scholarly journals Effect of Loading Direction on the Tensile Properties and Texture Evolution of AZ31 Magnesium Alloy

Crystals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1193
Author(s):  
Yuyu Li ◽  
Tingzhuang Han ◽  
Zhibing Chu ◽  
Chun Xue ◽  
Qianhua Yang ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Texture Evolution ◽  
Extrusion Direction ◽  
Deformation Mode ◽  
Tensile Behavior ◽  
Mechanical Anisotropy ◽  
Az31 Magnesium Alloy ◽  
Prismatic Slip ◽  
Uniaxial Tensile ◽  
Loading Direction

Samples were cut from an extruded AZ31 magnesium alloy bar for uniaxial tensile and EBSD characterization tests. The long axis and bar extrusion directions were 0° (T0 sample), 45° (T45 sample), and 90° (T90 sample). The effects of loading direction on the tensile behavior, microstructure, and texture evolution of the magnesium alloy were studied. Results show that the obvious mechanical anisotropy of tensile behavior is affected by the loading direction, and the T0 sample with a grain c-axis perpendicular to the extrusion direction has a strong basal texture and high flow stress and yield strength. The loading direction has a significant influence on the microstructure characteristics of different samples, especially the number of {10–12} tensile twins and {10–11} compression twins. Texture evolution results show that the loading direction and the effect of deformation mode on the deformation mechanism lead to variations in texture evolution: the basal slip and prismatic slip during the plastic deformation of the T0 specimen, the compression twin of the T45 specimen, and the tensile twin of the T90 specimen.

scholarly journals Numerical study on the plastic deformation behavior of AZ31 magnesium alloy under different loading conditions

2021 ◽  
Vol 8 (12) ◽  
pp. 126505
Author(s):  
Yuyu Li ◽  
Bowen Yang ◽  
Tingzhuang Han ◽  
Zhibing Chu ◽  
Chun Xue ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Numerical Study ◽  
Texture Evolution ◽  
Extrusion Direction ◽  
Strain Curve ◽  
Az31 Magnesium Alloy ◽  
Pole Density ◽  
Loading Conditions ◽  
Secondary Compression ◽  
Plastic Deformation Behavior

Abstract Based on the stress characteristics of the instantaneous cross-section deformation of the wall reducing section during the cold rolling of two-roll Pilger pipes, the rectangular samples with 0° and 90° to the extrusion direction (ED) were cut from the extruded AZ31 magnesium alloy bar for 3% pre-deformation test to simulate its stress state equivalently. The sample was then cut from the pre-deformed sample by wire cutting for secondary compression, and the sample that is not pre-deformed is selected. The mechanical behavior and texture evolution of AZ31 magnesium alloy under different loading conditions were respectively studied by EBSD experiment and VPSC simulation. Results show that the true stress–strain curve and texture evolution characteristics of AZ31 magnesium alloy during the secondary compression process are in good agreement with the prediction of the VPSC model. The secondary compression behavior can be effectively explained by the relative activity of the deformation modes. The pre-deformation in the ∥ED (⊥ED) direction is conducive to the shift of the pole density of the {0001} basal surface texture to the positive and negative directions of the ED (TD). The pre-deformed sample exhibits a higher yield strength than the non-pre-deformed sample in the same loading direction. The high ductility of magnesium alloys can be achieved by activating pyramidal 〈c + a〉 slippage.

Anisotropy in tensile behavior of an extruded Mg-4.50Zn-1.13Ca (wt.%) alloy

2021 ◽  
Vol 112 (10) ◽  
pp. 787-793
Author(s):  
Yuzhou Du ◽  
Mingyi Zheng ◽  
Yanfeng Ge ◽  
Bailing Jiang
Keyword(s):  
Tilt Angle ◽  
Basal Slip ◽  
Tensile Deformation ◽  
Extrusion Direction ◽  
Deformation Mode ◽  
Tensile Behavior ◽  
Prismatic Slip ◽  
Basal Texture ◽  
Tensile Direction ◽  
Deformation Modes

Abstract The present study investigated anisotropy in tensile behavior of an extruded Mg-4.50Zn-1.13Ca (wt.%) alloy through tensile testing along different tilt angles relative to the extrusion direction. Results showed that the as-extruded Mg-4.50Zn-1.13Ca (wt.%) alloy exhibited anisotropy in tensile behavior due to the formation of basal texture. Basal slip, prismatic slip and tensile twinning were the dominant deformation modes depending on the tensile direction. Prismatic slip was the dominant deformation mode for samples with small tilt angle (θ = 0° and 22.5°). Basal slip was activated when the tilt angle was increased, which also resulted in the decrease of yield strength. Tensile twinning was responsible for the yielding of the samples with high tilt angles (θ = 67.5° and 90°). The ductility was significantly reduced at high tilt angle, which was mainly attributed to the appearance of tensile twinning during tensile deformation.

