Modeling of the thermo-mechanical response and texture evolution of WE43 Mg alloy in the dynamic recrystallization regime using a viscoplastic self-consistent formulation

This paper presents a microstructure sensitive model for predicting mechanical response and texture evolution of metals in the dynamic recrystallization regime. A recently proposed viscoplastic self-consistent (VPSC) formulation for the prediction of recrystallization driven by strain energy and int...

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Bibliographic Details
Published in:International journal of plasticity Vol. 130; p. 102705
Main Authors: Zecevic, Miroslav, Knezevic, Marko, McWilliams, Brandon, Lebensohn, Ricardo A.
Format: Journal Article
Language:English
Published: New York Elsevier Ltd 01.07.2020
Elsevier BV
Elsevier
Subjects:
A microstructures
A thermomechanical processes
Alloying elements
B constitutive behavior
C numerical algorithms
Compressive strength
Constitutive behavior
Dynamic recrystallization
Evolution
Grain boundaries
Magnesium base alloys
MATERIALS SCIENCE
Mechanical analysis
Microstructures
Misalignment
Nucleation
Numerical algorithms
Precipitates
Slip resistance
Superplasticity
Temperature
Texture
Thermomechanical processes
VPSC model
VPSC model
A thermomechanical processes
B constitutive behavior
C numerical algorithms
A microstructures
ISSN:0749-6419, 1879-2154
Online Access:Get full text
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Summary:This paper presents a microstructure sensitive model for predicting mechanical response and texture evolution of metals in the dynamic recrystallization regime. A recently proposed viscoplastic self-consistent (VPSC) formulation for the prediction of recrystallization driven by strain energy and intragranular misorientation is extended to hexagonal close-packed (hcp) metals. The model is applied to the dynamic recrystallization of magnesium alloy WE43 at different temperatures and strain rates. Model predictions in terms of stress-strain response and texture evolution are compared to the experimental measurements and acceptable agreement is achieved. According to the model predictions, superplastic behavior of nuclei was found to be the dominant softening mechanism at high temperatures and low strain rates. High concentration of precipitates at the grain boundaries and presence of alloying elements are the likely causes of low boundary mobility, resulting in nucleation dominated dynamic recrystallization. Relatively strong basal compression textures indicate dominant activity of basal slip, which can be achieved only through large difference in slip resistance between soft basal and hard prismatic and pyramidal modes. •Dynamic recrystallization nuclei remain small due to low boundary mobility.•Superplastic behavior of recrystallization nuclei causes strong softening.•Pyramidal and prismatic slips are considerably harder than basal slip.•Sharp increase of dislocation removal observed at elevated temperatures.
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content type line 14
89233218CNA000001
LA-UR-19-28936
US Army Research Laboratory (USARL)
USDOE National Nuclear Security Administration (NNSA)
USDOE-USDOD Joint Munitions Program
ISSN:0749-6419
1879-2154
DOI:10.1016/j.ijplas.2020.102705