Effect of Homogenization Treatment Regime on Microstructure, Recrystallization Behavior, Mechanical Properties, and Superplasticity of Al-Cu-Er-Zr Alloy

• DOI: 10.1007/s11837-021-04766-z
• Publication Date: 2021-07-13T15:03:24Z
• Authors: S. M. Amer; A. V. Mikhaylovskaya; R. Yu. Barkov; A. D. Kotov; A. G. Mochugovskiy; O. A. Yakovtseva; M. V. Glavatskikh; I. S. Loginova; S. V. Medvedeva; A. V. Pozdniakov
• Keywords: Superplasticity; Recrystallization (geology); Elongation; Homogenization; Nanocrystalline material

Aluminum-based alloys with advanced processing and service properties are required for the automotive and airspace industries. The current study focuses on the microstructure, recrystallization behavior, and elevated- and room-temperatures tensile properties of the novel Al-Cu-Er-Zr-based alloy pretreated using different homogenization annealing regimes. Aluminum solid solution, Al8Cu4Er phases of crystallization origin, and nanoscale L12-Al3(Er,Zr) precipitates were observed in the studied alloy. The alloy exhibited a non-recrystallized structure after annealing of cold-rolled sheets at 300°C, with yield strength of 300 MPa and ultimate tensile strength of 330 MPa at room temperature. The fine-grained structure of the alloy provided superplasticity with elongation to failure up to 450% in the temperature range of 550°C to 605°C and a strain rate range of 10–3 s–1 to 10–2 s–1.