Phase Diagram of the Nd-Fe-B Ternary System

Abstract

An experimental study of the liquidus projection in a phase diagram of the Nd-Fe-B ternary system has been carried out. In the Nd-poor region, it is found that two phases, Fe₂B and Nd₂Fe₇B₆(T₂), coexist with the liquid. Two monovariant curves, L\rightleftharpoonsFe+Fe₂B and L\rightleftharpoonsFe₂B+T₂, join and form the transition reaction, L+Fe₂B\rightleftharpoonsT₂+Fe. The end point of the liquid in the Nd-poor regions is the ternary eutectic point, L\rightleftharpoonsFe+Nd₂Fe₁₄B(T₁)+T₂. The T₂ and Nd₂FeB₃(T₃) phases simultaneously solidify from the liquid. In the Nd rich region. T₁ phase, T₂ phase and (Nd) solid solution solidify from the liquid at the end point of the liquid.