the microstructure can be attributed to the coupled growth of the peritectic phase—REFe₂ and the primary phase—REFe₃ , and the subsequent eutectic reaction under this experimental condition.