Deformation behaviour of Mg–Li–Al alloys

Drozd, Zdeněk; Trojanová, Zuzanka; Kúdela, S.

doi:10.1016/j.jallcom.2004.01.040

Cited by 139 publications

(61 citation statements)

References 15 publications

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“…In addition, Mg-Li alloys also show high specific stiffness, and high electrical and thermal conductivities. These alloys have attracted great attention due to their merits, especially in the fields of aerospace, aircraft, and weapon [1][2][3]. Despite that, poor corrosion resistance and mechanical properties of Mg-Li binary alloys limit their wide applications.…”

Section: Introductionmentioning

confidence: 99%

Study on the preparation of Mg–Li–Mn alloys by electrochemical codeposition from LiCl–KCl–MgCl2–MnCl2 molten salt

Zhang

Chen

et al. 2010

J Appl Electrochem

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This study presents a novel electrochemical study on the codeposition of Mg, Li, and Mn on a molybdenum electrode in LiCl-KCl-MgCl 2 -MnCl 2 melts at 893 K to form different phases Mg-Li-Mn alloys. Transient electrochemical techniques such as cyclic voltammetry, chronopotentiometry, and chronoamperometry have been used in order to investigate the codeposition behavior of Mg, Li, and Mn ions. The results obtained show that the potential of Li metal deposition, after the addition of MgCl 2 and MnCl 2 , is more positive than the one of Li metal deposition before the addition. The codeposition of Mg, Li, and Mn occurs at current densities lower than -1.43 A cm -2 in LiCl-KCl-MgCl 2 (8 wt%) melts containing 2 wt% MnCl 2 . The onset potential for the codeposition of Mg, Li, and Mn is -2.100 V. a, a ? b, and b phases Mg-Li-Mn alloys with different lithium and manganese contents were obtained via galvanostatic electrolysis from LiCl-KCl melts with different concentrations of MgCl 2 and MnCl 2 . The microstructures of typical a and b phases of Mg-Li-Mn alloys were characterized by X-ray diffraction (XRD), optical microscopy (OM), and scanning electron microscopy (SEM). The analysis of energy dispersive spectrometry (EDS) and EPMA area analysis showed that the elements of Mg and Mn distribute homogeneously in the Mg-Li-Mn alloys. The results of inductively coupled plasma analysis determined that the chemical compositions of Mg-Li-Mn alloys correspond with the phase structures of XRD patterns, and lithium and manganese contents of Mg-Li-Mn alloys depend on the concentrations of MgCl 2 and MnCl 2 .

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Section: Introductionmentioning

confidence: 99%

Study on the preparation of Mg–Li–Mn alloys by electrochemical codeposition from LiCl–KCl–MgCl2–MnCl2 molten salt

Zhang

Chen

et al. 2010

J Appl Electrochem

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“…One can see that the alloy 1 consists mostly of equiaxial hexagonal α grains of the average size of 60 µm. Based on X-ray diffraction, only hexagonal α grains were identified, although darker particles could be also seen, which the most probably resulted from the aluminum addition in the form of AlLi or Mg 17 Al 12 phases as suggested in [1]. The formation of MgLi 2 Al particles was also suggested to appear at higher Li content [9].…”

Section: Methodsmentioning

confidence: 92%

“…Precipitates and solute atoms are expected to be the main obstacles for dislocation motion at lower temperatures in hexagonal α type alloys. Cross slip causing stress drop with increasing temperature is presumably the dominant thermally activated mechanism at higher temperatures [1]. The addition of aluminum and copper to the α or β type Mg-Li alloys brings about the significant improvement of the age hardening effect in the α phase, although a limited data concerning the structure of precipitates was given [2,3].…”

