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材料工程  2015 

新型Al-Zn-Mg-Cu铝合金热稳定性研究

DOI: 10.11868/j.issn.1001-4381.2015.04.003, PP. 13-18

Keywords: 7D04铝合金,热稳定性,微观组织,力学性能

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Abstract:

采用常温拉伸力学性能测试和透射电镜(TEM)观察,研究新型Al-Zn-Mg-Cu铝合金7D04的热稳定性。结果表明7D04-T7451合金的组织和性能在不高于125℃时可长时间保持稳定;当温度高于150℃时,板材的强度随着稳定化处理时间的延长持续下降;稳定化处理温度越高强度下降的幅度越大。稳定化温度175℃处理500h后,屈服强度和抗拉强度仅为286MPa和385MPa,与未稳定化处理相比分别降低38%和26%。7D04-T7451铝合金在稳定化处理过程中强度下降的内在原因是由于η'和η相的粗化。

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