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惯性摩擦焊是一种连接异种金属理想的焊接方法,对铝合金/不锈钢采用惯性摩擦焊进行焊接,并详细研究了焊接接头的形貌、组织、界面成分和力学性能.结果表明,在惯性摩擦焊接头的界面处形成了很薄的金属间化合物(IMC)反应层,该反应层主要由Al、Fe 元素组成,是富集Si 元素的FeAl3相.惯性摩擦焊接头组织由焊核区、完全动态再结晶区、热机械影响区和热影响区组成.完全动态再结晶区的晶粒尺寸小于0.1 μm,它的平均宽度为5 μm.接头的显微硬度(HV)最大值出现在不锈钢侧的完全动态再结晶区,其值为3958 MPa.惯性摩擦焊中,初始转速对接头的拉伸性能有显著影响.当初始转速为1200 r/min 时,铝/钢惯性摩擦焊接头的最大抗拉强度为323 MPa,达到铝合金母材强度的92％.“,”Inertia friction welding(IFW)method is a potentially ideal technique to weld dissimilar materials.Aluminum and stainless steel were welded by inertia friction,and the morphology,microstructure,interfacial composition and mechanical properties of Al/steel joints were investigated.Results show that a thin intermetallic compound(IMC)reaction layer is found at the welding interface in the joint,and the IMC consists of Al,Fe and high concentration of Si.The microstructure of joint contains weld nugget zone,fully dynamic recrystallized zone(FDRZ),thermal mechanically affected zone and heat affected zone.The grain size of FDRZ is below 0.1 μm,and the average width of FDRZ in the joint is about 5 μm.The part with maximum hardness(HV)lies in FDRZ,and the maximum value is 3958 MPa in the joint.The tensile strength of joint is influenced by the rotational speed.When the rotational speed is 1100 r/min,the joint reaches to the maximum tensile strength of 323 MPa,which is related to the thickness of IMC at the weld interface.