Journal ArticleDOI
Crystal plasticity modeling and neutron diffraction measurements of a magnesium AZ31B plate: Effects of plastic anisotropy and surrounding grains
Huamiao Wang,Soo Yeol Lee,E. Wen Huang,Jayant Jain,Dayong Li,Yinghong Peng,Ho-Suk Choi,Peidong Wu +7 more
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TLDR
In this paper, the authors used in-situ neutron diffraction measurements and Elastic ViscoPlastic Self-Consistent polycrystal plasticity model, which incorporates a twinning and de-twinning scheme (denoted by EVPSC-TDT), to examine the macro-and micro-mechanical behaviors of a rolled AZ31B plate subjected to uniaxial tension.Abstract:
This study used in-situ neutron diffraction measurements and Elastic ViscoPlastic Self-Consistent polycrystal plasticity model, which incorporates a Twinning and DeTwinning scheme (denoted by EVPSC-TDT), to examine the macro-and micro-mechanical behaviors of a rolled AZ31B plate subjected to uniaxial tension. Three specimens were specifically designed for minimum, maximum and intermediate twinning: (1) loading along the rolling direction, (2) loading along the plate normal, and (3) loading along the direction 45° with respect to the plate normal. Apart from the macroscopic stress strain response, the measured diffraction intensities and internal elastic strains were obtained to examine the activities of the deformation modes at the grain level. The diffraction intensity evolution signaled the volume fraction change of twinning, while the internal elastic strain evolution designated the stress partitioning among the grain orientations. The effect of the surrounding grains on the development of the internal elastic strain was investigated by identifying the corresponding deformation mechanisms. Notably, the corresponding modeling work revealed that the EVPSC-TDT model permitted the prediction of the strain hardening and anisotropic behavior along the directions with minimum, maximum and intermediate twinning at the macroscale, and the evolution of the diffraction intensities and internal strains at the microscale. The results provide a physical understanding of the effects of the load direction, texture and surrounding grains on the role of the deformation modes in hexagonal close-packed polycrystalline materials.read more
Citations
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On the nucleation of deformation twins at the early stages of plasticity
TL;DR: In this article, the development of grain-level stress tensors during nucleation and growth of twins is investigated, and the evolution of stress in twin-parent pairs at the early stages of plasticity, further into plasticity zone, and unload is studied.
Journal ArticleDOI
Influence of yttrium addition on recrystallization, texture and mechanical properties of binary Mg–Y alloys
TL;DR: In this paper, the influence of yttrium (Y) addition on the recrystallization, texture and mechanical properties of Mg-Y alloys has been examined, and the results suggested that increasing the Y content substantially retards the re-stallization kinetics, which was attributed to the increase in the extent of pinning of the grain boundaries due to an increase in solutes.
Journal ArticleDOI
Effects of texture and twinning on the torsional behavior of magnesium alloy solid rod: A crystal plasticity approach in comparison with uniaxial tension/compression
TL;DR: In this article, the elastic visco-plastic self-consistent model with the twinning and detwinning scheme, in conjunction with a torsion specific finite element approach, is employed to model the deformation behavior of magnesium alloy AZ31 solid rod with different initial textures, including ideal basal, rolled, extruded, and random.
Journal ArticleDOI
The effect of stress state and strain partition mode on the damage behavior of a Mg-Ca alloy
TL;DR: In this article, a comprehensive study was conducted to uncover the underlying damage mechanism of a Mg-0.5%wtCa alloy by using mechanical tests with different stress states, microstructure characterization and the crystal plasticity finite element method (CPFEM).
Journal ArticleDOI
Crystal plasticity modeling of the multiaxial ratchetting of extruded AZ31 Mg alloy
Hang Li,Chao Yu,Guozheng Kang +2 more
TL;DR: In this paper , a constitutive model was developed in the framework of crystal plasticity for the Mg alloy single crystal at finite strain, and three different kinematic hardening laws were presented to capture the evolutions of back stresses associated with different deformation mechanisms, respectively, from macroscopic and microscopic experimental results.
References
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Journal ArticleDOI
Plastic anisotropy and the role of non-basal slip in magnesium alloy AZ31B
Sean R. Agnew,Ozgur Duygulu +1 more
TL;DR: In this paper, a combination of experimental and simulation techniques were used to investigate the plastic behavior of wrought magnesium alloy and found that an increased activity of non-basal dislocations provides a self-consistent explanation for the observed changes in the anisotropy with increasing temperature.
Journal ArticleDOI
Hardening evolution of AZ31B Mg sheet
TL;DR: In this article, the monotonic and cyclic mechanical behavior of O-temper AZ31B Mg sheet was measured in large-strain tension/compression and simple shear.
Journal ArticleDOI
Role of {10–12} twinning characteristics in the deformation behavior of a polycrystalline magnesium alloy
TL;DR: In this paper, the activation of specific twin variants depending on the strain path induced a significant difference in twinning characteristics, such as twin morphology, volume fraction of twins with strain, and twin texture, and consequently gave rise to a totally different effect on the deformation.
Journal ArticleDOI
Modeling the effect of twinning and detwinning during strain-path changes of magnesium alloy AZ31
TL;DR: In this paper, the role of the twins as barriers to dislocations is explicitly incorporated into the hardening description of slip deformation via a directional Hall-Petch mechanism.
Journal ArticleDOI
Twinning–detwinning behavior during the strain-controlled low-cycle fatigue testing of a wrought magnesium alloy, ZK60A
L. Wu,A. Jain,Donald W. Brown,G.M. Stoica,Sean R. Agnew,Bjørn Clausen,D.E. Fielden,Peter K. Liaw +7 more
TL;DR: In this article, the twinning and detwinning behavior in a strongly textured magnesium alloy was investigated using in situ neutron diffraction during the cyclic deformation along the prior extrusion direction at the fully reversed total constant strain amplitude of 1.2% at room temperature.
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Plastic anisotropy and the role of non-basal slip in magnesium alloy AZ31B
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