scholarly journals Twinning and texture development in an extruded AM30 magnesium alloy during compressive deformation

2021 ◽  
Author(s):  
Dyuti Sarker
Keyword(s):  
Magnesium Alloy ◽  
Volume Fraction ◽  
Texture Evolution ◽  
Flow Behavior ◽  
True Strain ◽  
Compressive Strain ◽  
Extrusion Direction ◽  
Compressive Deformation ◽  
Strain Behavior ◽  
Loading Direction

This study was aimed at evaluating the microstructure, mechanical behavior and texture response of extruded AM30 magnesium alloy in uniaxial compression with special attention to the effect of compressive strain amount, sample orientation, loading direction, compressive prestrain, and annealing. Compressive deformation along the extrusion direction (ED) resulted in sigmoidal true stress-true strain behavior together with three distinct stages of strain hardening, due to the presence of two sets of basal textures {0001}<2110> and {0001}<1010>, with caxes aligned nearly parallel to the normal direction (ND) of the extruded plate which facilitated the occurrence of {1012} extension twinning. The effect of in-plane loading direction, i.e., 0°,15°, 30°, 45° from the ED on the compressive flow behavior was investigated, which revealed nearly constant yield and ultimate compressive strengths but with a remarkable increase of fracture strain compared to the ED sample. The effect of pre-strain along the ED on the formation of twinning and texture was investigated during re-compression along the ED, transverse direction (TD) and ND. In the two-step ED-ED compression, the disappearance of twin boundaries or the coalescence of twins via twin growth was observed. After pre-strain along the ED, re-compression along the TD showed two seemingly opposite phenomena, i.e., the formation of new twins and de-twinning to be coexistent due to the presence of multiple sets of textures after the first-step pre-straining. The de-twinning activity decreased and the texture weakening was achieved with increasing pre-strain in the ED while doing recompression along the ND at a constant strain amount. Texture measurements revealed that the c-axes of hcp unit cells were always rotated towards the compression direction, regardless of compression in the ED, TD or ND. The annealing temperature and time also had a pronounced effect on microstructure and texture evolution. With increasing annealing time, the twins in the pre-compressed samples were observed to disappear gradually, as demonstrated by a decreased volume fraction of twins and weakened texture which became more randomly distributed. As a result, during re-compression along the ED, fewer twin formation and less intense texture were observed, resulting in a significant increase of ductility.

The Orientation Dependence of Strain Hardening and Texture Development in an Extruded Magnesium Alloy

2014 ◽  
Vol 783-786 ◽  
pp. 363-368 ◽  
Author(s):  
D. Sarker ◽  
Dao Lun Chen
Keyword(s):  
Magnesium Alloy ◽  
Strain Hardening ◽  
Texture Evolution ◽  
Extrusion Direction ◽  
Orientation Dependence ◽  
Mechanical Anisotropy ◽  
Hardening Behavior ◽  
Compression Direction ◽  
Texture Change ◽  
Strain Hardening Behavior

Extruded magnesium alloys showed mechanical anisotropy due to the development of strong crystallographic textures during forming processes. In the present study the strain hardening behavior and texture evolution of an extruded AM30 magnesium alloy were studied in compression using cylindrical samples oriented at angles of 0°, 15°, 30°, 45° and 90° from the extrusion direction (ED). The yield strength decreased with increasing angle up to 45° and then increased at 90° from the ED, while the ultimate compressive strength exhibited a reverse trend. Both hardening capacity and fracture strain first increased from 0° to 45° and then decreased at 90° from the ED. The strain hardening behavior was directly related to the texture change and twinning, which played a key role in accommodating the compressive deformation, as the c-axes in most grains were observed to rotate always towards the anti-compression direction, irrespective of the sample orientation.

scholarly journals Twinning and texture development in an extruded AM30 magnesium alloy during compressive deformation

2021 ◽  
Author(s):  
Dyuti Sarker
Keyword(s):  
Magnesium Alloy ◽  
Volume Fraction ◽  
Texture Evolution ◽  
Flow Behavior ◽  
True Strain ◽  
Compressive Strain ◽  
Extrusion Direction ◽  
Compressive Deformation ◽  
Strain Behavior ◽  
Loading Direction

