(北京航空材料研究院，北京 100095)
摘 要: 系統(tǒng)研究了不同Zr含量的超高強(qiáng)鋁合金的時效硬化行為，發(fā)現(xiàn)：Zr對合金的時效硬化曲線有著明顯的影響，曲線按其特征可分為3類，w(Zr)≤0.02%和0.02%<w(Zr)≤0.06%時，時效硬化效果不佳，而Zr含量在0.10%～0.16%之間的合金，時效硬化效果良好，峰值時效均在 135℃，16h左右。透射電鏡分析表明，Al3Zr可使合金中的位錯密度增高，抑制亞晶界的移動，在Al3Zr粒子周圍發(fā)現(xiàn)了尺寸較大的η′相。
關(guān)鍵字: 超高強(qiáng)鋁合金；時效；TEM；Zr
super-high strength aluminum alloy
DAI Sheng-long, YAN Ming-gao
（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
