Effects of Ag on High-Temperature Creep Behaviors of Peak-Aged Al-5Cu-0.8Mg-0.15Zr-0.2Sc(-0.5Ag)

The tensile creep of Al-5Cu-0.8Mg-0.15Zr-0.2Sc(-0.5Ag) was tested at 150–250 °C and 125–350 MPa, the effect Ag on high-temperature Al-Cu-Mg alloys discussed. After addition Ag, performances alloy were significantly improved 150 °C/300 MPa 200 °C/(150 175 MPa). Then, constitutive relational models during built, activation energy calculated to be 136.65 104.06 KJ/mol. Based thermal deformation mechanism maps, predicted. transitioned from lattice diffusion control grain boundary control. At 250 °C, still controlled by slip, but as stress index increased after added, fractures lead formation dimples, thus improving performance.