Fatigue crack initiation behaviors throughout friction stir welded joints in AA7075-T6 in ultrasonic fatigue

Abstract : This paper presents the results of experimental investigation on fatigue behaviors of friction stir welded joints in AA7075-T6 with ultrasonic fatigue test system (20 kHz). Two kinds of particles, Fe-rich inter-metallic compounds and Mg2Si-based particles, governed the fatigue crack initiation. The plastic defor-mation and recrystallization during welding process led to the changes in particle size and micro crack occurrence between thermo-mechanically affected zone (TMAZ) and nugget zone (NZ). Therefore, the fatigue crack initiation sites leaned to be located at the TMAZ in short fatigue life, or at the NZ in very high cycle fatigue regime.
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Chao He, Yongjie Liu, Jiangfeng Dong, Qingyuan Wang, Danièle Wagner, et al.. Fatigue crack initiation behaviors throughout friction stir welded joints in AA7075-T6 in ultrasonic fatigue. International Journal of Fatigue, Elsevier, 2015, 81, pp.171 - 178. ⟨10.1016/j.ijfatigue.2015.07.012⟩. ⟨hal-01687076⟩

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