Effect of Solution Treatment on Microstructure and Properties of High-Purity and High-Strength Aluminum Alloy

The effect of different solution treatments and different deformation coefficients on the microstructure and mechanical properties of the high-purity and high-strength aluminum alloy was investigated by means of mechanical properties test,OM,SEM and TEM analysis.The results show that the mechanical properties of high-purity and high-strength aluminum alloy are improved when the solution treatment temperature increases as high as possible and solution time is prolonged as far as possible;the variety of .K._(Ic) of the alloy resembles the variety of .δ. of the alloy;the fracture of the alloy belongs to the transgranular/intergranular mixed mode.The properties of the alloy with deformation coefficient 12.5 are higher than those of the alloy with deformation coefficient 6.5 when the solution treatment is the same.The best parameter of solution treatment for the alloy is 485℃×400min and .σ._b,.σ._(0.2),.δ. and .K._(Ic) of the alloy are 646.7MPa,601.2MPa,12% and 36.7MPa·m~(1/2) respectively,the values of the mechanical properties of the alloy are higher than ones of similar materials in the world.