王会敏,易幼平,黄始全

• 1:中南大学高性能复杂制造国家重点实验室
• 2:中南大学机电工程学院

摘要(Abstract)：

通过分级淬火方法测定了2219铝合金的时间-温度-性能(TTP)曲线。结果表明:合金TTP曲线的鼻尖温度为440℃,淬火敏感温度区间为300~480℃;等温保温时,过饱和固溶体分解析出相粒子,在440℃附近,析出相(主要为θ平衡相)的析出速率达到最高;随着时间的延长,晶内θ平衡相数量增加、尺寸变大,经时效后晶内析出相θ'不均匀分布,导致强化效果显著降低,晶内出现无沉淀析出区;鼻尖温度的高相变驱动力和较快的扩散速率是θ相析出和长大的主要原因,建议在淬火敏感区间应加快淬火冷却速率避免平衡相的析出,而高于淬火敏感区间温度时可适当降低冷却速率减小热应力的影响。

关键词(KeyWords)： 2219铝合金;TTP曲线;淬火敏感性;时效析出相

Abstract:

Keywords:

基金项目(Foundation): 国家重点基础研究发展规划资助项目(2012CB619504);; 高性能复杂制造国家重点实验室资助项目(zzyjkt2014-02)

作者(Author): 王会敏,易幼平,黄始全

DOI: 10.13289/j.issn.1009-6264.2016.08.012

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