【摘要】 通过拉伸和电镜观察等方法研究了时效处理对快速凝固的 Al-2.4Li-2.4Cu,Al-2.4Li-2.4Cu-0.3Zr 和 Al-2.4Li-2.4Cu-0.7Zr 三种合金结构与性能的影响。实验结果表明,加入 Zr元素和进行预变形可明显地提高 Al-Li-Cu 合金的时效速度并提高合金的强度。但 Zr 含量超过0.3wt-%以后并不产生明显的强化效果。预变形产生的位错对 T1 强化相的均匀析出十分有利。更多还原

【Abstract】 The effect of aging on the structure and properties of rapidly solidifiedAl-2.4Li-2.4Cu,Al-2.4Li-2.4Cu-0.3Zr and Al-2.4Li-2.4Cu-0.7Zr alloys has been studied byusing tension and TEM.The experimental results show that aging velocity and tensile strengthof alloys were increased by adding Zr and pre-age stretching.However,adding of Zr exceeds0.3 wt% does not produce strong strengthening effect on the alloys.The dislocation producedby pre-age stretch is avialible for uniform precipitation of Tl strengthening phase.更多还原