Abstract The structure, composition range and phase equilibrium of the ternary compound T1 with low Nd content in the Mg-Zn-Nd alloys have been investigated by scanning electron microscopy, electron probe microanalysis, X-ray diffraction and electron diffraction. It has been shown that the ternary compound T1 with the hcp structure, whose structure parameters are a=b=1.5nm, c=0.87nm, exists in the Mg-Zn-Nd alloys with low Nd content. The composition range of the T1 phase is 27.0~33.4at%Mg, 60.0~66.4at%Zn and 6.1~7.4at%Nd. At the temperature range of 300~400℃, there exists (Mg)+T1 two-phase field; and the Zn content in the (Mg) which is in two- phase equilibrium with T1 increases with the temperature. Three-phase field T1+(Mg)+MgZn exists at 300℃, T1+MgZn+L exists at 350℃, and T1+Mg2Zn3+L exists at 400℃ in the Mg-Zn-Nd system.
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