The microstructures and tensile properties were investigated for high-pressure die-cast Mg1.6La1.0Ce alloy with different Nd contents from 0 to 3 wt.%. The results showed that fine dendritic and segmented dendritic microstructures were observed in the as-cast alloys, but the eutectic morphology changed from lamellar for low Nd-containing alloys to continuous fibrous with dendritic α-Mg in eutectics for high Nd-containing alloys. The compositions of the eutectic phase were also transferred from Mg₁₂(La, Ce) in the alloys without Nd to Mg₁₂(La, Ce, Nd) in the alloys with Nd addition. When the concentration of Nd was greater than 2 wt.%, numerous nanoscale Mg-Nd intermetallic phases precipitated at the grain boundaries and eutectic area. The addition of Nd was also found to increase tensile strength significantly at ambient temperature and elevated temperatures. For the alloy without Nd, the yield strength and ultimate tensile strength (UTS) was 135.6 MPa and 189.9 MPa at ambient temperature and 56.3 MPa and 57.4 MPa at 300 °C, respectively. When adding 3 wt.% Nd, the yield strength increased to 161.9 MPa at ambient temperature and 75.4 MPa at 300 °C. The UTS increased to 181.9 MPa at ambient temperature and 90.4 MPa at 300 °C. The significant improvement in strength was attributed to the strengthening from the refined structure and the dispersion of second-phases of intermetallic compounds.

研究了 Nd 含量从 0 到 3 wt.% 的高压压铸 Mg1.6La1.0Ce 合金的显微组织和拉伸性能。结果表明，在铸态合金中观察到精细的枝晶和分段枝晶显微组织，但共晶形态从低含Nd合金的层状转变为高含Nd合金共晶中的连续纤维状枝晶α-Mg。共晶相的组成也从不含 Nd 的合金中的Mg _{12 (La, Ce) 转移到 Mg 12}(La, Ce, Nd) 在添加 Nd 的合金中。当 Nd 的浓度大于 2 wt.% 时，大量纳米级 Mg-Nd 金属间相在晶界和共晶区析出。还发现添加 Nd 可显着提高环境温度和高温下的拉伸强度。对于不含 Nd 的合金，屈服强度和极限抗拉强度 (UTS) 在环境温度下分别为 135.6 MPa 和 189.9 MPa，在 300 °C 下分别为 56.3 MPa 和 57.4 MPa。添加 3 wt.% Nd 时，屈服强度在环境温度下增加到 161.9 MPa，在 300 ℃下增加到 75.4 MPa。UTS 在环境温度下增加到 181.9 MPa，在 300 °C 下增加到 90.4 MPa。