采用透射电镜、扫描电镜、三维原子探针等手段研究A1-Zr-Y合金的时效析出行为及Y含量对合金性能的影响规律.结果表明:Al-Zr-Y合金时效初期首先析出Al3Y相,可能成为A13Zr时效析出的异质核心;长时间时效后,Y有向析出相和基体界面处偏聚的倾向,最终形成无核壳结构的A13(Zr,Y)复合析出相;在三元Al-Zr-Y合金中,由于Zr的存在,Y在α(Al)中的平衡固溶度大幅度下降,600℃下的平衡固溶度从0.13％(质量分数)降至0.03％.Y含量较高的Al-0.30Zr-0.08Y在凝固及冷却过程中,过饱和的Y转变为沿晶界分布的Al3Y共晶和晶内一次析出微米级Al3Y颗粒,使铝基体中的有效Y含量较A1-0.30Zr-0.03Y中的降低4倍.Al-0.30Zr-0.03Y合金在时效过程中表现出更高的形核密度、更小的析出相尺寸和更优的抗粗化能力,合金的抗再结晶温度达到500℃,比Al-0.3Zr和A1-0.30Zr-0.08Y合金的抗再结晶温度分别高出125和75℃.
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