采用激光沉积修复技术修复预制槽损伤拉伸试样,通过光学显微镜和扫描电子显微镜对修复试件的显微组织、拉伸断口及断口附近变形组织进行分析观察。结果表明,修复区组织由Al枝晶和枝晶间Al-Si共晶组成,Si相呈珊瑚状形貌;修复占比为10%和20%的试件的室温抗拉强度分别达到了铸件标准的90%和88%,断后伸长率均优于铸件标准;基材区断裂机制为脆性断裂,而修复区为韧性断裂;基材区微裂纹断裂方式为穿晶断裂,而修复区为沿晶断裂。 The laser deposition repair technique was used to repair pre-groove damage tensile specimens. The microstructure, tensile fracture and deformation of the repaired specimens were analyzed by optical microscope and scanning electron microscope. The results show that the repair zone consists of Al-Si eutectic between Al dendrite and dendrites, and the Si phase is coral-like. The tensile strength at room temperature of the specimens with the proportion of 10% and 20% is up to the casting standard 90% and 88% respectively. The elongation at break was better than that of castings. The fracture mechanism of the substrate zone was brittle fracture and the repair zone was ductile fracture. The fracture mode of microcracks in the substrate zone was transgranular fracture, Crystal breaks.