Alloying studies of Mg-Gd system alloys are an important way to improve alloy properties, reduce Gd content, and thus cost and density. Nd is excellent in promoting aging precipitation and enhancing heat resistance properties. In this work, low Gd content Mg-7Gd-xNd-0.5Zr (x = 0, 0.5, 2, 3.5 wt%) alloys were prepared by melting casting and processed by solution aging. The effects of Nd on the microstructure and mechanical properties of the aged alloys were investigated by SEM, XRD, EDS, TEM, and electron tensile testing machine. The findings show that the Nd-free alloy consists mainly of α-Mg and Mg₅Gd, and after Nd addition, a new phase Mg₄₁Nd₅ is generated and the precipitation of the Mg₅Gd phase is promoted, and due to the heterogeneous nucleation ability of Mg₄₁Nd₅ particles leads to grain refinement. The principal precipitate phases in the matrix and grain boundaries of Nd-containing alloys are the β′ phase, which is the alloy's primary strengthening phase. Due to the influence of fine grain strengthening and precipitation strengthening, the ultimate tensile strength of the Mg-7Gd-2Nd-0.5Zr alloy achieves a maximum of 328 MPa and 294 MPa at ambient temperature and 250 °C, respectively.

Mg-Gd系合金的合金化研究是提高合金性能、降低Gd含量、进而降低成本和密度的重要途径。Nd在促进时效析出和提高耐热性能方面表现优异。在这项工作中，低 Gd 含量 Mg-7Gd- x Nd-0.5Zr ( x  = 0, 0.5, 2, 3.5 wt%) 合金通过熔铸制备并通过固溶时效处理。采用SEM、XRD、EDS、TEM和电子拉力试验机研究了Nd对时效合金显微组织和力学性能的影响。结果表明，无Nd合金主要由α-Mg和Mg ₅ Gd组成，添加Nd后，生成了新相Mg ₄₁ Nd _{5 ，Mg 5}析出Gd相得到促进，并且由于Mg ₄₁ Nd ₅颗粒的异质形核能力导致晶粒细化。含 Nd 合金基体和晶界中的主要析出相是 β' 相，它是合金的主要强化相。由于细晶强化和析出强化的影响，Mg-7Gd-2Nd-0.5Zr 合金的极限抗拉强度在常温和 250 °C 下分别达到最大值 328 MPa 和 294 MPa。