Effect of Ca addition on the plastic deformation behavior of extruded Mg-11Li-3Al-1Sn-0.4Mn alloy

Kim, Jeong Tae; Park, Gyu Hyeon; Kim, Young Seok; Hong, Seung Hyun; Park, Hae Jin; Suh, Jin-Yoo; Son, Hyeon-Taek; Lee, Min Ha; Park, Jin Man; Kim, Ki Buem

doi:10.1016/j.jallcom.2016.06.205

Cited by 19 publications

(4 citation statements)

References 33 publications

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“…Notably, as shown in Figure c, this tensile yield value for the 6 GPa–1000 Mg–8Li sample is not only far higher than those of Mg–Li binary alloys (100 ± 50 MPa) but also higher than those of multiple Mg–Li–X (X: other alloying elements) based alloys, even after different severe plastic deformation treatments, such as rolling, extrusion, − equal-channel angular pressing (ECAP), , and aging. , Additionally, both the specific yield strength and elongation are improved simultaneously in contrast to other commercial Mg or Al alloys (Figure d).…”

Section: Resultsmentioning

confidence: 90%

“…Microhardness (a) and tensile curves (b) of Mg–8Li alloys prepared under different conditions. (c) Yield strength and elongation to failure of various Mg–Li alloys and Mg–Li–X alloys (X: alloying elements) by different fabrication techniques, such as rolling, extrusion, − ECAP, , and aging. , (d) Comparison of specific yield strength between UHP Mg–8Li alloy and typical commercial Mg alloys.…”

Section: Resultsmentioning

confidence: 99%

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Achieving High Strength and Ductility in Magnesium Alloys via Densely Hierarchical Double Contraction Nanotwins

Xin

et al. 2017

Nano Lett.

123

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Light-weight magnesium alloys with high strength are especially desirable for the applications in transportation, aerospace, electronic components, and implants owing to their high stiffness, abundant raw materials, and environmental friendliness. Unfortunately, conventional strengthening methods mainly involve the formation of internal defects, in which particles and grain boundaries prohibit dislocation motion as well as compromise ductility invariably. Herein, we report a novel strategy for simultaneously achieving high specific yield strength (∼160 kN m kg) and good elongation (∼23.6%) in a duplex magnesium alloy containing 8 wt % lithium at room temperature, based on the introduction of densely hierarchical {101̅1}-{101̅1} double contraction nanotwins (DCTWs) and full-coherent hexagonal close-packed (hcp) particles in twin boundaries by ultrahigh pressure technique. These hierarchical nanoscaled DCTWs with stable interface characteristics not only bestow a large fraction of twin interface but also form interlaced continuous grids, hindering possible dislocation motions. Meanwhile, orderly aggregated particles offer supplemental pinning effect for overcoming latent softening roles of twin interface movement and detwinning process. The processes lead to a concomitant but unusual situation where double contraction twinning strengthens rather than weakens magnesium alloys. Those cutting-edge results provide underlying insights toward designing alternative and more innovative hcp-type structural materials with superior mechanical properties.

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Achieving High Strength and Ductility in Magnesium Alloys via Densely Hierarchical Double Contraction Nanotwins

Xin

et al. 2017

Nano Lett.

123

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“…However, there are still some shortcomings, mainly reflected in the relatively low strength and poor corrosion resistance, which restrict their wide application (Atrens et al, 2018;Atrens et al, 2015;Atrens et al, 2013;Song and Atrens, 2003;Song and Atrens, 1999). Alloying is a method to improve the mechanical properties and corrosion behavior of Mg alloys (Zhao et al, 2016;Kim et al, 2016). Al and rare earth elements are effective alloying elements that can improve the strength and corrosion behavior of Mg-Li alloys.…”

Section: Introductionmentioning

confidence: 99%

Effect of Al on the microstructure, corrosion behavior and mechanical properties of Mg-4Li

Zhang

Zhao

et al. 2020

ACMM

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Purpose This paper aims to investigate microstructure, corrosion behavior and mechanical properties of Mg-4Li and Mg-4Li-3Al. Design/methodology/approach The microstructure was characterized by using scanning electron microscopy and electron backscatter diffraction. The corrosion behaviors were measured by hydrogen evolution and potentiodynamic polarization tests. The mechanical properties were evaluated by tensile tests. Findings The addition of Al results in the precipitation of some Mg-Al phase and Al3Li phase particles, and the formation of some fine recrystallized grains. Originality/value Mg-4Li-3Al showed a higher corrosion rate than that of Mg-4Li, attributed to the precipitate particles in Mg-4Li-3Al causing microgalvanic corrosion and the change of grain orientation. The addition of 3 Wt. per cent Al increased the tensile strength by solid solution strengthening, precipitation strengthening, refinement strengthening and texture strengthening, whilst the elongation decreased by almost half.

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“…However, the binary Mg-Li alloys cannot meet the industrial strength requirements [10]. The addition of alloying elements to Mg-Li alloys was considered as an effective method to improve the strength of Mg-Li alloys due to its easy operation and cost-saving [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Grain Refinement Mechanism of the As-Cast and As-Extruded Mg–14Li Alloys with Al or Sn Addition

Zeng

Jiang

et al. 2017

Metals

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Abstract:The microstructures of the as-cast and as-extruded Mg-14 wt. % Li-1 wt. % Al (LA141) and Mg-14 wt. % Li-2 wt. % Sn (LT142) were observed by optical and scanning electron microscope (SEM), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The effects of Al and Sn on the grain refinement on the Mg-14Li alloy were investigated. In addition, the mechanism of grain refinement on the as-cast and as-extruded alloys was discussed from the view of the solute effect and heterogeneous nucleation effect via edge-to-edge matching model. The results showed that the average grain sizes of the as-cast LA141 and LT142 alloys were similar due to the close solute effect of 1.1 wt. % Al and 1.8 wt. % Sn, while, in the as-extruded alloys, the average grain size of LT142 was over two times finer than that of LA141. This was attributed to the reason that Li 2 MgSn particles can serve as heterogeneous nucleation sites for the β-Li matrix during the process of dynamic recrystallization (DRX), but LiMgAl 2 cannot serve the same way. Therefore, Sn can act as a more effective grain refiner for the Mg-14Li alloy compared to Al.

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Effect of Ca addition on the plastic deformation behavior of extruded Mg-11Li-3Al-1Sn-0.4Mn alloy

Cited by 19 publications

References 33 publications

Achieving High Strength and Ductility in Magnesium Alloys via Densely Hierarchical Double Contraction Nanotwins

Achieving High Strength and Ductility in Magnesium Alloys via Densely Hierarchical Double Contraction Nanotwins

Effect of Al on the microstructure, corrosion behavior and mechanical properties of Mg-4Li

Grain Refinement Mechanism of the As-Cast and As-Extruded Mg–14Li Alloys with Al or Sn Addition

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