对铸态L2纯铝进行搅拌摩擦加工(FSP)处理,研究L2纯铝加工前后的显微组织,力学性能及微观断裂机理.结果表明,剧烈的塑性变形促使粗大的枝状晶显著破碎,形成细小且均匀分布的再结晶组织.搅拌摩擦加工后,L2纯铝的显微硬度提高9HV,抗拉强度和延伸率分别提高34 MPa和17%;试样的拉伸断口呈现出微孔聚合韧性断裂特征.细晶强化对材料力学性能的提高起主要作用.
Friction stir processing was applied to cast pure aluminum L2. The microstructure, mechanical properties and micro-fracture mechanism were studied before and after processing. The results show that intense plastic deformation results in significant breakup of the coarse dendrites and creates a fine, uniform recrystallized microstructure. The microhardness, tensile strength and elongation increase by 9HV,34 MPa and 17% after FSP, respectively;the surface fracture of the FSPed tensile specimen exhibits a typical ductile dimple-fracture. Grain refinement strengthening plays an important role in enhancing the mechanical properties.
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