利用光学显微镜、扫描电镜、透射电镜和电子拉伸仪等分析和测试了2618-Ti铝合金显微组织和力学性能,确定了该合金的最佳固溶时效处理工艺,探讨了该合金的强韧化机制.结果表明,2618-Ti铝合金的最佳固溶处理工艺参数为540℃固溶处理30 min;最佳时效处理工艺参数为190℃时效处理16h.2618-Ti铝合金固溶处理后的抗拉强度明显高于同状态下的2618铝合金,但伸长率明显下降;经过时效处理后,该合金的抗拉强度和伸长率都略高于同状态的2618铝合金.2618-Ti铝合金的室温强化是时效析出相、弥散Al3Ti相和Al18Mg3Ti2相综合作用的结果;2618-Ti铝合金室温伸长率比2618铝合金的更高的原因是弥散Al3Ti相晶粒细化作用的结果.
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