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The S–N curves at very high cycle fatigue (VHCF) regime for the base material and the friction stir welding (FSW) joint of 7050 aluminum alloy present multi-stage shapes with an inflection point at about 108 cycles in the study. In the regime between 1×106 and 5×107, the fatigue crack initiates at the thermo-mechanically affected zone (TMAZ) on the advancing side; during the life between 5×107 and...
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