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本工作通过对Nd-Fe-B三元合金样品退火态显微组织的观察,以及微区成分分析和物相鉴定,确定了Nd-Fe-B成分三角在室温下平衡相区的划分。采用差热分析测量了Nd-Fe-B合金的相变点,绘制了Nd=11.76at。％、B≤44.56at。％和B=5.88at。％、Nd≤45.41at。％两个三元垂直剖面相图。这两个剖面相交于Nd_2Fe_(14)B化合物相的正分点,因此,专门讨论了Nd_2Fe_(14)B合金的热分析曲线,结果发现:Nd_2Fe_(14)B合金从液态冷却凝固时,Nd_2Fe_(14)B相的析出是经包晶反应完成的,该合金的铸态形貌也充分说明了这一点。
In this work, the microstructure of the Nd-Fe-B ternary alloy was observed by annealing, as well as the microstructure analysis and phase identification to determine the division of the equilibrium phase region of the Nd-Fe-B composition triangle at room temperature. The phase transformation temperature of Nd-Fe-B alloy was measured by differential thermal analysis, and the Nd = 11.76at was drawn. %, B≤44.56at. % And B = 5.88at. %, Nd≤45.41at. % Two ternary vertical profile phase diagram. Therefore, the thermal analysis curves of Nd 2 Fe 14 B alloy are discussed. The results show that when Nd 2 Fe 14 B alloy is cooled and solidified from liquid, (14) The precipitation of phase B is completed by the peritectic reaction, and the as-cast morphology of the alloy fully demonstrates this point.