Strengthening effect of nano and micro-sized precipitates in the hot-extruded Mg-5Sn-3Zn alloys with Ca addition

Chang, L.L.; Tang, Huaibin; Guo, Jingjie

doi:10.1016/j.jallcom.2017.01.274

Cited by 45 publications

(17 citation statements)

References 32 publications

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“…As shown in Figure 5 b,d,f, dense precipitates were observed in the α-Mg matrix in the as-extruded Mg-Sn alloys. According to Chang et al [ 13 ], these fine precipitates were probably of the Mg 2 Sn phase, which form dynamically during hot extrusion. Furthermore, as seen in Figure 5 f, the needle-like CaMgSn phase in the as-homogenized Mg-6Sn-2Zn-1Ca alloy was broken into particles and distributed along the extrusion direction.…”

Section: Resultsmentioning

confidence: 99%

“…While Zn addition increases, the secondary phase composition becomes sensitive to the ratio of Zn/Sn. With a Zn/Sn ratio of 0.6, (α-Mg + Mg 4 Zn 7 ) eutectic phase was observed in as-cast Mg-5Sn-3Zn (wt %) alloy [ 13 ]. However, in this study, the Zn/Sn ratio is too low to form Mg 4 Zn 7 and no (α-Mg + Mg 4 Zn 7 ) eutectic phase as found.…”

Section: Discussionmentioning

confidence: 99%

“…Though the multiple alloying of Ca and Zn was beneficial to elongation, the strength was reduced. However, Chang et al [ 13 ] found the addition of Ca into Mg-Sn-Zn alloy improved the strength and ductility simultaneously. Therefore, the effect of Ca and Zn elements on strength at room temperature of Mg-Sn alloys is not clear and needs to be further studied.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…With the consumption of Al atoms, the subcooling zone of the components appears in the interface front. The appearance of the component supercooled zone causes the primary Al 3 Fe phase to be wrapped by post-nucleated Fe-rich phases before it grows [ 30 ]. In contrast, the appearance of the component supercooled zone also causes dendrite fusion, separation and proliferation of Al 3 Fe.…”

Section: Discussionmentioning

confidence: 99%

“…The plastic deformation of Al alloys is controlled by dislocation slip [ 44 ]. However, the hard Al 3 Fe phase can prevent the movement of dislocation and the slipping of grain boundaries, which lead to the phenomenon of stress focus produced at the Al 3 Fe/Al matrix interface and inconsistent deformation [ 30 ]. As the deformation progresses, the stress concentration and uncoordinated deformation accumulate continuously.…”

Section: Discussionmentioning

confidence: 99%

Effect of Zr Microalloying on the Microstructures and Strengthening Mechanism of As-Cast Al-Fe-Zr Alloys

Guan

Zhao

et al. 2020

Materials

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The microstructure and mechanical properties of Al-0.35Fe alloys with a series of different zirconium (Zr) additions from 0.1 to 0.4% are investigated by optical microscopy, scanning electron microscopy, transmission electron microscopy and tensile testing. The as-cast structure of the alloys varies with the Zr content. When the content of Zr is 0.1%, Zr dissolves into the aluminum (Al) matrix completely and iron (Fe) concentrates along the boundary in a network of eutectic Al3Fe. With the increase in Zr content to 0.2% and above, nanoscale Al3Zr particles appear in the alloy. With the Zr content increasing from 0.1 to 0.4%, the grain size of the Al matrix decreases from 73 to 23 μm. The morphology of the eutectic Al3Fe phase changes from short rod-like to an agglomerated structure consisting of finer and shorter rod-like shapes. The tensile and yield strengths increase while the total elongation decreases with increasing Zr content. The strengthening mechanism of the alloy can be attributed to the combination of fine-grain, solution and second-phase strengthening.

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Microstructure and Mechanical Properties of Extruded Mg-7Sn-5Zn-xAl (x = 0, 1, 2 and 3 wt.%) Alloy

Jiang

et al. 2019

J. of Materi Eng and Perform

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Strengthening effect of nano and micro-sized precipitates in the hot-extruded Mg-5Sn-3Zn alloys with Ca addition

Cited by 45 publications

References 32 publications

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

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

Effect of Zr Microalloying on the Microstructures and Strengthening Mechanism of As-Cast Al-Fe-Zr Alloys

Microstructure and Mechanical Properties of Extruded Mg-7Sn-5Zn-xAl (x = 0, 1, 2 and 3 wt.%) Alloy

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