Multi-directional forging of AZ61Mg alloy under decreasing temperature conditions and improvement of its mechanical properties

Miura, Hiromi; Yu, Gegang; Yang, Xuyue

doi:10.1016/j.msea.2011.05.050

Cited by 136 publications

(73 citation statements)

References 24 publications

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“…MDFing was carried out using pass strains of Δε = 0.5 to cumulative strains of ΣΔε = 1.5 at maximum. Such cumulative strains are much lower than those employed in previous reports 3,8) . The pass strains were reduced to Δε = 0.5 to avoid the buckling during MDFing at higher strain rates.…”

Section: Methodscontrasting

confidence: 56%

“…2. It can also be seen that the hardness approaches the values produced by MDFing to higher cumulative strains 3,8) . The higher proportion of β phase present in the AZ80Mg alloy compared with the AZ31…”

Section: Mechanical Propertiesmentioning

confidence: 62%

“…2 True stress vs. cumulative strain curves produced by multi-directional forging of AZ80Mg alloy at various true strain rates of (a) 3.0 × 10 strain regions. This should be due to evolution of UFGed structure, in which grain-boundary sliding is the most dominant deformation mechanism at elevated temperatures 8) . Grain-boundary sliding is more sensitive to strain rate than dislocation motion.…”

Section: Mdf Ow Curvesmentioning

confidence: 99%

“…More recently, Miura et al applied MDFing to AZ61Mg alloy and achieved UTS of 440 MPa at a reduced cumulative strain of ΣΔε = 4.0. They then increased the strength still further by ageing and cold rolling leading to UTS of 550 MPa with 25% ductility 8) . By carrying out these operations at elevated temperatures, they provoked the occurrence of dynamic recrystallization (DRX), which suppressed the formation and propagation of cracks 8,9) .…”

Section: Introductionmentioning

confidence: 99%

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Effects of Strain Rate during Multi-Directional Forging on Grain Refinement and Mechanical Properties of AZ80Mg Alloy

2016

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Samples of AZ80Mg alloy were multi-directionally forged (MDFed) at various strain rates in the rage from 3.0 × 10 −3 s −1 to 3.0 × 10under decreasing temperature conditions. The MDFing pass temperatures employed were 653 K, 605 K and 553 K. These passes, each of 0.5 strain, were applied up to a cumulative strain of ΣΔε = 1.5 at maximum. The average grain size decreased with increasing cumulative strain and depended only weakly on the strain rate. Microstructures with average grain sizes of 0.84 μm, 0.88 μm and 1.2 μm were attained when MDFed at strain rates of 3.0 × 10 −1 s −1 , 3.0 × 10 −2 s −1 and 3.0 × 10 −3 s −1. The microstructure evolved at 3.0 × 10 −1 s −1 was less homogeneous. This difference is interpreted as being due to the higher stored energy causing static recrystallization in the latter MDFing condition. As a result, the best balance of the mechanical properties was attained by MDFing at 3.0 × 10 −2 s −1. In this case, ultimate tensile strength (UTS) of 445 MPa was achieved together with a fracture strain of 22%. By comparison, MDFing at 3.0 × 10 −1 s −1 led to lower UTS and ductility of 410 MPa and 15% while the yield stresses were comparable.

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Section: Methodscontrasting

confidence: 56%

Section: Mechanical Propertiesmentioning

confidence: 62%

Section: Mdf Ow Curvesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Strain Rate during Multi-Directional Forging on Grain Refinement and Mechanical Properties of AZ80Mg Alloy

2016

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“…To produce magnesium alloys with ultrafine-grained or even nanocrystalline microstructure, severe plastic deformation (e.g. equal channel angular pressing, high-pressure torsion, multidirectional forging and mechanical milling) has been applied to magnesium alloys [5][6][7][8][9][10][11][12][13][14][15]. For example, a Mg-1.78Zn-0.89Mn alloy with average grain size of 700 nm was produced via two-step equal channel angular pressing process [16].…”

Section: Introductionmentioning

confidence: 99%

On the use of cryomilling and spark plasma sintering to achieve high strength in a magnesium alloy

Guan

Rainforth

Sharp

et al. 2016

Journal of Alloys and Compounds

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Effect of Pre‐Extrusion on the Microstructure and Properties of Forged Mg−Al−Zn−Ce Alloy

Wang

Yan

et al. 2021

Adv Eng Mater

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The effects of different morphologies of initial grains obtained by pre‐extrusion under different extrusion hole diameters or different extrusion temperatures on the microstructure and mechanical properties of forged Mg−Al−Zn−Ce alloy are studied. After homogenization treatment of as‐cast Mg−Al−Zn−Ce alloy, β‐Mg17Al12 phase is completely dissolved into the α‐Mg matrix. Then, pre‐extrusion deformation is conducted. Dynamic recrystallization (DRX) occurs during the pre‐extrusion process, and the initial grains with different grain sizes, second‐phase volume fractions, and textures are obtained. The pre‐extruded alloys show a strong basal plane (0001) texture and a monotonous increasing (or decreasing) change. After forging the pre‐extruded alloys, compared with the homogeneous forged alloy, the average grain size of the pre‐extruded‐forged (PEF) alloys is smaller and the texture strength is greatly weakened. As the microstructure of the pre‐extruded alloys, the PEF alloys show a monotonous increase (or decrease) in grain size, the volume fraction of the second phase, and texture strength. It is inferred that the microstructure and texture of PEF alloys evolve based on the microstructure and texture of the pre‐extruded alloys, and their mechanical properties are determined by the evolved microstructure and texture.

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Multi-directional forging of AZ61Mg alloy under decreasing temperature conditions and improvement of its mechanical properties

Cited by 136 publications

References 24 publications

Effects of Strain Rate during Multi-Directional Forging on Grain Refinement and Mechanical Properties of AZ80Mg Alloy

Effects of Strain Rate during Multi-Directional Forging on Grain Refinement and Mechanical Properties of AZ80Mg Alloy

On the use of cryomilling and spark plasma sintering to achieve high strength in a magnesium alloy

Effect of Pre‐Extrusion on the Microstructure and Properties of Forged Mg−Al−Zn−Ce Alloy

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