戴晓元,李妮,熊亮,石志豪

• 1:长沙理工大学汽车与机械工程学院

摘要(Abstract)：

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。

关键词(KeyWords)： 淬火敏感性;TEM组织;DSC;Al-Zn-Mg-Cu-Zr铝合金;Sc

Abstract:

Keywords:

基金项目(Foundation): 湖南省自然科学基金(12JJ2023)

作者(Author): 戴晓元,李妮,熊亮,石志豪

DOI: 10.13289/j.issn.1009-6264.2014.12.012

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