以Al-11%Y中间合金的形式向Al-1%Mn合金基体中添加稀土元素钇，制备了钇质量分数分别为0%，0.07%，0.21%，0.31%，0.38%的Al-1%Mn合金铸锭，然后依次进行固溶、热轧和冷轧处理，研究了稀土钇含量对合金铸态、热轧态和冷轧态显微组织、冷轧态的拉伸性能以及铸态硬度的影响。结果表明：稀土钇是Al-1%Mn合金的一种有效的变质剂，添加一定含量的稀土钇能有效地使粗大的初生α-Al枝晶变成圆整和细小的等轴晶;当钇的质量分数为0.31%时，晶粒的细化效果最好，铸态组织中α-Al晶粒的尺寸从163.5 μm减小至38.2 μm，冷轧态合金的抗拉强度、伸长率和铸态合金的硬度分别从未添加钇的267.62 MPa，8.2%，36.8 HV增至313.13 MPa，14.8%，39.42 HV。

The rare earth element (yttrium) with mass fraction of 0%, 0.07%, 0.21%, 0.31%, 0.38% in the form of Al-11%Y intermediate alloy was respectively introduced into the Al-1%Mn aluminum alloy, then the prepared alloy ingot was treated in the order of solid solution, hot rolling and cold rolling. The effects of yttrium contents on the microstructures of as-cast, hot rolled and cold rolled alloys, the tensile properties of cold rolled alloy and the hardness of as-cast alloy were studied. The results show that yttrium is an excellent modifier for Al-1%Mn alloy and the primary α-Al phases were refined from coarse dendrite to fine equiaxed grain after adding a certain content of yttrium. When the added yttrium content was about 0.31%, the grain refining effect was the most significant; the grain size of α-Al was reduced from 163.5 μm to 38.2 μm. Meanwhile, the tensile strength and elongation of the cold rolled alloy and the micro-hardness of the casting Al-1%Mn alloy with 0.31% yttrium increased from 267.62 MPa, 8.2% and 36.8 HV to 313.13 MPa, 14.8% and 39.42 HV respectively.