采用电子束焊(EBW)对2024铝合金进行焊接,研究了接头的显微组织和力学性能.结果表明:接头焊缝显微组织呈细小的等轴晶,主要由α-Al基体相及其上分布着的θ(CuAl2)和S(Al2CuMg)强化相组成,热影响区为粗大的枝晶;接头的抗拉强度达到母材的80%左右,热影响区是强度最薄弱的部位;焊缝的硬度低于母材和热影响区的,且热影响区存在一定的软化现象;其拉伸断口呈典型的韧窝状断口,韧窝尺寸较小且均匀.
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