Open AccessHOT DEFORMATION BEHAVIOR AND PROCESSING MAP OF A Mg-Gd-Y-Zn-Zr ALLOY
Author(s) -
Zhaoming Yan,
Jiaxuan Zhu,
Zhimin Zhang,
Qiang Wang,
Yong Xue
Publication year - 2021
Publication title -
materiali in tehnologije
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.27
H-Index - 25
eISSN - 1580-3414
pISSN - 1580-2949
DOI - 10.17222/mit.2021.212
Subject(s) - materials science , dynamic recrystallization , strain rate , flow stress , dissipation , deformation (meteorology) , hot working , activation energy , alloy , work hardening , composite material , atmospheric temperature range , metallurgy , strain hardening exponent , hyperbolic function , thermodynamics , microstructure , mathematical analysis , chemistry , physics , mathematics , organic chemistry
Compression tests of a Mg-13Gd-4Y-2Zn-0.5Zr alloy were carried out on a Gleeble-1500D thermo-mechanical simulator within a temperature range of 420–500 °C and strain rate of 0.001–5 s–1 so that the corresponding flow behavior was investigated. The Zener-Hollomon parameter Z was used in a hyperbolic-sine-type equation to express the relationships between the peak stress, deformation temperature and strain rate. Work hardening, dynamic recovery and dynamic recrystallization were the main characteristics affecting the plastic-deformation behaviors. The activation energy Q was calculated to be 208.2 kJ/mol and processing maps at strains of 0.3, 0.5 and 0.7 were generated based on a dynamic material model. The optimum processing parameters were obtained with a power-dissipation analysis.