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对8 mm厚的5052/T2异种合金进行了搅拌摩擦焊,观察了接头的金相组织,测试了接头的显微硬度、抗拉强度及导电率。结果表明:5052/T2 FSW接头界面铝-铜呈迭层交替分布,部分铜镶入界面形成了“钩子”形貌。焊核区组织呈现“洋葱环”特征,出现金属塑性流线,产生了灰白色Cu-Al金属间化合物。铜侧热机影响区在搅拌针的机械和摩擦热循环的双重作用下出现条弧状组织。铝侧热影响区仅受摩擦热循环的作用,组织较粗大。焊核区硬度值有较大的波动。靠近铜侧的硬度值出现突高,可能是产生的铜-铝金属间化合物所致。接头平均抗拉强度为183 MPa,为5052母材抗拉强度的80.6%,断在铝侧热影响区。5052/T2接头焊核区域的导电率达到了5052母材的92.2%。
Friction stir welding was carried out on 8 mm thick 5052 / T2 dissimilar alloy. The microstructure of the joint was observed. The microhardness, tensile strength and electrical conductivity of the joint were tested. The results show that the interface of the 5052 / T2 FSW joint has an alternating distribution of aluminum and copper, and some copper is inserted into the interface to form a “hook” shape. The nugget organization presents “onion ring ” features, metal plastic flow lines, resulting in off-white Cu-Al intermetallic compounds. Copper side of the heat affected zone in the stirring needle mechanical and friction thermal cycling double arc appear under the organization. The heat-affected zone on the aluminum side is only affected by frictional heat cycles, with a coarse structure. Hard core hardness values have greater fluctuations. Sudden increase in hardness near the copper side may be due to the resulting Cu-Al intermetallics. The average tensile strength of the joint is 183 MPa, which is 80.6% of the tensile strength of 5052 base metal, which is broken in the heat affected zone on the aluminum side. The conductivity of the 5052 / T2 joint in the nugget area reached 92.2% of the 5052 base metal.