对2198和C24S异种铝锂合金进行搅拌摩擦焊对接试验,分析接头的显微组织和力学性能.结果表明:前进侧和返回侧热影响区的板条状组织均发生了粗化,前进侧热力影响区的晶粒被拉长,返回侧热力影响区的变形晶粒周围存在细小的再结晶晶粒,焊核区为细小的2198和C24S铝锂合金再结晶晶粒,且2198铝锂合金的再结晶晶粒更大.焊接速度在60～120 mm/min变化时,2198铝锂合金位于前进侧的接头抗拉强度更高;接头拉伸试样的断裂均发生在2198铝锂合金的热力影响区,最大抗拉强度为382MPa,达到了2198铝锂合金母材抗拉强度的82.7％;接头的焊核区、热力影响区和热影响区均发生软化,焊核区中2198铝锂合金的硬度比C24S铝锂合金的更低.
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