超高强Al-9.0Zn-2.7Mg-1.8Cu-0.12Zr合金均匀化工艺Homogenization process of ultra-high strength Al-9.0Zn-2.7Mg-1.8Cu-0.12Zr alloy
曾渝
摘要(Abstract):
采用硬度和电导率测试、差热分析、金相观察和电子显微分析方法,研究了均匀化过程中超高强Al-Zn-Mg-Cu-Zr合金硬度、电导率和显微组织的演变规律。结果表明:铸态合金主要由过饱和固溶体α(Al)及非平衡共晶组织组成。在300~490℃均匀化过程中,其显微组织发生了如下变化:一方面,η相和Al3Zr相的析出行为随着均匀化温度的改变而呈现出规律性的变化;另一方面,随着均匀化温度的升高,铸态合金的枝晶组织和枝晶间粗大的非平衡相逐步消失,其硬度先降低后升高,电导率先升高后降低,这种性能变化与组织结构变化一一对应。合金铸锭适宜的均匀化工艺为450℃保温24 h,均匀化过程动力学分析结果与实验结果基本吻合。
关键词(KeyWords): 均匀化处理;Al-Zn-Mg-Cu-Zr合金;组织;性能
基金项目(Foundation): 汽车用钢国家重点实验室自主项目
作者(Author): 曾渝
DOI: 10.13289/j.issn.1009-6264.2016.11.011
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