Abstract
Structure, phase transformation and magnetic properties of mechanically alloyed (MA) Nd y Fe 100−1.5 y C 0.5 y , Nd 16Fe 84− m C m and Nd n Fe 92− n C 8, alloys depend sensitively on the compositions and the annealing temperatures. Nd 2Fe 14C can be formed by a solid state reaction of α-Fe with Nd 2C 3 as well as by a reaction of Nd 2Fe 17C x with Nd–C compounds. The thermal stability of Nd 2Fe 14C increases with the increase of carbon content, reaches a maximum and then decreases. Nd 2Fe 14C is stable in a triangular shaped area in a status diagram with axes of annealing temperature and composition. To make Nd 2Fe 14C the main phase, the Nd:C ratio must be kept within a certain range, because too little carbon leads to Nd 2Fe 17C x as the main phase, and too much carbon increases the α-Fe content, inhibiting the formation of Nd 2Fe 14C.
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