Static recrystallization behavior of multi-directional impact forged Mg-Gd-Y-Zr alloy

Shah, S.S.A.; Wu, Di; Chen, R.S.; Song, Guowen

doi:10.1016/j.jallcom.2019.07.086

Cited by 19 publications

(6 citation statements)

References 53 publications

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“…Numerous studies involving the evolution of the microstructure and texture of Mgbased alloys during thermo-mechanical processing and subsequent annealing treatments are reported in the literature [13,20,[27][28][29][30][31][32][33][34][35][36][37][38][39][40]. However, the mechanisms responsible for microstructure and texture evolution during deformation processing and recrystallization treatment are not well understood, and some reports provide controversial results.…”

Section: Introductionmentioning

confidence: 99%

On the evolution of microstructure, texture and corrosion behavior of a hot-rolled and annealed AZ31 alloy

Tighiouaret

Hanna

Azzeddine

et al. 2021

Materials Chemistry and Physics

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The microstructure and texture evolution of an AZ31 alloy were investigated after hot rolling and subsequent annealing using electron backscatter diffraction (EBSD). First, the alloy was hot-rolled at 350 °C up to low, medium and high strain (20, 50 and 85% of thickness reduction, respectively). The alloy samples where then annealed at 350 °C for 2, 10 and 60 minutes. The effect of strain level and annealing on corrosion behavior in seawater was also evaluated using electrochemical tests. At low strain, the microstructure was characterised by the absence of twinning, mainly due to the prior thermo-mechanical history of the as-received alloy. However, various modes of twinning were observed at medium strain. At high strain, the dynamic recrystallization process resulted in a microstructure with a typical basal texture. The results demonstrate that twins are responsible for the deviation of {0002} basal poles from normal towards the transversal direction. Annealing at 350°C for up to 60 min led to normal grain growth in all the samples. In medium and highly strained samples, the deformation texture was retained, while the low strain sample underwent noticeable changes due to the absence of dynamic recrystallization. A synergetic effect of grain refinement and texture weakening was responsible for the alloy's enhanced corrosion resistance.

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Section: Introductionmentioning

confidence: 99%

On the evolution of microstructure, texture and corrosion behavior of a hot-rolled and annealed AZ31 alloy

Tighiouaret

Hanna

Azzeddine

et al. 2021

Materials Chemistry and Physics

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“…S.S.A. et al [22] have identified them as β-phases (Mg24(Gd, Y)5). After homogenized at 520 • C for 16 h, the eutectic β-phase almost completely dissolved into the matrix (Figure 2b).…”

Section: Evolution Of Microstructurementioning

confidence: 99%

Microstructure and Texture Evolution of Mg-Gd-Y-Zr Alloy during Reciprocating Upsetting-Extrusion

Jia

et al. 2020

Materials

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Reciprocating Upsetting-Extrusion (RUE) deformation process can significantly refine the grains size and weaken the basal plane texture by applying a large cumulative strain to the alloy, which is of great significance to weaken the anisotropy of magnesium (Mg) alloys and increase the application range. In this paper, the Mg-8.27Gd-3.18Y-0.43Zr (wt %) alloy was subjected to isothermal multi-passes RUE. The microstructure and texture evolution, crystal orientation-dependent deformation mechanism of the alloy after deformation were investigated. The results clearly show that with the increase of RUE process, the grains are significantly refined through continuous dynamic recrystallization (CDRX) and discontinuous dynamic recrystallization (DDRX) mechanisms, the uniformity of the microstructure is improved, and the texture intensity is reduced. At the same time, a large number of particle phases are dynamically precipitated during the deformation process, promoting grain refinement by the particle-stimulated nucleation (PSN) mechanism. The typical [10-10] fiber texture is produced after one pass due to the basal plane of the deformed grains with a relatively high proportion is gradually parallel to the ED during extrusion process. However, the texture concentration is reduced compared with the traditional extrusion deformation, indicating that the upsetting deformation has a certain delay effect on the subsequent extrusion texture generation. After three or four passes deformation, the grain orientation is randomized due to the continuous progress of the dynamic recrystallization process.

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“…Li et al [ 11 ] produced an AZ31 alloy by rapid uniaxial forging and studied the microstructure evolution; they found that the formation of complex twins is a main reason for the decline of stored energy for grain refinement. 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: 99%

“…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%

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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Static recrystallization behavior of multi-directional impact forged Mg-Gd-Y-Zr alloy

Cited by 19 publications

References 53 publications

On the evolution of microstructure, texture and corrosion behavior of a hot-rolled and annealed AZ31 alloy

On the evolution of microstructure, texture and corrosion behavior of a hot-rolled and annealed AZ31 alloy

Microstructure and Texture Evolution of Mg-Gd-Y-Zr Alloy during Reciprocating Upsetting-Extrusion

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

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