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在强制冷却条件下对2024-T4铝合金板进行搅拌摩擦加工,分析了各区(母材区、热机影响区、搅拌区)的组织形貌特征,并研究了前进速度对加工区组织性能的影响。结果表明,从母材、热机影响区到搅拌区晶粒逐渐减小,搅拌区为均匀细小的再结晶组织,平均晶粒尺寸达1.9μm;母材大部分为大角度晶界,热机影响区主要为小角度晶界,搅拌区取向差分布呈双峰模态。搅拌区硬度和抗拉强度随前进速度增大而增大。
The 2024-T4 aluminum alloy plates were subjected to friction stir processing under forced cooling condition. The microstructure and morphology of the 2024-T4 aluminum alloy plates were analyzed. The influence of the advancing speed on the microstructure and properties was also studied . The results show that the grain size decreases from the base metal, the heat affected zone to the agitation zone, the uniform and small recrystallized zone in the agitation zone, the average grain size reaches 1.9μm; the base metal is mostly large angle grain boundary, Mainly for the small angle grain boundary, stirring zone orientation difference distribution was bimodal mode. Stirring zone hardness and tensile strength increases with the increase of forward speed.