Section: Introductionmentioning

confidence: 99%

Modification of Microstructure and Properties of Extruded Mg-Li-Al Alloys of α and α+ β Phase Composition using ECAP Processing

et al. 2017

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Two magnesium based alloys containing 4.5 wt% Li and 1.5 wt% Al (alloy 1) and 9 wt% Li and 1.5 wt% Al (alloy 2) were cast under argon atmosphere and hot extruded at 350• C. Microstructure of alloy 1 consisted of hexagonal α phase of average grain size 20 µm and small aluminum rich precipitates being the most probably AlLi2Mg phase. Alloy 2 in the extruded form consisted of lamellas of α + β phases of thickness 5-20 µm and length above 100 µm. Significant grain refinement down to about 2 µm was observed in one-phase hexagonal (hcp) alloy 1 after one pass of ECAP processing with helical component. Two-phase (hcp + bcc) alloy 2 showed higher non-homogeneity after the first equal channel angular pressing pass due to easier deformation of softer bcc phase, while both, α and β phases exhibited low angle grain boundaries. The hardness and the yield strength of the alloys were higher for alloy 1 (68 HV and 205 MPa, respectively) than those of alloy 2 (61 HV and 175 MPa). Subsequent equal channel angular pressing passes were performed at lower extrusion stress. The hardness of both alloys did not change significantly after subsequent equal channel angular pressing passes and revealed tendency to decrease. Two-phase alloy showed superplastic properties already after one equal channel angular pressing pass at 160• C with grain growth after superplastic tensile testing. Single phase hcp alloy did not show such properties after 1 pass, but after a few equal channel angular pressing passes it could be superplastically formed.

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“…Due to its strengthening effect, Al is the most commonly used alloy-forming element [20][21]. Addition of aluminum to Mg-Li alloys leads to appearing in hexagonal structure of phase δ, constituting solid solution Al in Mg having limited formability, of ductile phase λ being solid solution Al in Li having crystal body centered lattice and hard -enabling precipitation hardeningintercrystalline Al-Li compound of phase η with structure B2.…”

Section: Introductionmentioning

confidence: 99%

Registration of Melting and Crystallization Process of Ultra-light Weight MgLi12,5 Alloy with Use of ATND Method

Białobrzeski¹,

Pezda²

2012

Archives of Foundry Engineering

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To the main advantages of magnesium alloys belongs their low density, and just because of such property the alloys are used in aviation and rocket structures, and in all other applications, where mass of products have significant importance for conditions of their operation. To additional advantages of the magnesium alloys belongs good corrosion resistance, par with or even surpassing aluminum alloys. Magnesium is the lightest of all the engineering metals, having a density of 1.74 g/cm 3 . It is 35% lighter than aluminum (2.7 g/cm 3 ) and over four times lighter than steel (7.86 g/cm 3 ). The Mg-Li alloys belong to a light-weight metallic structural materials having mass density of 1.35-1.65 g/cm 3 , what means they are two times lighter than aluminum alloys. Such value of mass density means that density of these alloys is comparable with density of plastics used as structural materials, and therefore Mg-Li alloys belong to the lightest of all metal alloys. In the present paper are discussed melting and crystallization processes of ultra-light weight MgLi12,5 alloys recorded with use of ATND methods. Investigated magnesium alloy was produced in Krakow Foundry Research Institute on experimental stand to melting and casting of ultra-light weight alloys. Obtained test results in form of recorded curves from ATND methods have enabled determination of characteristic temperatures of phase transitions of the investigated alloy.

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Deformation behaviour of Mg–Li–Al alloys

Cited by 139 publications

References 15 publications

Study on the preparation of Mg–Li–Mn alloys by electrochemical codeposition from LiCl–KCl–MgCl2–MnCl2 molten salt

Study on the preparation of Mg–Li–Mn alloys by electrochemical codeposition from LiCl–KCl–MgCl2–MnCl2 molten salt

Modification of Microstructure and Properties of Extruded Mg-Li-Al Alloys of α and α+ β Phase Composition using ECAP Processing

Registration of Melting and Crystallization Process of Ultra-light Weight MgLi12,5 Alloy with Use of ATND Method

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