利用光学显微镜、扫描电镜、能谱分析、X射线衍射分析和差示扫描量热分析等研究了Al-7.5Zn-1.6Mg-1.4Cu合金铸态与均匀化态的显微组织演化与元素分布,确定了该合金的均匀化温度与过烧温度.结果表明,合金铸态组织中存在严重的枝晶偏析,经470℃保温24 h后,枝晶网络变稀,共晶相与η相回溶至基体,偏析基本消除.470℃保温24 h是该合金较为理想的均匀化工艺.
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