Single-stage Solution Process of Spray Deposited 7055 Aluminum Alloy Based on EBSD
Effects of single-stage solution temperature on the second phase,grain size and recrystallization fraction of spray deposited 7055 aluminum alloy were quantitatively investigated by scanning electron microscopy(SEM)and electron backscatter diffraction(EBSD).The results indicate that the second phase area is 10.3%,the average grain size is 2.5 μm,and the recrystallization fraction accounts for 57.5%in as-extruded alloy.With the increase of solution temperature,the second phase is gradually dissolved back into the matrix with decreasing proportion,and the average grain size and recrystallization fraction are gradually increased.After solution treatment at 460℃×2 h,the second phase area is 0.73%,the average grain size is 3.2 μm,and the recrystallization fraction is 76.8%.After solution treat-ment at 470℃×2 h,the second phase area is 0.57%,the average grain size is 3.8 μm,and the recrystallization frac-tion is 78.9%.After solution treatment at 480℃×2 h,the second phase area is 0.52%,the average grain size is 4.4 μm,and the recrystallization fraction is 80.4%.When the solution treatment process is 470℃×2 h,the proportion of residual second phase area and recrystallization fraction in the alloy are low with fine grain,which is the optimal solu-tion treatment process.
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