Research of microstructure and characteristics of aging treatment of Cu-20Ni-5Sn alloy

Study the effect of aging treatment on tensile strength, elongation and electrical conductivity of Cu-20Ni-5Sn alloy. Investigate the relationship between the second phases and microstructure of alloy which has good integrative feature. The results show that cold deformation is useful to obtain double strengthening effect of deformation and aging. The strength rises with the increase of aging temperature because the action of modulation resolution. The holding time which alloy achieves peak strength shortens with the increase of aging temperature. The electrical conductivity rises greatly with the increase of holding time when it is less than 2h, and enhances slightly when it is more than 2h. Aging treatment at 375°C×8h, alloy has good integrative feature, the tensile strength, elongation and electrical conductivity are 927MPa, 10%, 6.4IACS%respectively.