Effect of solution treatment on microstructure and mechanical properties of high purity Al-Cu-Mg alloy

The effect of solution treatment on the microstructure and mechanical properties of as-rolled sheet of high-purity Al-Cu-Mg aluminum alloy were studied by optical microscope( OM),scanning electron microscopy( SEM),DSC,room temperature tensile test and hardness test. The results show that with solid solution temperature and holding time increasing,the amount of residual particles in the matrix decreases,while ultimate tensile strength( σb),yield strength( σ0. 2) and elongation( δ) increase. The σb,σ0. 2and δ of samples with solid solution at 505℃ for 1 h are 466 N / mm2,298 N/mm2 and 21. 1%,respectively. The peak hardness( 136 HV) is observed when solid solution of the alloy is conducted at 500℃for 20 min.