Influence of heat treatment on intergranular corrosion and mechanical property of 5083 aluminum alloy

The microstructure, intergranular corrosion phenomenon and mechanical property were investigated by means of metallographical microscope, SEM, hardness tester, mechanical property testing machine. The result showed, discontinuous phase precipitated after stabilization heat treatmenting, and the phase was scarcity, there was no intergranular corrosion phenomenon when the samples cold rolled and stabilization heat treatmented. Equiaxed grains appeared after annealing, continuous phase precipitated at the grain boundaries, the intergranular corrosion was happened, but the intergranular corrosion was more obviously annealed for 90 h than for 15 h; the hardness of 5083 aluminum alloy reached highest when it was stabilization heat treatmented, it was lowest when cold rolled, the hardness of the samples annealed was lower than stabilization heat treatmented, but higher than cold rolled. The alloy's plasticity after stabilization heat treatmenting or annealing was better than after cold rolling.