Modeling dynamic recrystallization during hot deformation of a cast-homogenized Mg-Zn-Zr alloy

被引:42
|
作者
Hadadzadeh, A. [1 ]
Mokdad, F. [2 ]
Wells, M. A. [1 ]
Chen, D. L. [2 ]
机构
[1] Univ Waterloo, Mech & Mechatron Engn Dept, 200 Univ Ave West, Waterloo, ON N2L 3G1, Canada
[2] Ryerson Univ, Dept Mech & Ind Engn, 350 Victoria St, Toronto, ON M5B 2K3, Canada
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2018年 / 720卷
基金
加拿大自然科学与工程研究理事会;
关键词
Hot deformation; Magnesium alloy; Electron backscatter diffraction (EBSD); Dynamic recrystallization (DRX); Avrami equation; DRX kinetics model; ZK60 MAGNESIUM ALLOY; MICROSTRUCTURAL EVOLUTION; MECHANICAL-PROPERTIES; TEXTURE EVOLUTION; STAINLESS-STEEL; PROCESSING MAPS; KINETICS MODEL; PHASE-CHANGE; Y ALLOY; BEHAVIOR;
D O I
10.1016/j.msea.2018.02.064
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Hot deformation of a cast-homogenized ZK60 magnesium alloy was studied in terms of dynamic recrystallization (DRX) kinetics. The alloy was isothermally compressed under uniaxial loading at 400 degrees C and 450 degrees C with varying strain rates of 0.001, 0.01 and 0.1 s(-1). The DRX fraction of each deformation condition was determined via electron backscatter diffraction (EBSD) analysis. DRX kinetics during hot deformation was investigated using an Avrami-DRX equation. For the sake of comparison, Avrami-SRX (static recrystallization) modeling was also employed. Both models were calibrated and validated for hot deformation of the alloy. It was observed that the Avrami-DRX model could be successfully used to predict the DRX kinetics except for the lowest DRX fraction (i.e., deformation at 400 degrees C/0.1 s(-1)). Moreover, the Avrami-SRX model was in good agreement with the Avrami-DRX model for deformation at the lowest strain rate (i.e., 0.001 s(-1)). With increasing strain rate, Avrami-SRX model became increasingly less viable. This was mainly attributed to the smaller than 50% recrystallized fractions at 0.01-0.1 s(-1).
引用
收藏
页码:180 / 188
页数:9
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