Open AccessConstitutive behavior and novel characterization of hot deformation of Al-Zn-Mg-Cu aluminum alloy for lightweight traffic
Author(s) -
Hao Xin,
Ren G. Dong,
Jie Dong,
Haiming Zong,
Zheng-feng Lv
Publication year - 2021
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/abdc10
Subject(s) - materials science , deformation (meteorology) , strain rate , isothermal process , constitutive equation , alloy , compression (physics) , stress (linguistics) , strain (injury) , metallurgy , composite material , thermodynamics , structural engineering , finite element method , engineering , medicine , linguistics , philosophy , physics
Isothermal compression tests of 7A21 aluminum alloy were carried out on a Gleeble-3500 thermal simulator, and the stress-strain curves were obtained at temperatures ranging from 350 to 500 °C and strain rates ranging from 0.01 to 10 s −1 . The Arrhenius-type constitutive models with/without strain compensation were established to predict hot deformation mechanical behavior of the alloy based on friction and temperature corrected stress-strain curves, respectively. The model with strain compensation shows a higher prediction accuracy by calculating the average absolute relative error and correlation coefficient. The hot processing maps at different strains were constructed based on the dynamic material model (DMM). The safety strain rates map, a new form of processing map which reflects the variation of critical safety strain rates with the deformation temperatures and true strains, was generated to simplify the acquisition of safety zones throughout the whole deformation process.