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An isothermal section of the Mg-Nd-Gd ternary system at 723 K was established by diffusion triple technique and electron probe microanalysis(EPMA). Mg3Gd and Mg3Nd form a continuous solid solution(Gd,Nd)3Mg, and a continuous solid solution(Gd,Nd)Mg is also formed between MgGd and MgNd. Mg7Gd, Mg5Gd, Mg2Gd, Mg41Nd5,(Gd,Nd)3Mg and(Gd,Nd)Mg are found in the ternary system. In these intermetallic phases, Mg7Gd has been reported to be a metastable phase in previous literatures. The solubilities of Mg, Gd and Nd in all the phases were detected. Furthermore, four three-phase equilibria, α(Mg)+Mg7Gd+ Mg41Nd5, Mg7Gd+Mg5Gd+Mg41Nd5, Mg5Gd+Mg41Nd5+(Gd,Nd)3Mg and(Gd,Nd)3Mg+(Gd,Nd)Mg+Mg2Gd, were identified in the isothermal section.采用三元扩散偶技术,利用电子探针成分分析,建立Mg-Nd-Gd三元系723 K的等温截面。Mg3Gd和Mg3Nd在三元系中形成连续固溶体(Gd,Nd)3Mg,MgGd和MgNd也形成连续固溶体(Gd,Nd)Mg。在三元系中出现的金属间化合物有Mg7Gd、Mg5Gd、Mg2Gd、Mg41Nd5、(Gd,Nd)3Mg和(Gd,Nd)Mg,其中Mg7Gd在以往的报道中认为是亚稳相。测量了Mg,、Gd和Nd在每相中的溶解度,发现在Mg-Nd-Gd三元系中存在4个三相平衡,它们分别是α(Mg)+Mg7Gd+Mg41Nd5,Mg7Gd+Mg5Gd+Mg41Nd5,Mg5Gd+Mg41Nd5+(Gd,Nd)3Mg和(Gd,Nd)3Mg+(Gd,Nd)Mg+Mg2Gd。
An isothermal section of the Mg-Nd-Gd ternary system at 723 K was established by diffusion triple technique and electron probe microanalysis (EPMA). Mg3Gd and Mg3Nd form a continuous solid solution (Gd, Nd) 3Mg, and a continuous solid solution Mg 7Gd, Mg5Gd, Mg2Gd, Mg41Nd5, (Gd, Nd) 3Mg and (Gd, Nd) Mg are found in the ternary system. In these intermetallic phases, Mg7Gd has been reported to be a metastable phase in previous literatures. The solubilities of Mg, Gd and Nd in all the phases were detected. The three three-phase equilibria, α (Mg) + Mg7Gd + Mg41Nd5, Mg7Gd + Mg5Gd + Mg41Nd5, Mg5Gd + Mg41Nd5 + By using the ternary diffusion pair technique and the electron probe composition analysis, the Mg-Nd-Gd ternary (Gd, Nd) Mg3Gd Isothermal section of 723 K. Mg3Gd and Mg3Nd form a continuous solid solution (Gd, Nd) 3Mg in the ternary system, and MgGd and MgNd also form a continuous solid solution (Gd, Nd) Mg. The intermetallic compounds in the ternary system are Mg7Gd, Mg5Gd, Mg2Gd, Mg41Nd5, (Gd, Nd) 3Mg and (Gd, Nd) Mg, of which Mg7Gd was previously reported to be a metastable phase. The solubility of Mg, Gd and Nd in each phase was measured and found that there are four three-phase equilibrium in the Mg-Nd-Gd ternary system, which are α (Mg) + Mg7Gd + Mg41Nd5, Mg7Gd + Mg5Gd + Mg41Nd5 , Mg5Gd + Mg41Nd5 + (Gd, Nd) 3Mg and (Gd, Nd) 3Mg + (Gd, Nd) Mg + Mg2Gd.