Ultra-high strength Mg-9Gd-4Y-0.5Zr alloy with bi-modal structure processed by traditional extrusion

Shah, S.S.A.; Wu, Deliang; Chen, R.S.; Du, Xueyan; Hu, Nan; Zhang, Y. F.

doi:10.1007/s12540-016-6325-x

Cited by 33 publications

(3 citation statements)

References 27 publications

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“…In recent decades, newly developed Mg-Gd-Y alloys have received extensive interests due to their ultrahigh strength both at room and elevated temperatures [1][2][3], better creep resistance than WE54 alloy [4] and even being better than some conventional Al alloys [5]. However, most of these researches mainly focus on extrusion [2,6] and rolling processes [7,8].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Recrystallization and Texture Evolution of GW94 Mg Alloy During Multi- and Unidirectional Impact Forging

Shah

Jiang

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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Multi-and unidirectional impact forgings were successfully applied to a (GW94) Mg-RE alloy. The microstructure and texture evolution were investigated systematically. The obtained results indicated that during unidirectional impact forging, a bimodal chain deform microstructure was sustained till last forging pass, whereas {10-12} extension twins-assisted continuous dynamic recrystallization took place during the multidirectional impact forging (MDIF). The coalescence and intersection of {10-12} extension twins during MDIF efficiently refined the original coarse grains and led to an almost recrystallized homogeneous microstructure. The texture analysis demonstrated that unidirectional impact forging yielded out the strong basal texture; however, MDIF resulted in non-basal texture, which was attributed to the cooperative effects of continuous DRX, twinning, and MDIF itself during the deformation process.

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Section: Introductionmentioning

confidence: 99%

Dynamic Recrystallization and Texture Evolution of GW94 Mg Alloy During Multi- and Unidirectional Impact Forging

Shah

Jiang

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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“…The ultimate tensile strength (UTS) and tensile yield strength (TYS) of Mg-7Gd-5Y (wt.%) alloy at room temperature reached 258 MPa and 167 MPa [ 21 ]. The Mg-9Gd-4Y-0.5Zr alloy prepared by Hong et al [ 22 ] exhibited excellent mechanical properties, and its UTS, TYS and elongation (EL) reached 508 MPa, 400 MPa and 8.0%, respectively. Xu Chao et al [ 23 ] prepared Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr alloy with UTS of 505 MPa, TYS of 416 MPa and EL of 12.8% through extrusion technology.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Simulation of Punch Structure and Its Effect on Microstructure Evolution of Mg-Gd-Y-Zn-Zr Alloy via Rotary Extrusion Method

et al. 2022

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This article aims to explore the impact of the punch structure (number of grooves, area ratio of grooves, depth of grooves and flaring angle) on the loading, torque and metal flow during the rotary extrusion (RE) process via finite element simulation (FEM) software. In order to further verify the simulation results, physical experiments were carried out and the microstructure of Mg-Gd-Y-Zn-Zr alloy after RE deformation was characterized and analyzed. The FEM results indicated that increasing the groove number will increase the amount of shear deformation and promote the metal at the bottom of the punch to flow rapidly to the cylinder wall. The increase in the groove depth would continue to reduce the forming load and increase the strain. However, if the groove depth exceeded 6 mm, an excessive flow-velocity difference would be formed, resulting in the formation of folding defects. The time of metal flow from the bottom of the punch to the cylinder wall would be shortened with the increase in flaring angle. Therefore, a groove number of 8, an area ratio of 64.49%, a groove depth of 6 mm and a flaring angle ranging from 7°to 9°were the optimal parameters of the punch structure to form the Mg-Gd-Y-Zn-Zr cylindrical parts via the RE technique. In addition, the cylinder parts could be formed with good quality according to the optimized FEM results. The cylinder wall from inner region to outer region exhibited gradient microstructure owing to the different metal flow and strain during the RE process.

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“…In the recent decade, Mg alloys containing Gd and Y specifically (Mg-Gd-Y) have attracted numerous research interests [5,6], since they possess high strength at the room as well as at ambient temperatures and demonstrate good creep resistance [7,8]. To understand their microstructure evolution, several investigations were reported on dynamic recrystallization (DRX) behavior via extrusion [7,9] rolling [10,11], and compression [12] processes.…”

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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Ultra-high strength Mg-9Gd-4Y-0.5Zr alloy with bi-modal structure processed by traditional extrusion

Cited by 33 publications

References 27 publications

Dynamic Recrystallization and Texture Evolution of GW94 Mg Alloy During Multi- and Unidirectional Impact Forging

Dynamic Recrystallization and Texture Evolution of GW94 Mg Alloy During Multi- and Unidirectional Impact Forging

Finite Element Simulation of Punch Structure and Its Effect on Microstructure Evolution of Mg-Gd-Y-Zn-Zr Alloy via Rotary Extrusion Method

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

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