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采用搅拌针置中(M4A4)、向镁合金侧偏置2 mm(M6A2)和向铝合金侧偏置2 mm(A6M2)3种焊接方式,研究了6 mm厚6061-T651铝合金和AZ31镁合金轧制板材的搅拌摩擦焊接.SEM及XRD分析表明,3种焊接方式均在焊接界面处发现Mg_(17)Al_(12)相的生成和由于共晶相熔化和随后冷却所形成的孔洞.在M4A4和M6A2样品中,少量的Al搅入到镁合金侧形成金属间化合物Mg_(17)Al_(12),而在A6M2样品中,少量的Mg搅入到铝合金中也形成金属间化合物Mg_(17)Al_(12),在Mg_(17)Al_(12)与基体的界面处存在微小孔洞.由于焊核区仅有少量的Mg_(17)Al_(12)生成,其硬度变化并不显著.焊接界面处生成的金属间化合物及孔洞显著降低接头的拉伸性能.
Three kinds of welding methods, including M4A4, 2 mm (M6A2) offset to the magnesium alloy side and 2 mm (A6M2) offset to the aluminum alloy side were studied. The effects of 6 mm thick 6061-T651 aluminum alloy and AZ31 magnesium The results of SEM and XRD show that all the three kinds of welding methods found the formation of Mg 17 Al 12 phase and the holes formed by the eutectic melting and subsequent cooling at the welding interface. In M4A4 and M6A2 samples, a small amount of Al was stirred into the magnesium alloy to form intermetallic compound Mg 17 Al 12, while in A 6 M 2 sample a small amount of Mg was stirred into the aluminum alloy to form intermetallic compound Mg (17) Al_ (12), there are tiny holes in the interface between Mg_ (17) Al_ (12) and the matrix.The hardness change is not significant because only a small amount of Mg_ (17) Al_ Intermetallics and voids generated at the weld interface significantly reduce the tensile properties of the joint.