The effect of annealing temperature on the microstructure and mechanical properties of 5A02 aluminum alloy
This article investigates the effect of annealing temperature on the microstructure and mechanical properties of 5A02 aluminum alloy tubes. Scanning electron microscopy (SEM),energy dispersive spectroscopy ( EDS),and electron backscatter diffraction (EBSD) were used to analyze the microstructure of samples annealed at 300-500 ℃ for 1 hour,including the distribution and composition of the second phase,as well as the morphology and size of the grains. The tube samples annealed at different temperatures were subjected to room-temperature tensile tests. The results show that among all annealed samples,the sample annealed at 300 ℃ has the highest strength,with yield strength and tensile strength of 133. 4 MPa and 195. 7 MPa,respectively. At this stage,the microstructure of sample is in the transition phase from fibrous texture to recrystallized texture. As the annealing temperature of the sample increases,the recrystallized grains grow,the dislocation density decreases,and the strength decreases. When the annealing temperature rises to 500 ℃,the yield strength and tensile strength of the tube sample decrease to 99. 2 MPa and 175. 8 MPa,respectively.
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