Fatigue Property and Fracture Mechanism of 5754 Aluminum Alloy GTAW and FSW Joints

QIAO Yaxia; ZHAO Lei; XU Lianyong; ZHANG Hao; ZHANG Pengfei; HAN Yongdian

doi:10.11973/jxgccl201910007

Materials and Mechanical Engineering > 2019 > 43(10): 30-34,40. > DOI: 10.11973/jxgccl201910007

QIAO Yaxia, ZHAO Lei, XU Lianyong, ZHANG Hao, ZHANG Pengfei, HAN Yongdian. Fatigue Property and Fracture Mechanism of 5754 Aluminum Alloy GTAW and FSW Joints[J]. Materials and Mechanical Engineering, 2019, 43(10): 30-34,40. DOI: 10.11973/jxgccl201910007

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Fatigue Property and Fracture Mechanism of 5754 Aluminum Alloy GTAW and FSW Joints

1. China Electric Power Research Institute, Beijing 100192, China;
2. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China

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Received Date: August 07, 2018
Revised Date: August 12, 2019

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Abstract

Abstract

5754 aluminum alloy with thickness of 10 mm was welded by gas tungsten arc welding (GTAW) and friction stir welding (FSW) using a double-sided synchronization welding method. The fatigue property of welded joints at stress amplitudes of 162, 135, 117, 108,99 MPa was compared and studied, and fracture mechanism was analyzed. The results show that the fatigue strength of GTAW joint at given stress amplitudes was obviously larger than that of FSW joint. The fatigue strength eigenvalues at 50% and 95% survival percent of GTAW joint increased by 26.3% and 24.4%, respectively, compared with those of FSW joint, indicating that the fatigue property of GTAW joint was better than that of FSW joint. The fatigue failure mechanism of GTAW and FSW joints was almost the same. The fatigue cracks all initiated at the outer surface of fusion zone of joints. With the decrease of stress amplitude, the proportion of the fatigue crack propagation zone increased. At the same stress amplitude, the proportion of crack propagation zone of GTAW joint was larger than that of FSW joint. The spacing of fatigue striations in GTAW joint was narrower, indicating that the fatigue life of GTAW joint was larger than that of FSW joint.
- 5754 aluminum alloy,
- welded joint,
- fatigue property,
- fracture mechanism

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