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研究了 Al-Mg-Si 系合金6063在不同时效状态下的显微组织及循环形变特性,并结合其疲劳性能和断裂特征进行了讨论。结果表明,时效条件对显微组织和形变机制有明显的影响。在UA 和 PA 状态下,组织中的时效析出物为 GP 区,形变以位错切过的方式进行,形成不均匀的平面滑移带。在 OA 状态,组织中的时效析出物为β′相,位错绕过β′相,形成均匀的位错缠结。形变特性对合金的疲劳断裂形式有明显的影响。
The microstructure and cyclic deformation properties of Al-Mg-Si alloy 6063 under different aging conditions were studied. The fatigue properties and fracture characteristics were also discussed. The results show that the aging conditions have a significant effect on the microstructure and deformation mechanism. Under UA and PA conditions, the aging precipitates in the tissues are in the GP zone, and deformation takes place in a dislocated manner to form an inhomogeneous plane slip zone. In the OA state, the aging precipitates in the tissue are the β ’phase and the dislocations bypass the β’ phase, forming uniform dislocations. Deformation characteristics of the alloy fatigue fracture have a significant impact.