Microstructure and mechanical properties of ZK21 magnesium alloy fabricated by multiple forging at different strain rates

Wu, Yuanzhi; Yan, Hongge; Chen, Jihua; Du, Yanxia; Zhu, S.Q.; Su, Bin

doi:10.1016/j.msea.2012.06.074

Cited by 29 publications

(10 citation statements)

References 25 publications

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“…Chen et al produced an AZ61 [ 12 , 13 ] and an Mg-Gd-Y-Zr [ 14 ] alloy by adopting small strain impact multidirectional forging; the related microstructure, texture and mechanical properties of the forged alloys have been studied. In our previous studies, we have successfully produced ZK60 [ 15 ], ZK21 [ 16 ] and AZ31 [ 17 ] magnesium alloys through high strain rate triaixal forging, and the results prove that those alloys display excellent balance of strength and ductility resulting from grain refinement.…”

Section: Introductionmentioning

confidence: 98%

“…For example, the metal flows to the radius and axial direction in uniaxial and biaxial forging, respectively, while no obvious dimension change takes place in triaxial forging because of the cycle change of the three orthogonal forging directions. To date, the microstructure and properties of magnesium alloys fabricated by high strain rate uniaxial forging [ 11 ] and triaxial forging [ 12 , 13 , 14 , 15 , 16 , 17 ] have been investigated. High strain rate biaxial forging (HSRBF) is a kind of the severe plastic deformation (SPD) techniques; however, the microstructure, texture and properties of magnesium alloy fabricated by this method are still unknown.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure, Texture and Mechanical Properties of AZ31 Magnesium Alloy Fabricated by High Strain Rate Biaxial Forging

Ji-zhao

Deng

et al. 2020

Materials

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High strain rate biaxial forging (HSRBF) was performed on AZ31 magnesium alloy to an accumulated strain of ΣΔε = 1.32, the related microstructure, texture and mechanical properties were investigated. It was found that the microstructure evolution can be divided into two steps during HSRBF. In the early forging processes, the refinement of the grain is obvious, the size of ~10 μm can be achieved; this can be attributed to the unique mechanisms including the formation of high density twins ({101(-)2} extension twin and {101(-)1}-{101(-)2} secondary twin) and subsequently twining induced DRX (dynamic recrystallization). The thermal activated temperature increases with the increase of accumulated strain and results in the grain growth. Rolling texture is the main texture in the high strain rate biaxial forged (HSRBFed) alloys, the intensity of which decreases with the accumulated strain. Moreover, the basal pole rotates towards the direction of forging direction (FD) after each forging pass, and a basal texture with basal pole inclining at 15–20° from the rolling direction (RD) is formed in the full recrystallized HSRBFed alloys. The grain refinement and tiled texture are attributed to the excellent strength and ductility of HSRMBFed alloys with full recrystallized structure. As the accumulated strain is ΣΔε = 0.88, the HSRMBFed alloy displays an outstanding combination of mechanical properties, the ultimate tensile strength (UTS) is 331.2 MPa and the elongation is 25.1%.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Microstructure, Texture and Mechanical Properties of AZ31 Magnesium Alloy Fabricated by High Strain Rate Biaxial Forging

Ji-zhao

Deng

et al. 2020

Materials

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“…For example, Chen et al has successfully produced AZ61 [11][12][13] and Mg-Gd-Y-Zr [14] alloy by adopting small strain impact multidirectional forging, meanwhile, the related microstructure, texture and mechanical properties of the forged alloys have been investigated. In our previous research, high strain rate multiple forging were successfully carried out on ZK60 [15], ZK21 [16] and AZ31 [17] magnesium alloys by using an industrial air pneumatic hammer machine, and excellent balance of strength and ductility were achieved in those alloys owing to grain refinement. As we know, the microstructure and performances of forging products are determined by the processing parameters such as the deformation route, deformation temperature, strain rate and strain [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Pass Strain on the Microstructure, Texture and Mechanical Properties of AZ31 Magnesium Alloy Fabricated by High Strain Rate Multiple Forging

Deng

Tuo

et al. 2020

Metals

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High strain rate multiple forging (HSRMF) with pass strain ranging from 0.1 to 0.35 was carried out on the AZ31 magnesium alloy, and the microstructure, texture and mechanical properties were examined. The initial grain can be refined through the formation of high density {102} and {101(-)1}-{101(-)2} twins and subsequently twining induced dynamic recrystallization (DRX). The grain refinement of the HSRMFed alloy was affected by the lamellar thickness of the twin. Lower pass strain (Δε = 0.1) during HSRMF leads to the thick twin lamellae and consequently results in coarse DRX grain, meanwhile, an incomplete DRX occurs. While the twin lamellae thickness decreases with increasing pass strain, and a saturate thickness can be achieved with higher pass strain (Δε = 0.16–0.35), which results in the finer DRX structure. Homogeneous DXR structure can be obtained only at a proper accumulated strain (∑Δε = 0.96–1.4) during HSRMF, under lower accumulated strain, the DRX is insufficient, while higher accumulated strain leads to abnormal grain growth. A double peak basal texture was achieved at lower pass strain (Δε = 0.1), which developed into titled basal texture, and the texture intensity increases with the pass strain. HSRMFed alloys with homogeneous fine DRX grain and relatively weak texture show high strength and excellent ductility, therefore, and it is inferred that the optimum pass strain and accumulated strain range are 0.16–0.35 and 0.96–1.4 respectively.

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“…Regarding MDF, the Mg alloys such as Mg-Al-Zn alloys [15], AZ series [16,17] (RE free Mg alloys) were still concerned via MDF. Wu et al [18] applied MDF on the ZK21 Mg alloy and due to the different strain rate applied experienced different twinning and DRX behavior. They attributed the island-like ultrafine DRX structure to the higher twinning density while grain coarsening to the adiabatic rise in temperature during forging.…”

Section: Introductionmentioning

confidence: 99%

Temperature Effects on the Microstructures of Mg–Gd–Y Alloy Processed by Multi-direction Impact Forging

Shah

Chen

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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A high strain rate multi-directional impact forging (MDIF) was applied to a solutionized Mg-Gd-Y-Zr alloy in the temperature range of 350-500 °C. Results demonstrate that the dominant deformation mode is twinning at a temperature below 400 °C, whereas at a medium temperature of 450 °C considerable continuous dynamic recrystallization was promoted by {10-12} extension twins. At a higher temperature of 500 °C, twinning activation was suppressed. New DRX grains were observed but their sizes were much bigger than those resulting from the MDIFed 50 passes at 450 °C, which are ascribed to the larger grain boundary mobility and atomic diffusion at 500 °C. Moreover, a non-basal weak texture was gained afterward MDIF at each temperature, which is credited to the MDIF process and the minor strain applied in each pass.

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Microstructure and mechanical properties of ZK21 magnesium alloy fabricated by multiple forging at different strain rates

Cited by 29 publications

References 25 publications

Microstructure, Texture and Mechanical Properties of AZ31 Magnesium Alloy Fabricated by High Strain Rate Biaxial Forging

Microstructure, Texture and Mechanical Properties of AZ31 Magnesium Alloy Fabricated by High Strain Rate Biaxial Forging

Effect of Pass Strain on the Microstructure, Texture and Mechanical Properties of AZ31 Magnesium Alloy Fabricated by High Strain Rate Multiple Forging

Temperature Effects on the Microstructures of Mg–Gd–Y Alloy Processed by Multi-direction Impact Forging

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