Effect of Sc on Microstructure and Properties of 6061 Alloy
The microstructure and properties of 6061 aluminum alloy were modified by adding Sc.6061 and 6061-0.2Sc ingots were prepared by vacuum induction melting and homogenized and annealed at 550℃ ×12 h,followed by hot extrusion deformation and solution aging heat treatment of 570℃ ×1 h water quenching +175℃ ×5 h air cooling.The microstructure and properties of Sc microalloyed aluminum alloy sheet before and after extrusion were invstigated.The results indicate that Sc has grain refinement effect,and the grain size of 6061-0.2Sc is 20～50 μm after homogeni-zation.The grain size of 6061-0.2Sc after extrusion and solution aging heat treatment is finer and more uniform than that of 6061 alloy.After Sc addition,the tensile strength and elongation of the alloy are improved,and the macro frac-ture is smooth,and the tensile fracture mode is converted from tough-brittle mixed fracture to ductile fracture.Mean-while,the corrosion current density is decreased from 946.62 μA/cm2 to 568.05 μA/cm2,indicating the significant enhancment of corrosion resistance.
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维普
