(北京航空材料研究院，北京 100095)
摘 要: 系统研究了不同Zr含量的超高强铝合金的时效硬化行为，发现：Zr对合金的时效硬化曲线有着明显的影响，曲线按其特征可分为3类，w(Zr)≤0.02%和0.02%<w(Zr)≤0.06%时，时效硬化效果不佳，而Zr含量在0.10%～0.16%之间的合金，时效硬化效果良好，峰值时效均在 135℃，16h左右。透射电镜分析表明，Al3Zr可使合金中的位错密度增高，抑制亚晶界的移动，在Al3Zr粒子周围发现了尺寸较大的η′相。
关键字: 超高强铝合金；时效；TEM；Zr
super-high strength aluminum alloy
（Beijing Institute of Aeronautical Materials，
Beijing 100095，China）
Abstract:The age-hardening behavior of super-high strength aluminum alloys with different zirconium contents was investigated. It is found that the influence of Zr on ageing is remarkable. The curves of age-hardening can be identified into three types according to their characteristics. When the Zr content is less than 0.06%, ageing treatment produces unexpected effect on the hardness. But when the content of Zr is between 0.10% and 0.16%，it can achieve good results through ageing and the ageing peaks almost all locate at 135℃，16h. The results of TEM observation show that the Al3Zr particles can keep a relative high level density of dislocation and retard the movement of the subgrains. It is also found that the larger and more η′phase can be observed around the Al3Zr particles.
Key words: super-high strength aluminum alloy; ageing; TEM; Zr