This study was aimed at evaluating the microstructure, mechanical behavior and texture response of extruded AM30 magnesium alloy in uniaxial compression with special attention to the effect of compressive strain amount, sample orientation, loading direction, compressive prestrain, and annealing. Compressive deformation along the extrusion direction (ED) resulted in sigmoidal true stress-true strain behavior together with three distinct stages of strain hardening, due to the presence of two sets of basal textures {0001}<2110> and {0001}<1010>, with caxes aligned nearly parallel to the normal direction (ND) of the extruded plate which facilitated the occurrence of {1012} extension twinning. The effect of in-plane loading direction, i.e., 0°,15°, 30°, 45° from the ED on the compressive flow behavior was investigated, which revealed nearly constant yield and ultimate compressive strengths but with a remarkable increase of fracture strain compared to the ED sample. The effect of pre-strain along the ED on the formation of twinning and texture was investigated during re-compression along the ED, transverse direction (TD) and ND. In the two-step ED-ED compression, the disappearance of twin boundaries or the coalescence of twins via twin growth was observed. After pre-strain along the ED, re-compression along the TD showed two seemingly opposite phenomena, i.e., the formation of new twins and de-twinning to be coexistent due to the presence of multiple sets of textures after the first-step pre-straining. The de-twinning activity decreased and the texture weakening was achieved with increasing pre-strain in the ED while doing recompression along the ND at a constant strain amount. Texture measurements revealed that the c-axes of hcp unit cells were always rotated towards the compression direction, regardless of compression in the ED, TD or ND. The annealing temperature and time also had a pronounced effect on microstructure and texture evolution. With increasing annealing time, the twins in the pre-compressed samples were observed to disappear gradually, as demonstrated by a decreased volume fraction of twins and weakened texture which became more randomly distributed. As a result, during re-compression along the ED, fewer twin formation and less intense texture were observed, resulting in a significant increase of ductility.

Deformation and texture evolution in AZ31 magnesium alloy during uniaxial loading

2006 ◽  
Vol 54 (2) ◽  
pp. 549-562 ◽  
Author(s):  
S.-B. Yi ◽  
C.H.J. Davies ◽  
H.-G. Brokmeier ◽  
R.E. Bolmaro ◽  
K.U. Kainer ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Texture Evolution ◽  
Uniaxial Loading ◽  
Az31 Magnesium Alloy

Grain Structure Formation Ahead of Tool during Friction Stir Welding of AZ31 Magnesium Alloy

2010 ◽  
Vol 160 ◽  
pp. 313-318 ◽  
Author(s):  
Uceu Suhuddin ◽  
Sergey Mironov ◽  
H. Takahashi ◽  
Yutaka S. Sato ◽  
Hiroyuki Kokawa ◽  
...  
Keyword(s):  
Friction Stir Welding ◽  
Magnesium Alloy ◽  
Structure Formation ◽  
Material Flow ◽  
Boundary Migration ◽  
Deformation Mode ◽  
Grain Structure ◽  
Az31 Magnesium Alloy ◽  
Structure Evolution ◽  
Friction Stir

The “stop-action” technique was employed to study grain structure evolution during friction-stir welding of AZ31 magnesium alloy. The grain structure formation was found to be mainly governed by the combination of the continuous and discontinuous recrystallization but also involved geometric effect of strain and local grain boundary migration. Orientation measurements showed that the deformation mode was very close to the simple shear associated with the rotating pin and material flow arose mainly from basal slip.

scholarly journals Investigation of the In-Plane Mechanical Anisotropy of Magnesium Alloy AZ31B-O by VPSC–TDT Crystal Plasticity Model

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1590 ◽  
Author(s):  
Bo Zhang ◽  
Shuangming Li ◽  
Huamiao Wang ◽  
Weiqin Tang ◽  
Yaodong Jiang ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Texture Evolution ◽  
Mg Alloys ◽  
Mechanical Anisotropy ◽  
Mg Alloy ◽  
Loading Path ◽  
Crystallographic Structure ◽  
Stress Strain ◽  
Magnesium Alloy Az31b ◽  
R Value

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 viscoplastic self-consistent model and twinning and detwinning scheme (VPSC–TDT) is employed to investigate the in-plane anisotropy of magnesium alloy AZ31B-O sheet. The loading cases include both tension and compression along different paths with respect to the processing direction of the sheet. It is revealed that the stress–strain relation, texture evolution, R-value, and involved deformation mechanisms are all loading path-dependent. The unique R-values of Mg alloys are interpreted with the aid of modeling behaviors of Mg single crystals. The results agree well with the corresponding experiments. It is found that the hexagonal close-packed (HCP) crystallographic structure, deformation twinning, and initial basal texture are responsible for the characteristic behavior of Mg alloys.

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