Superplastic characterization of 2095 Al-Li alloy processed by equal channel angular extrusion Conference Paper uri icon

abstract

  • The superplastic behavior of 2090 (Al-Cu-Li-Mg-Ag-Zr) alloy has been investigated. The material was processed by equal channel angular extrusion (ECAE) with the intent of producing an ultra-fine submicron grained (SMG) structure. The effect of warm rolling (WR) on the superplastic response of the ECAE processed alloy was assessed. The rate-controlling deformation mechanisms for the different thermomechanical processing (TMP) conditions were characterized by step-strain rate tests. The rate-controlling deformation mechanism was assessed by comparing the experimental creep rates with the Sherby model for SMG structures. The ECAE and the ECAE+warm rolled (WR) processed material exhibited % elongation-to-failure >400% with strain rate sensitivities (m) of 0.38 at 490 °C and 0.44 at 450 °C respectively at a stain rate of 2×10-3 s-1. The ECAE processed alloys had activation energies corresponding to lattice diffusion, while the ECAE+WR processed alloys had activation energies corresponding to grain boundary diffusion.

author list (cited authors)

  • Salem, H. G., Goforth, R. E., & Hartwig, K. T.

publication date

  • January 1998