采用透射电镜组织观察、DSC分析和硬度测试,研究了室温水、沸水和空气3种淬火冷却介质对Al-9.0Zn-2.5Mg-2.0Cu-0.15Zr-0.2Sc铝合金硬度和微观组织的影响.结果表明,采用室温水冷淬火T6时效后合金硬度最高、晶内细小弥散析出相最多、粗大平衡相最少,晶界无析出带(PFZ)基最窄;采用空冷淬火,T6时效后合金硬度最低、晶内析出的粗大平衡相最多,其周围约有50 nm宽的PFZ,合金的晶界PFZ最宽.Sc对合金淬火敏感性的影响取决于其抑制合金再结晶程度与Al3(Sc,Zr)粒子的分布.
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