Hot compression behavior of the Mg-Gd-Y-Zn-Zr alloy filled with intragranular long-period stacking ordered phases

Zhou, Xiaojie; Liu, Chuming; Gao, Yonghao; Jiang, Shunong; Liu, Wenhui; Lu, Liwei

doi:10.1016/j.jallcom.2017.07.088

Cited by 72 publications

(18 citation statements)

References 42 publications

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“…Compared with pre‐extruded alloys, the average value of the Schmid factor of the PEF alloy increased because more DRX grains led to a higher Schmid factor and texture intensity decreased during the forging process. [ 28 ] The progressive law of the average value of the Schmid factor of the PEF Mg−Al−Zn−Ce alloys was different from that of the extruded alloys. This may have been due to the fact that when the pre‐extruded alloys had a high density texture, the degree of difficulty of the slip system required to initiate deformation in a certain direction during the plastic deformation process was different, which led to the difference in strength and plasticity.…”

Section: Resultsmentioning

confidence: 99%

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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Section: Resultsmentioning

confidence: 99%

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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“…Many oriented fine-lamellar phases were formed inside the grains, and some particle phases were found at the triple points of DRXed grain boundaries, indicating that dynamic precipitation happened during RUE processing. These fine-lamellar phases and particle phases were the 14H-LPSO and Mg 5 (Gd,Y,Zn), respectively [26]. Meanwhile, it could also be seen that some interdendritic block-shaped phases were broken up and heterogeneously distributed around the grain boundary.…”

Section: Resultsmentioning

confidence: 99%

Effects of Repetitive Upsetting Extrusion on the Microstructure and Texture of GWZK124 Alloy under Different Starting Temperatures

Zhang

Meng

et al. 2019

Materials

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The effects of repetitive upsetting extrusion under different starting temperatures on the microstructure and texture of GWZK124 alloy were investigated. The results clearly showed that the particles and second phases induced dynamic recrystallization (DRX), which can be explained by the particle-stimulated nucleation (PSN) mechanism. It was shown that grain refinement during repetitive upsetting extrusion (RUE) is dominated by a complicated combination of continuous dynamic recrystallization and discontinuous dynamic recrystallization. The RUEed alloys under different starting temperatures exhibited a bimodal microstructure comprising fine DRXed grains with weak texture and coarse deformed grains with strong texture. The DRXed grains could weaken the texture. As the RUE starting temperature decreased, the average grain size increased and the volume fraction of DRXed grains decreased.

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“…The microstructure of the as-cast Mg-13Gd-4Y-2Zn-0.6Zr alloy comprises of equiaxed a-Mg matrix with statistically average grain size of 76 lm, the eutectic Mg 3 (Gd,Y) phase, intragranular 14H-LPSO phase and interdendritic 18R-LPSO phase, as well as the precipitated Mg 5 (Gd,Y) 24 phase [28][29][30]. The intragranular thin-platelet lamellar structure can be observed, which precipitates from the a-Mg supersaturated solid solution at high temperatures [29]. The as-cast Mg-13Gd-4Y-2Zn-0.6Zr alloy was homogenized at 793 K for 16 h, followed by air cooling.…”

Section: Effect Of Passes On Microstructure Evolutionmentioning

confidence: 99%

Effects of Passes on Microstructure Evolution and Mechanical Properties of Mg–Gd–Y–Zn–Zr Alloy During Multidirectional Forging

Teng

Luo

2018

Acta Metall. Sin. (Engl. Lett.)

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The multidirectional forging (MDF) process was conducted at temperature of 753 K to optimize the mechanical properties of as-homogenized Mg-13Gd-4Y-2Zn-0.6Zr alloy containing long-period stacking ordered phase. The effects of MDF passes on microstructure evolution and mechanical properties were also investigated. The results show that both the volume fraction of dynamic recrystallization (DRX) grains and mechanical properties of the deformed alloy enhanced with MDF passes increasing till seven passes. The average grain size decreased from 76 to 2.24 lm after seven passes, while the average grain size increased to 7.12 lm after nine passes. The microstructure after seven passes demonstrated randomly oriented fine DRX grains and larger basal (0001)\11 20[ Schmid factor of 0.31. The superior mechanical properties at room temperature (RT) with ultimate tensile strength (UTS) of 416 MPa and fracture elongation of 4.12% can be obtained after seven passes. The mechanical properties at RT after nine passes are inferior to those after seven passes due to the coarsening of DRX grains, which can be ascribed to the static recovery resulting from the repeated heating at the interval of MDF passes. The elevated temperature mechanical properties of the deformed alloy after seven passes and nine passes were investigated. When test temperature was below 523 K, the elevated temperature tensile yield strength and UTS after seven passes are superior to those after nine passes, while they are inferior to that after nine passes as temperature exceeds 523 K.

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Hot compression behavior of the Mg-Gd-Y-Zn-Zr alloy filled with intragranular long-period stacking ordered phases

Cited by 72 publications

References 42 publications

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

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

Effects of Repetitive Upsetting Extrusion on the Microstructure and Texture of GWZK124 Alloy under Different Starting Temperatures

Effects of Passes on Microstructure Evolution and Mechanical Properties of Mg–Gd–Y–Zn–Zr Alloy During Multidirectional Forging

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