Strain induced transformation, dynamic recrystallization and texture evolution during hot compression of an extruded Mg-Gd-Y-Zn-Zr alloy

Esmaeilpour, H.; Zarei-Hanzaki, A.; Eftekhari, Niloofar; Abedi, H.R.; Ferdowsi, Mahmoud Reza Ghandehari

doi:10.1016/j.msea.2020.139021

Cited by 50 publications

(4 citation statements)

References 55 publications

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“…Gd solutes can effectively reduce the stacking fault energy of Mg alloys [38]. The smaller the stacking fault energy is, the higher stored energy can be during plastic deformation [39]. The high stored energy by Gd alloying could promote the nucleation rate and the number of nuclei to accelerate DRX [40].…”

Section: Mechanical Properties and Fracture Surfacesmentioning

confidence: 99%

Enhanced Mechanical Properties and Corrosion Resistance by Minor Gd Alloying with a Hot-Extruded Mg Alloy

Yao

Wang

Xiong

et al. 2022

J. of Materi Eng and Perform

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The microstructure, mechanical properties, and degradation behavior of as-extruded Mg-1.8Zn-0.5Zr-xGd alloys (x=0, 0.5, 1.0, 1.5, 2.0, 2.5 wt%) are investigated. During extrusion, dynamic recrystallization occurs in the alloy and the grain size gradually decreases with increasing Gd content. The mechanical properties and corrosion resistance of the alloys are significantly enhanced by Gd alloying.When the Gd content is 1.5wt%, nanoscale particles of (Mg, Zn) 3 Gd and Mg 2 Zn 11 phases that have a coherent interface with the matrix begin to precipitate out. Under the combined effect of solid solution strengthening, fine grain strengthening and precipitation strengthening, the alloys with 1.5-2.0wt% Gd have a combination of excellent mechanical properties and corrosion resistance. A three-stage corrosion mechanism, including sequential stages from hydroxidation, phosphatization and hydroxidation, to formation-dissolution dynamic equilibrium, is proposed through electrochemical measurements and corroded surface analyses. This extruded Mg-1.8Zn-0.5Zr-(1.5-2.0)Gd alloys can be regarded as the potential candidate for using as biodegradable magnesium implants.

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Section: Mechanical Properties and Fracture Surfacesmentioning

confidence: 99%

Enhanced Mechanical Properties and Corrosion Resistance by Minor Gd Alloying with a Hot-Extruded Mg Alloy

Yao

Wang

Xiong

et al. 2022

J. of Materi Eng and Perform

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“…More importantly, a non-basal texture component has been gradually formed, because the grain refinement is beneficial to the activation of prismatic or pyramidal slip systems. Furthermore, the particle stimulated nucleation (PSN) from dynamic precipitation of fine MgZn 2 phase favorably leads to more randomly oriented nuclei, which contributes to the texture weakening effect [38,39].…”

Section: Mechanisms Of Microstructure and Texture Evolutionmentioning

confidence: 99%

Simultaneously Enhanced Mechanical Properties and Damping Capacities of ZK60 Mg Alloys Processed by Multi-Directional Forging

Tong

Chu

Zou

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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In this study, the mechanical properties and damping capacities of cast Mg-5.5Zn-0.6Zr (weight percent, ZK60) alloys have been simultaneously improved by a facile multi-directional forging (MDF) processing, and the mechanisms of microstructure evolution and texture modification are systematically investigated. The activation of tension twinning occurs during the initial MDF stage, due to the coarse-grained structure of the as-cast alloy. With increasing MDF passes, the continuous dynamic recrystallization (CDRX) results in a fine equiaxed-grain structure. The typical non-basal texture is formed in the as-MDFed alloy for 6 passes, with the (0001) planes inclined 60°-70° to forged direction and 10°-20° to transverse direction, respectively. A good balance between the strength (~ 194.9 MPa) and ductility (~ 24.9%) has been achieved, which can be ascribed to the grain refinement, non-basal texture and fine precipitate particles. The damping capacity is remarkably improved after MDF processing, because the severe deformation increases the dislocation density, which effectively enlarges the sweep areas of mobile dislocations.

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“…When the alloy is continuously deformed, the texture will change significantly due to the formation of preferential orientation, especially in the Mg alloy with less slip system [31][32][33]. Figure 7 represents the basal pole figure (PF) and the corresponding inverse pole figure (IPF) of the RUEed alloy under different passes.…”

Section: Texture Evolutionmentioning

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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Strain induced transformation, dynamic recrystallization and texture evolution during hot compression of an extruded Mg-Gd-Y-Zn-Zr alloy

Cited by 50 publications

References 55 publications

Enhanced Mechanical Properties and Corrosion Resistance by Minor Gd Alloying with a Hot-Extruded Mg Alloy

Enhanced Mechanical Properties and Corrosion Resistance by Minor Gd Alloying with a Hot-Extruded Mg Alloy

Simultaneously Enhanced Mechanical Properties and Damping Capacities of ZK60 Mg Alloys Processed by Multi-Directional Forging

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

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