Fatigue properties of temperature gradient transient liquid phase diffusion bonded Al7075-T6 alloy
(1. Department of Engineering, Faculty of Materials Science and Engineering,
Imam Hossein University, Tehran 15816-18711, Iran;
2. Department of Materials Science and Engineering, Sharif University of Technology, Tehran 11365-9466, Iran;
3. Department of Materials, Manufacturing and Industrial Engineering, Faculty of Mechanical Engineering,
University Teknologi Malaysia, Johor 81310, Malaysia)
Imam Hossein University, Tehran 15816-18711, Iran;
2. Department of Materials Science and Engineering, Sharif University of Technology, Tehran 11365-9466, Iran;
3. Department of Materials, Manufacturing and Industrial Engineering, Faculty of Mechanical Engineering,
University Teknologi Malaysia, Johor 81310, Malaysia)
Abstract: Fatigue properties of Al7075-T6 alloy joined by temperature gradient transient liquid phase (TGTLP) diffusion bonding using liquid gallium interlayer was investigated. The fatigue specimen was jointed at 460 °C under 10 MPa pressure for 10 min. The TLP bonded samples were homogenized at 465 °C for 2 h and then T6-heat treated. The fatigue life of Al7075-T6 alloy was determined as 107 cycles under 90 MPa while the fatigue life of TLP bonded sample under this stress amplitude was 1.2×106 cycles, which is about 10% of the total Al7075 alloy fatigue life. The fatigue fracture surfaces of Al7075 sample and TGTLP bonded sample were studied using scanning electron microscope to characterize the nucleation sites and crack growth stages in both samples.
Key words: Al7075 alloy; fatigue; transient liquid phase; gallium