Evaluation of elastic-viscoplastic self-consistent models for a rolled AZ31B magnesium alloy under monotonic loading along five different material orientations and free-end torsion

Published on Sep 5, 2021in Journal of Magnesium and Alloys10.088
· DOI :10.1016/J.JMA.2021.07.023
Xianyun Zhu1
Estimated H-index: 1
(CSU: Central South University),
Yuqian Wang1
Estimated H-index: 1
(UNR: University of Nevada, Reno)
+ 2 AuthorsYanyao Jiang50
Estimated H-index: 50
(UNR: University of Nevada, Reno)
Sources
Abstract
Abstract null null Comprehensive experiments including monotonic tension and monotonic compression of specimens taken from a rolled AZ31B Mg thick plate along five different material orientations with respect to the rolled direction (RD), and free-end torsion of a tubular specimen machined along the thickness direction (ND) were conducted. The experimental results were used to evaluate an elastic-viscoplastic self-consistent model with the consideration of twinning and detwinning (EVPSC-TDT) on magnesium (Mg) alloys. The EVPSC-TDT model provides stress-strain curves and the hardening rates in close agreement with the experimental results of all the 11 loading cases. The model adequately predicts the textures after fracture of all the 11 loading cases and the evolutions of tension twins with increasing strains for tension in the ND, compression in the RD, and torsion along the ND. The Swift effect was observed in the experiment and was properly simulated by the model.
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References66
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Abstract A novel elasto-visco-plastic self-consistent (EVPSC) formulation based on the scheme of the homogeneous effective medium is presented. The constitutive behavior of a polycrystal is described as that of an elasto-visco-plastic effective medium interacting with grains treated as elasto-visco-plastic ellipsoidal inclusions. The formulation is based on the definition of a unique elasto-visco-plastic compliance, so avoiding the inconsistency arising from assuming superimposed elastic and vis...
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#1Padmeya Prashant Indurkar (UH: University of Houston)H-Index: 3
#2Shahmeer Baweja (UH: University of Houston)H-Index: 2
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Abstract This work systematically investigates the texture-property linkages in hexagonal close-packed (hexagonal) materials using a three-dimensional computational crystal plasticity approach. Magnesium and its alloys are considered as a model system. We perform full-field, large-strain, micromechanical simulations using a wide range of surrogate textures that sample several experimental datasets for a range of Mg alloys. The role of textural variability and the associated sensitivity of deform...
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#2Somjeet Biswas (IIT-KGP: Indian Institute of Technology Kharagpur)H-Index: 18
Last. Benoît Beausir (University of Lorraine)H-Index: 25
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Abstract In this work, the viscoplastic self-consistent based All Twin Variant (ATV) polycrystal modelling was employed to decipher the deformation behaviour of Mg–3Al-0.3Mn Magnesium alloy that develops { 10 1 ¯ 2 } 1 ¯ 011 - extension twins profoundly during ambient temperature compression. Twinning was considered by taking into account all the potential { 10 1 ¯ 2 } − twin variants, and hence called here as the ‘ATV’ approach. The model treats each twin variant as a grain with increasing volu...
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#1Yuqian Wang (UNR: University of Nevada, Reno)H-Index: 1
#2Duke Culbertson (UNR: University of Nevada, Reno)H-Index: 6
Last. Yanyao Jiang (UNR: University of Nevada, Reno)H-Index: 50
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Abstract Material orientation effects on cyclic deformation and fatigue of a rolled AZ31B magnesium (Mg) alloy were experimentally studied. Monotonic tension, monotonic compression, and fully reversed strain-controlled tension-compression experiments were conducted using testing specimens taken from a rolled plate along five different directions with respect to the rolled direction (RD): 0 ° (RD) 22 . 5 ° , 45 ° 67 . 5 ° , and 90 ° (ND). Fatigue lives range from few loading cycles to over 10 6 c...
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#2Devin Adams (BYU: Brigham Young University)H-Index: 2
Last. Marko Knezevic (UNH: University of New Hampshire)H-Index: 55
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Abstract The impact of twin transmission between neighboring grains as a contributor to overall twin activity is considered via a neighborhood viscoplastic self-consistent (NVPSC) model. The NVPSC model is an extension of a stochastic model for twin nucleation developed by Niezgoda et al. and a dislocation density based hardening law model developed by Knezevic et al. Beyond the baseline combined framework, the new model tracks sets of neighboring grains and allows twin transmission between them...
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The in-plane mechanical anisotropy of magnesium alloy sheet, which significantly influences the design of the parts produced by Mg alloy sheets, is of great importance regarding its wide application. Though the stress–strain response and texture evolution have been intensively investigated, and the anisotropy of Mg alloy can be significantly substantiated by its R-value, which reveals the lateral response of a material other than the primary response. As a consequence, the conjunction of viscopl...
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ABSTRACTCross-grain twin pairing was studied utilising in situ optical microscopy and ex situ electron backscatter diffraction in extruded pure magnesium subjected to tension in the direction perpendicular to the extrusion direction. A twin chain spanning over seven grains was rapidly developed through twin propagation and conjoining. Formation of cross-grain twin pair by twin thickening was in/ex situ observed for the first time. It was confirmed that variant selection of the cross-grain twins ...
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#1Peng Chen (UNR: University of Nevada, Reno)H-Index: 7
#2Bin Li (UNR: University of Nevada, Reno)H-Index: 30
Last. Yanyao Jiang (UNR: University of Nevada, Reno)H-Index: 50
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Abstract Extruded magnesium alloys with a strong basal texture present a strong tension-compression asymmetry in deformation due to the fact that dislocation slips dominate plastic deformation in tension along the extrusion direction (ED) whereas twinning dominates plastic deformation in compression along the ED. The deformation characteristics allows for a study of the twin-slip interaction by introducing dislocations in the material before activating twinning. In the current work, dislocations...
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Cited By1
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#1Yuqian Wang (UNR: University of Nevada, Reno)H-Index: 1
#2Qin Yu (UNR: University of Nevada, Reno)H-Index: 23
Last. Yanyao Jiang (UNR: University of Nevada, Reno)H-Index: 50
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Abstract null null Wrought magnesium (Mg) alloys display pronounced anisotropy in their room-temperature mechanical responses. The fracture behavior of Mg alloys, especially its reliance of material orientation, has not been well explored. The current work is an investigation of the anisotropic fracture behavior in a rolled AZ31B Mg alloy by carrying out monotonic tension experiments of specimens taken from the rolled Mg plate with five different material orientations (θ = 0°, 22.5°, 45°, 67.5° ...
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