Grain refinement and reduced yield asymmetry of extruded Mg–5Sn–1Zn alloy by Al addition

Kim, Peter Beomcheol; Baek, Soo-Min; Jeong, Hu Young; Lee, Jung Gu

doi:10.1016/j.jallcom.2015.11.133

Cited by 32 publications

(14 citation statements)

References 32 publications

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“…The microstructures (texture and grain size), tensile and compressive properties, and formability of these alloys are provided in Tables VI-VIII. [271][272][273][274][275][276][277] Since these alloys are less extensively studied, this section will be focused on a brief review of microstructures of the alloys based on the Mg-Mn and Mg-Li systems.…”

Section: Other Alloysmentioning

confidence: 99%

Microstructure, Deformation, and Property of Wrought Magnesium Alloys

Nie

Shin

Zeng

2020

Metall Mater Trans A

138

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Pure magnesium (Mg) develops a strong basal texture after conventional processing of hot rolling or extrusion. Consequently, it exhibits anisotropic mechanical properties and is difficult to form at room temperature. Adding appropriate alloying elements can weaken the basal texture or even change it, but the improvement in formability and mechanical properties is still far from expectations. Over the past 20 years, considerable efforts have been made and significant progress has been made on wrought Mg alloys at the fundamental and technological levels. At the fundamental level, textures formed in sheets and extrusions of different alloy compositions and produced under different strain paths or thermomechanical processing conditions are relatively well established, with the assistance of the advanced characterization technique of electron backscatter diffraction. At the technological level, room temperature formability of sheet has been significantly improved, and tension-compression yield asymmetry of extrusion is also remarkably reduced or eliminated. This paper starts with an overview of dislocations, stacking faults and twins, and deformation of single crystals of pure Mg along different orientations and under different loading conditions, followed by a review of microstructure (texture and grain size) and deformation of polycrystalline pure Mg with different textures, grain sizes, and loading conditions. With this information as a base, texture, grain size, and deformation of polycrystalline Mg alloy sheets and extrusions produced under different processing conditions are systematically examined and compared. Remaining and emerging scientific and technology issues are then highlighted and discussed in the context of texture and grain size. The need for better-resolution diffraction and spectroscopy techniques is also discussed in the relationship between texture change and grain boundary solute segregation.

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Section: Other Alloysmentioning

confidence: 99%

Microstructure, Deformation, and Property of Wrought Magnesium Alloys

Nie

Shin

Zeng

2020

Metall Mater Trans A

138

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“…These fine particles are Mg 2 Sn precipitates formed during hot rolling through dynamic precipitation. The previous studies [ 15 , 37 , 38 ] demonstrate that plastic deformation can induce the dynamic precipitation of Mg 2 Sn phase. Our observation is consistent with previous studies [ 15 , 37 , 38 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of Hot Rolling on the Microstructure and Mechanical Performance of a Mg-5Sn Alloy

et al. 2022

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A Mg-5Sn alloy was hot rolled at 380 °C with three different rolling reductions (30%, 50%, and 70%), and its effect on the microstructure and mechanical performance was examined. Grain size decreases, whereas the area fraction of Mg2Sn particles and dislocation density increase with the increase in rolling reduction. Therefore, the yield strength (YS) and ultimate tensile strength (UTS) exhibit an ascending trend, whereas the elongation (EL) shows a descending trend with increasing rolling reduction. The alloy hot rolled for 70% possesses a high strength of 310 MPa and an EL of 8.4%. The strength enhancement is mainly ascribed to precipitation strengthening, grain refinement strengthening, and dislocation strengthening.

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“…Thus, the un-DRXed grains were mainly observed in as-extruded Mg-6Sn and Mg-6Sn-2Zn alloys with more Mg 2 Sn precipitates. Second, the precipitates can suppress the growth of DRXed grains, since the plastic deformation introduces a mass of dislocations, where the precipitates tend to nucleate at [ 22 , 23 ]. Considering the two aspects of the Mg 2 Sn phase, the less un-DRX grains and larger DRX grains in the as-extruded Mg-6Sn-2Zn-1Ca alloy can be explained.…”

Section: Discussionmentioning

confidence: 99%

Effect of Zn and Ca Addition on Microstructure and Strength at Room Temperature of As-Cast and As-Extruded Mg-Sn Alloys

et al. 2018

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In this study, the effect of Zn and Ca addition on microstructure and strength at room temperature of Mg-Sn alloys was investigated by comparison of Mg-6Sn, Mg-6Sn-2Zn, and Mg-6Sn-2Zn-1Ca alloys in as-cast and as-extruded states. In the as-cast samples, α-Mg and Mg2Sn phases were the main phases of Mg-6Sn and Mg-6Sn-2Zn alloys, while the CaMgSn phase was formed in Mg-6Sn-2Zn-1Ca alloy due to the addition of the Ca element. Mg2Sn phase dissolved into the matrix during homogenization while CaMgSn phase remained. Incomplete dynamic recrystallization (DRX) took place in these alloys during hot extrusion. Fine Mg2Sn precipitates were observed in α-Mg matrix of as-extruded samples. Zn showed little influence on microstructure, whereas Ca reduced the volume fraction of un-DRXed grains and increased the size of DRXed grains. As-extruded Mg-Sn alloys exhibited typical fiber texture. The strength at room temperature of Mg-Sn alloys improved significantly after hot extrusion. The addition of Zn element was beneficial to the strength at room temperature of the Mg-6Sn alloy, while the further addition of Ca element was harmful to the strength. Among these alloys, the Mg-6Sn-2Zn alloy exhibited the best strength at room temperature in both as-cast and as-extruded states.

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Grain refinement and reduced yield asymmetry of extruded Mg–5Sn–1Zn alloy by Al addition

Cited by 32 publications

References 32 publications

Microstructure, Deformation, and Property of Wrought Magnesium Alloys

Microstructure, Deformation, and Property of Wrought Magnesium Alloys

Effect of Hot Rolling on the Microstructure and Mechanical Performance of a Mg-5Sn Alloy

Effect of Zn and Ca Addition on Microstructure and Strength at Room Temperature of As-Cast and As-Extruded Mg-Sn Alloys

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