Dynamic recrystallization behavior of Gd-containing Mg alloy under torsion deformation

Yu, Jianmin; Zhang, Zhimin; Xu, Ping; Dong, Beibei; Wang, Qiang; Meng, Ming; Hao, Hongyuan; Li, Xubin; Yin, Xu

doi:10.1016/j.jallcom.2019.01.330

Cited by 44 publications

(16 citation statements)

References 23 publications

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“…For increasing the strength and corrosion of magnesium alloys, grain refinement and precipitation strengthening, two important strengthening techniques during the deformation of magnesium alloy, are usually used. Based on the characteristics of the low stacking faults (SFs) of magnesium alloys, dynamic recrystallization (DRX) generally takes place during hot deformation [20,21]. As an important dynamic softening and grain refinement mechanism, DRX plays an important role in controlling the deformation structure, strengthening the plastic forming ability, and improving the mechanical properties of magnesium alloys [22].…”

Section: Strengthening Mechanismmentioning

confidence: 99%

Research on AZ80 + 0.4%Ce (wt %) Ultra-Thin-Walled Tubes of Magnesium Alloys: The Forming Process, Microstructure Evolution and Mechanical Properties

Yan

Fang

Lian

et al. 2019

Metals

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Ultra-thin-walled tubes of magnesium alloys have received more and more attention in producing precision components for medical devices. Therefore, thin-walled tubes with high quality are desperately needed. In this study, the process of multi-pass variable wall thickness extrusion was carried out on an AZ80 + 0.4%Ce Mg alloy with up to five passes—one-pass backward extrusion and four-pass extension—to fabricate the seamless thin-walled tube with an inside diameter of 6.0 mm and a wall thickness of 0.6 mm. The average grain size decreased from 46.3 μm to 8.9 μm at the appropriate deformation temperature of 350 °C with the punch speed of 0.1 mm/s. X-ray diffraction (XRD), optical microscope (OM), scanning electron microscopy (SEM), and the Vickers hardness (HV) tester were utilized to study the phases, microstructure, and hardness evolution. It can be observed that low deformation temperatures (240 °C and 270 °C) and low strain (1 pass extrusion and 1 pass extension) lead to twins that occupy the grains to coordinate deformation, and a slip system was activated with the accumulation of strain. The results of the Vickers hardness test showed that twinning, precipitation of second phases, twinning dynamic recrystallization (TDRX), and work hardening were combined to change the hardness of tubes at 240 °C and 270 °C. The hardness reached 93 HV after the third pass extension without annealing at 350 °C.

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Section: Strengthening Mechanismmentioning

confidence: 99%

Research on AZ80 + 0.4%Ce (wt %) Ultra-Thin-Walled Tubes of Magnesium Alloys: The Forming Process, Microstructure Evolution and Mechanical Properties

Yan

Fang

Lian

et al. 2019

Metals

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“…At present, there are few studies on the torsional deformation behavior of rare earth magnesium alloys. Yu et al [19] reported that the stress–strain curve of Mg–11.95Gd–4.5Y–2Zn–0.37Zr alloy under hot torsion is similar to the stress–strain curve under thermocompression. Thermal torsion significantly reduces the texture under different deformation conditions.…”

Section: Introductionmentioning

confidence: 95%

“…Hagihara et al [12] confirmed that the (0001) [11,12,13,14,15,16,17,18,19,20] basal dislocation slip is the main deformation mode of the LPSO phase. Xu et al [10] reported that when the loading direction of compression deformation was basically parallel to the base plane of the LPSO phase, the base slip was difficult to open due to having a low Schmid factor.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Texture Evolution of Mg–Gd–Y–Zn–Zr Alloy by Compression–Torsion Deformation

Zhang

2019

Materials

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Mg–13Gd–4Y–2Zn–0.5Zr alloy was subjected to compression–torsion deformation at 450 °C with a strain rate of 0.001–0.5 s−1 using a Gleeble 3500 torsion unit. The effects of compression–torsion deformation on the microstructure and texture were studied, and the results showed that with the decrease of strain rate, the texture strength decreased, the number of dynamic precipitated particles increased, the degree of recrystallization increased, and the dynamic recrystallization mechanism changed from a continuous dynamic recrystallization mechanism to a continuous and discontinuous dynamic recrystallization mechanism. Along the direction of increasing radius, the degree of dynamic recrystallized grain (DRX) increased, the number of dynamic precipitated particles increased, and the texture strength slightly increased.

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“…The Sellars model [ 14 ] is a prediction model based on the Poliak–Jonas criterion, where the influence of temperature (T) and strain rate ( έ ) is considered, and the Zener–Hollomon ( Z ) parameter is used to obtain the ε c of DRX. The Sellars models of Mg-11.95Gd-4.5Y-2Zn-0.37Zr, AZ80, and AZ61 alloys were established by Yu [ 15 ], Su [ 16 ], and Wei [ 17 ], respectively.…”

Section: Introductionmentioning

confidence: 99%

Constitutive Equation and Hot Processing Map of Mg-16Al Magnesium Alloy Bars

Wang

et al. 2020

Materials

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A Gleeble-2000D thermal simulation machine was used to investigate the high-temperature hot compression deformation of an extruded Mg-16Al magnesium alloy under various strain rates (0.0001–0.1 s−1) and temperatures (523–673 K). Combined with the strain compensation Arrhenius equation and the Zener–Hollomon (Z) parameter, the constitutive equation of the alloy was constructed. The average deformation activation energy, Q, was 144 KJ/mol, and the strain hardening index (n ≈ 3) under different strain variables indicated that the thermal deformation mechanism was controlled by dislocation slip. The Mg-16Al alloy predicted by the Sellars model was characterized by a small dynamic recrystallization (DRX) critical strain, indicating that Mg17Al12 particles precipitated during the compression deformation promoted the nucleation of DRX. Hot processing maps of the alloy were established based on the dynamic material model. These maps indicated that the high Al content, precipitation of numerous Mg17Al12 phases, and generation of microcracks at low temperature and low strain rate led to an unstable flow of the alloy. The range of suitable hot working parameters of the experimental alloy was relatively small, i.e., the temperature range was 633–673 K, and the strain rate range was 0.001–0.1 s−1.

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Dynamic recrystallization behavior of Gd-containing Mg alloy under torsion deformation

Cited by 44 publications

References 23 publications

Research on AZ80 + 0.4%Ce (wt %) Ultra-Thin-Walled Tubes of Magnesium Alloys: The Forming Process, Microstructure Evolution and Mechanical Properties

Research on AZ80 + 0.4%Ce (wt %) Ultra-Thin-Walled Tubes of Magnesium Alloys: The Forming Process, Microstructure Evolution and Mechanical Properties

Microstructure and Texture Evolution of Mg–Gd–Y–Zn–Zr Alloy by Compression–Torsion Deformation

Constitutive Equation and Hot Processing Map of Mg-16Al Magnesium Alloy Bars

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