采用水下搅拌摩擦焊接技术(SFSW)对2024-T4铝合金板材进行连接,研究焊接速度对SFSW接头焊核区析出相形貌和显微硬度的影响.结果表明,循环水冷介质具有明显的瞬时快冷作用.SFSW接头焊核区S-Al2CuMg相在焊接热循环的作用下发生析出长大.随着焊接速度的增加,析出相的数量先增多后减少,尺寸先减小后增大.沉淀强化和细晶强化作用促使焊核区硬度随焊接速度的增加而增大.
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