Microstructure evolution of Mg–14% Li–1% Al alloy during the process of equal channel angular pressing

Liu, Taoran; Sheng, Wu; Li, S.X.; Li, P.J.

doi:10.1016/j.msea.2007.01.108

Cited by 81 publications

(46 citation statements)

References 5 publications

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“…The mixed materials were ball-milled up to 30 h with several interruptions to open the vial and take out a small portion of particles for analysis. Samples were collected at shorter milling times (2,10,20, and 30 h), so that the evolution of the particles during milling could be followed.…”

Section: Materials and Milling Proceduresmentioning

confidence: 99%

“…Mg-Li based alloys and composites, known as the lightest metallic structural materials, have great potential for use not only in aerospace and military but also in automobiles and electrical appliances, due to their attractive features of high values of specific strength, specific modulus, and electromagnetic shielding properties [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preparation and surface modification of submicron YAl2 particles by mixed milling with magnesium for fabricating YAl2p/MgLiAl composites

Zhang¹,

Wu²,

Sha³

et al. 2014

Powder Technology

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Section: Materials and Milling Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and surface modification of submicron YAl2 particles by mixed milling with magnesium for fabricating YAl2p/MgLiAl composites

Zhang¹,

Wu²,

Sha³

et al. 2014

Powder Technology

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“…The addition of Al in Mg-Li alloys leads to the improvement of strength and the slight increase in density, but it causes the reduction of elongation. When the addition is higher than 6 mass%, the deterioration of elongation is severe [8][9][10]. Alloying magnesium with rare earth elements is used to develop light construction alloys for the applications at elevated and high temperatures and improve corrosion resistance and improve creep resistance.…”

Section: Introductionmentioning

confidence: 99%

Refinement effect of RE in light weight Mg–Li–Al alloys

Król

Staszuk

Mikuszewski

et al. 2018

J Therm Anal Calorim

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The effect of 2 mass% rare earth elements (RE) as in mischmetal state on the structure, thermal behaviour and mechanical properties of Mg-xLi-4Al (x = 4, 8 and 12 by mass percentage). The thermo-derivative analysis was implemented using the UMSA platform (Universal Metallurgical Simulator and Analyzer) with cooling rate approx. & 0.6°C s -1 that correspond to natural cooling. Microstructural evaluations were identified by X-ray diffraction, scanning electron microscopy, light microscope and energy-dispersive X-ray spectroscopy. Obtained results from the thermal derivative analysis allowed determining the solidification pathways for Mg-Li-Al-RE alloy. The addition of grain refinement causes changes in crystallisation process. The addition of RE elements affected an enhancement in mechanical properties, which was associated with the development of intermetallic compounds; the maximum increases in hardness at level 240% was observed for single a-phase alloy and at level 19% for a ? b alloy.

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“…The magnesium-8 wt% lithium alloy was reported in [4] to consist of hcp (α) and bcc (β) phases, with the α phase appearing as plates in the β matrix. A near Burgers orientation relationship was observed between the two phases, i.e., [0001] α [0−11]β, and (−100)α (−211)β. Two-phase Mg-Li-Al alloy processed by conventional extrusion followed by equal channel angular pressing (ECAP) at room temperature (RT) showed that the grains of the β phase matrix were sub- * corresponding author; e-mail: stantially refined, with the mean size decreasing from 60 µm to 200 nm [4,5]. Additionally, the α precipitates, embedded in the β grains and the ternary MgLiAl 2 phase coexisting with the α precipitates were homogenized by ECAP processing.…”

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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Microstructure evolution of Mg–14% Li–1% Al alloy during the process of equal channel angular pressing

Cited by 81 publications

References 5 publications

Preparation and surface modification of submicron YAl2 particles by mixed milling with magnesium for fabricating YAl2p/MgLiAl composites

Preparation and surface modification of submicron YAl2 particles by mixed milling with magnesium for fabricating YAl2p/MgLiAl composites

Refinement effect of RE in light weight Mg–Li–Al alloys

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

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