Effects of samarium content on microstructure and mechanical properties of Mg–0.5Zn–0.5Zr alloy

Guan, Kai; Meng, Fanzhi; Qin, Pengfei; Yang, Qiang; Zhang, Dongdong; Li, Baishun; Sun, Wei; Lv, Shasha; Huang, Yuanding; Hort, Norbert; Meng, Jian

doi:10.1016/j.jmst.2019.01.019

Cited by 66 publications

(9 citation statements)

References 42 publications

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“…Such a trend makes a positive condition for the grain refinement [32,33]. Simultaneously, since the equilibrium partition coefficient, K, of Y/Er and Zn solute elements is far less than one, solute atoms Y/Er, as well as Zn, would be enriched and aggregated at the solid–liquid interface during the solidification process, and such enrichment of solute atoms finally results in preferentially nucleate and formation of Mg 24 RE 5 and W intermetallic phases at GBs, which subsequently act as effective barriers to inhibit grain growth by limiting grain boundary migration [34,35].…”

Section: Discussionmentioning

confidence: 99%

The Effect of Y/Er and Zn Addition on the Microstructure and Mechanical Properties of Mg-11Li Alloy

Zhang

et al. 2019

Materials

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Although body-centered cubic (BCC) structural magnesium–lithium (Mg-Li) alloys have lower density and better formability than common hexagonal close-packed (HCP) Mg alloys, their applications remain limited due to their low strength. The purpose of this study is to investigate the effect of Y/Er and Zn addition on the microstructure and tensile properties of Mg-11Li alloy with a BCC structural matrix by comparing Mg-11Li, Mg-11Li-4Y-2Er-2Zn, and Mg-11Li-8Y-4Er-4Zn (wt %) alloys. The results indicate that the addition of Y/Er and Zn at a ratio of 3:1 cannot promote the formation of long-period stacking ordered structure in Mg-11Li alloy such as that in Mg-Y-Er-Zn alloys and the dominant intermetallic phases formed are BCC Mg24RE5 and face-centered cubic (FCC) Mg3RE2Zn3 phases. With an increase of the content of Y/Er and Zn in an as-cast alloy, the fraction of intermetallic particles increases and the grain size decreases. The addition of Y/Er, as well as Zn, dramatically promotes the refinement of dynamic recrystallization (DRX) during extrusion. The initial intermetallic phases induced by Y/Er and Zn addition are broken into relatively fine particles during extrusion, and this contributes to refining the dynamic recrystallized (DRXed) grains mainly by the particle stimulated nucleation mechanism. The as-extruded Mg-11Li-4Y-2Er-2Zn and Mg-11Li-8Y-4Er-4Zn alloys exhibit much higher tensile strength as compared with as-extruded Mg-11Li alloy, which is mainly ascribed to the refined DRXed grains and numerous dispersed intermetallic phase particles. It is suggested that further refinement of intermetallic particles in these extruded Mg-11Li-based alloys may lead to higher quality alloy materials with low density and excellent mechanical properties.

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Section: Discussionmentioning

confidence: 99%

The Effect of Y/Er and Zn Addition on the Microstructure and Mechanical Properties of Mg-11Li Alloy

Zhang

et al. 2019

Materials

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“…Adding rare earth elements to magnesium alloys can significantly refine the microstructure and effectively promote the formation of thermally stable particles, thereby improving the mechanical properties of magnesium alloys. [5][6][7] Because of the insufficient sliding system of the hexagonal close-packed (hcp) structure of magnesium alloys, the formability, ductility, and processability at room temperature are poor, which greatly limit the application of magnesium alloys. [3] Wrought magnesium alloys manufactured by processes such as extrusion, rolling, and forging usually show higher strength and ductility than as-cast alloys.…”

Section: Introductionmentioning

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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“…The Mg alloys are the environmentally-friendly structural materials in the 21st century due to their low density, high specific strength and stiffness, good workability and well recycling [1][2][3][4]. Accordingly, they are attractive in the application of automobile, aerospace, rail way and biomedicine [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Zn addition on the microstructures and mechanical behaviors of As-cast Mg-2.5Y-1Ce-0.5Mn alloy

Zhang

Sun

Liu

et al. 2020

Mater. Res. Express

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The effect of Zn addition on the microstructures and mechanical behaviors of as-cast Mg-2.5Y-1Ce-0.5Mn alloy was investigated. Microstructure observation demonstrated that with the addition of 1wt%, 3wt% and 5wt% Zn, the ternary phases of LPSO phase, LPSO phase +W-phase and W-phase +T-phase (Mg-Zn-Ce) are precipitated orderly, and the volume fraction of eutectic phases increases. The results of tensile tests demonstrated that with increasing Zn addition, the yield strength s YS ( )of as-cast alloys increases continuously while the ultimate tensile strength s UTS ( )and elongation d ( ) increase nonlinearly. Based on the analysis of microstructure, nanoindentation results and deformation surfaces, it found that the s YS is increased by the increased volume fraction of hard ternary phases. The largest d in 1wt% Zn alloy is contributed from the LPSO phase with an excellent plastic accommodation while the insufficient accommodated role of LPSO phase and the easily broken W-phase deteriorate the ductility of 3wt% Zn alloy. The hard and brittle T-phase also damages the ductility, while the fine grains contribute to the moderate elongation in 5wt% Zn alloy. The s UTS mainly arises from a sustainable increase of strain hardening ability after yielding that associated with both the high yielding point and excellent ductility.

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Effects of samarium content on microstructure and mechanical properties of Mg–0.5Zn–0.5Zr alloy

Cited by 66 publications

References 42 publications

The Effect of Y/Er and Zn Addition on the Microstructure and Mechanical Properties of Mg-11Li Alloy

The Effect of Y/Er and Zn Addition on the Microstructure and Mechanical Properties of Mg-11Li Alloy

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

Effect of Zn addition on the microstructures and mechanical behaviors of As-cast Mg-2.5Y-1Ce-0.5Mn alloy

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