Open AccessInfluence of strain rate on microstructures and mechanical properties of 2524Al alloy fabricated by a novel large strain rolling
Author(s) -
Xvhui Feng,
Yi-Fei Sun,
Shuaixiao Zhou,
Jiangmei He
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ab70e0
Subject(s) - materials science , microstructure , ultimate tensile strength , alloy , elongation , annealing (glass) , ductility (earth science) , dendrite (mathematics) , metallurgy , grain size , strain rate , accumulative roll bonding , composite material , creep , geometry , mathematics
2524Al alloy sheets with excellent strength-ductility balance were successfully fabricated by large strain rolling in a strain rate range from 5 s −1 to 20 s −1 at 400 °C. The microstructural evolution, mechanical properties and fracture mechanism of the as-rolled sheets were investigated. The results show that there are numerous coarse precipitates of Al 2 CuMg and Al 2 Cu along the dendrite grain boundaries for as-cast 2524Al alloy. Most of the precipitates disappear after homogenizing annealing treatment. Grain refining plays a key role in the as-rolled microstructural evolution and the mechanical properties. The dendrite grain were broken and become streamline structure after rolled. The sheet fabricated at 10 s −1 exhibits a higher strength and excellent ductility, with the ultimate tensile strength and elongation of 611MPa and 10.5%, respectively.