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材料工程  2010 

1973铝合金铸态组织及均匀化退火组织研究

, PP. 56-63

Keywords: Al-Zn-Mg-Cu合金,均匀化,显微组织

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Abstract:

采用光学金相显微镜、扫描电镜、X射线、DSC等分析手段研究了1973高强铝合金铸态和均匀化态的显微组织和成分分布。结果表明合金铸态组织为枝晶结构,主要存在α-Al,MgZn2(η相)和Al2CuMg(S相),还存在少量的Al13(FeCu)4相。其中MgZn2相中固溶部分Al原子和Cu原子,Al2CuMg相中固溶分布Zn原子。该合金合适的均匀化处理工艺为470℃/24h。均匀化后,原铸态合金中的MgZn2(η相)和Al2CuMg(S相)回溶到基体,仅残留少量Al13(FeCu)4相和Al7Cu2Fe相,晶内析出大量弥散分布的球形Al3Zr粒子。

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