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通过金相显微镜(OM)、拉伸力学性能测试、扫描电镜(SEM)、能谱分析(EDS)等手段,研究了稀土元素Ce、La对Al-8.5Mg-0.5Mn合金铸态组织及力学性能的影响。Ce、La能够细化高镁铝合金的组织,其铸态显微组织由发达的树枝晶变成不明显的树枝晶,又演变成晶胞状。添加Ce的试验合金中有少量粗大骨骼状的Al4Ce相存在,而添加La的合金中未发现粗大的Al-La相。添加稀土Ce或La可使高镁铝合金的强度得到不同程度的提升,且随着Ce或La含量的提高,合金的抗拉强度变化趋势一致,均会出现2个峰值:当Ce或La添加量约为0.25%时,合金的抗拉强度为180~190 MPa;当Ce或La添加量为1.5%时,合金抗拉强度为220~230 MPa。添加稀土La后合金的伸长率高于加稀土Ce的。
The microstructure and mechanical properties of Al-8.5Mg-0.5Mn alloy cast by Ce and La were investigated by OM, Tensile Mechanical Properties Test, Scanning Electron Microscope (SEM) and Energy Spectrum Analysis (EDS) The impact of performance. Ce and La can refine the microstructure of high-magnesium aluminum alloy. The as-cast microstructure changes from developed dendrites to indistinct dendrites and evolves into unit cells. A small amount of coarse, skeletal Al4Ce phase exists in the test alloy to which Ce is added, whereas no coarse Al-La phase is found in the La-added alloy. The addition of rare earth Ce or La can improve the strength of high-magnesium aluminum alloy to some extent. With the increase of Ce or La content, the tensile strength of the alloy shows the same trend, and there are two peaks. When Ce or La is added The tensile strength of the alloy is 180 ~ 190 MPa when the amount is about 0.25% and 220 ~ 230 MPa when the Ce or La addition is 1.5%. After adding rare earth La alloy elongation higher than the addition of rare earth Ce.