Effect of solution treatment on microstructure and properties of spray formed 7055 aluminum alloy
Effect of solution treatment on microstructure and properties of spray formed 7055 aluminum alloy was studied using differential scanning calorimetry(DSC),scanning electron microscopy(SEM),electron backscatter diffraction(EBSD)technique,room temperature tensile testing and exfoliation corrosion testing.The results show that as the solution temperature increase,the area fraction of the coarse second phases in the alloy gradually decreases,and the AlZnMgCu and Al2CuMg(S)phases basically dissolve into the matrix,leaving only a small amount of Al7Cu2Fe phase.The subgrain size and recrystallization area fraction increase with the increase of solution temperature and the increase of solution time,leading to an increase in tensile strength first and then a decrease.After solution treatment at 470℃for 2 h and aging treatment,the tensile strength,elongation,and exfoliation corrosion resistance of the alloy are 613.4 MPa,8.9％,and EB+grade,respectively.The static recrystallization mechanism of the spray formed 7055 aluminum alloy includes the"original grain boundary bowing out mechanism"and the"subgrain merging mechanism".
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