Through investigating the effect of parameters on the fatigue properties and crack propagation behavior of friction stir crack repaired 2024 aluminum alloy, we demonstrated that the fatigue strength of friction stir repaired Al2024 was sensitive to the repairing parameters and had a “V” type discipline with the rotating speed or advancing velocity. The fatigue crack growth rates of the repaired specimens were higher than the base material counterpart, and the crack propagation mechanism in the repaired zone was mainly intergranular. When the improper repairing parameters were adopted, the delamination defect would form at the interfaces between the repaired layer and base material

中文翻译：

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参数对摩擦搅拌裂纹修复的Al2024疲劳性能和裂纹扩展行为的影响

通过研究参数对搅拌摩擦裂纹修复的2024铝合金的疲劳性能和裂纹扩展行为的影响，我们证明了搅拌摩擦修复的Al2024的疲劳强度对修复参数敏感，并且具有“ V”型规律。旋转速度或前进速度。修复后试样的疲劳裂纹扩展速率高于母材，修复区的裂纹扩展机理主要是晶间的。当采用不合适的修复参数时，在修复层与基材之间的界面上会形成分层缺陷。