Effect of hot deformation conditions on grain structure and properties of 7085 aluminum alloy
(State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China)
Abstract: The influences of deformation conditions on grain structure and properties of 7085 aluminum alloy were investigated by optical microscopy and transmission electron microscopy in combination with tensile and fracture toughness tests. The results show that the volume fraction of dynamic recrystallization increased with the decrease of Zener-Hollomon (Z) parameter, and the volume fraction of static recrystallization increased with the increasing of Z parameter. The strength and fracture toughness of the alloy after solution and aging treatment first increased and then decreased with the increase of Z parameter. The microstructure map was established on the basis of microstructure evolution during deformation and solution heat treatment. The optimization deformation conditions were acquired under Z parameters of 1.2×1010-9.1×1012.
Key words: 7085 aluminum alloy; Zener-Hollomon parameter; hot deformation; grain structure; dynamic recrystallization; static recrystallization