利用光学显微镜(OM)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、能谱分析(EDS)、差示扫描量热(DSC)、X射线物相分析(XRD)研究了7449高纯高强韧铝合金均匀化热处理制度及其微观组织演变.结果表明:7449合金铸锭组织存在枝晶偏析,Zn,Cu原子沿晶界偏析严重,非平衡共晶相沿晶界呈连续网状分布,共晶相组成为α(Al)+ Mg( AlZnCu)2四元相,初始回溶温度为477℃；合金经不同均匀化热处理后,非平衡共晶相发生回溶,且析出弥散分布的A13Zr粒子.研究了不同的均匀化热处理制度对7449合金微观组织的影响,均匀化热处理温度越高,合金非平衡共晶相回溶效果越好,合金经(440℃/12 h)+(470℃/24 h)均匀化热处理后第二相回溶充分,且析出弥散的Al3Zr粒子,抑制后续加工和固溶处理过程中的再结晶.最终确定合金合理的均匀化热处理制度为(440 ℃/12 h)+(470 ℃/24 h).
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