Acta Metallurgica Sinica (English Letters) ›› 2016, Vol. 29 ›› Issue (12): 1161-1168.DOI: 10.1007/s40195-016-0510-2

Special Issue: Friction Stir Welding In AMSE 2015-2017 2016-2017铝合金专辑

• Orginal Article • Previous Articles     Next Articles

Fatigue Behavior of Dissimilar Al-Mg-Si/Al-Zn-Mg Aluminum Alloys Friction Stir Welding Joints

Zhong-Jie Yan1,Xue-Song Liu1(),Hong-Yuan Fang1   

  1. 1. State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology, Harbin 150001, China
  • Received:2016-09-14 Online:2016-11-22 Published:2016-11-22

Abstract:

In this study, fatigue properties and fracture mechanism of dissimilar Al-Mg-Si/Al-Zn-Mg aluminum alloys friction stir welding (FSW) joints were investigated and the effect of the sheet configuration on the fatigue behavior of the FSW joints was also discussed. Results showed that the joints owned better fatigue properties when the Al-Zn-Mg aluminum alloy was placed at the advancing side (AS). At 107 cycles, the fatigue strengths of Al-Zn-Mg-AS and Al-Mg-Si-AS joints were, respectively, 105.6 and 90.1 MPa. All joints fractured at the heat-affected zone at the Al-Mg-Si alloy side. Transmission electron microscopy results showed that better fatigue property of the Al-Zn-Mg-AS joint was associated with the bridging effect of the bigger secondary phase particles.

Key words: Fatigue behavior, Friction stir welding, Al-Mg-Si/Al-Zn-Mg aluminum alloys, Secondary phase particle