在循环水冷和空气条件下对7A04-T6铝合金进行搅拌摩擦焊接(FSW),分析强制冷却对7A04-T6铝合金FSW接头组织性能的影响.结果表明:循环水冷具有明显的瞬时快冷作用,显著抑制再结晶晶粒和析出相的长大,焊核区的平均晶粒尺寸为0.8μm,析出相尺寸为30 ～ 150nm,均小于空气条件下接头的晶粒尺寸(2.81μm)及析出相尺寸(80 ～ 400nm).与空气条件下相比,强制水冷条件明显改善接头的力学性能.焊核区的平均硬度值提高11.9HV,接头抗拉强度提高43.2MPa,达到母材抗拉强度的87.6％;接头的应变硬化能力增强,拉伸断口呈现出微孔聚合型断裂特征.
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