Effect of icosahedral phase on the thermal stability and ageing response of a duplex structured Mg–Li alloy

Xu, Daokui; Wang, B.J.; Li, C.Q.; Zu, Tingting; Han, En‐Hou

doi:10.1016/j.matdes.2014.12.057

Cited by 67 publications

(22 citation statements)

References 30 publications

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“…Thus, it demonstrates that the addition of Zn and Y in Mg-6%Li-6%Zn-1.2%Y alloy can effectively impede the phase transformation from β-Li to α-Mg and retard the grain growth. Similar results have also been reported in previous work1416.…”

Section: Resultssupporting

confidence: 93%

“…In the previous work, Xu et al . reported that the finely dispersed particles were MgLiZn particles and could quickly precipitate and coarsen in β-Li phases during artificial ageing at 200 °C14. Moreover, it demonstrated that the I-phase/α-Mg and W-phase/α-Mg eutectic pockets could be easily broken during extrusion process216.…”

Section: Resultsmentioning

confidence: 95%

“…However, compared with the traditional Mg alloys, the mechanical strength of Mg-Li alloys is much lower even after severe plastic deformation (e.g. hot extrusion or equal channel angular extrusion)12141516. Moreover, their thermal stability is poor17181920, which is mainly ascribed to the early precipitation of phase particles during ageing process17181920212223.…”

mentioning

confidence: 99%

“…found that the needle-shaped α-Mg particles could precipitate in β-Li phases of Mg-8%Li-3%Al-1%Y alloy during homogenization treatment at elevated temperature18. In addition, the metastable phase MgLi 2 X (X is Al or Zn) in the duplex Mg-Li based alloys could easily transform into soft equilibrium phase MgLiX during ageing process141920212223. Qu et al .…”

mentioning

confidence: 99%

“…Recently, Xu et al . reported that I-phase (Mg 3 Zn 6 Y, icosahedral quasicrystal structure) could be in-situ formed through adding Zn and Y and controlling the Zn/Y atomic ratio of 6 in duplex structured Mg-Li alloys, which improved their mechanical strength to a great degree2141516. Additionally, I-phase exhibits many attractive properties such as high hardness, thermal stability, high corrosion resistance, low coefficient of friction and low interfacial energy, etc 242526272829.…”

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confidence: 99%

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Natural ageing responses of duplex structured Mg-Li based alloys

Wang

et al. 2017

Sci Rep

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Natural ageing responses of duplex structured Mg-6%Li and Mg-6%Li-6%Zn-1.2%Y alloys have been investigated. Microstructural analyses revealed that the precipitation and coarsening process of α-Mg particles could occur in β-Li phases of both two alloys during ageing process. Since a certain amount of Mg atoms in β-Li phases were consumed for the precipitation of abundant tiny MgLiZn particles, the size of α-Mg precipitates in Mg-6%Li-6%Zn-1.2%Y alloy was relatively smaller than that in Mg-6%Li alloy. Micro hardness measurements demonstrated that with the ageing time increasing, the α-Mg phases in Mg-6%Li alloy could have a constant hardness value of 41 HV, but the contained β-Li phases exhibited a slight age-softening response. Compared with the Mg-6%Li alloy, the age-softening response of β-Li phases in Mg-6%Li-6%Zn-1.2%Y alloy was much more profound. Meanwhile, a normal age-hardening response of α-Mg phases was maintained. Tensile results indicated that obvious ageing-softening phenomenon in terms of macro tensile strength occurred in both two alloys. Failure analysis demonstrated that for the Mg-6%Li alloy, cracks were preferentially initiated at α-Mg/β-Li interfaces. For the Mg-6%Li-6%Zn-1.2%Y alloy, cracks occurred at both α-Mg/β-Li interfaces and slip bands in α-Mg and β-Li phases.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 95%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Natural ageing responses of duplex structured Mg-Li based alloys

Wang

et al. 2017

Sci Rep

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Effects of Al and Y Addition on Microstructures and Mechanical Properties of As‐Cast Mg–14Li Based Alloy

Gao

Liu

et al. 2018

Adv Eng Mater

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In this study, effects of Al and Y contents on microstructural evolutions and mechanical properties of the as‐cast Mg–14Li alloy are investigated. The results show that Mg–14Li–xAl (x = 1, 2, 3 wt%) alloys are characterized by predominantly single β–Li and MgLiAl2 phases. Slight refinement of β–Li grains is obtained with the increasing of Al content. The increased Al addition greatly improves the hardness, ultimate tensile strength, and yield strength of the Mg‐14 base alloy, accompanied by a significant reduction in ductility. Meanwhile, with addition of minor Y (0.5 wt%) addition leads to the introduction of homogeneous distribution of Al2Y particles in the Mg–14Li–3Al alloy, which plays a positive role in the strength enhancement. However, the uneven distribution of apparently coarsed Al2Y particles contributes to a significant reduction in tensile strength as the Y content is increased up to 1 wt%.

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A Novel Ordered B2 Particle Strengthened Mg–Li–Zn Alloy

Zhang

Sun

et al. 2022

Adv Eng Mater

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Mg–13Li–9Zn alloy is prepared by casting and hot rolling. The microstructure evolution and mechanical properties are systematically investigated by optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM), and tensile tests. A large number of B2 nanoparticles semicoherent with the matrix are uniformly dispersed within the grains of the as‐cast Mg–13Li–9Zn alloy, which increases the hardness by three times compared with that of the as‐cast Mg–13Li alloy. However, the continuously distributed MgLi2Zn phase at the grain boundary reduces the ability to resist tensile stress, resulting in intergranular fracture at the elastic deformation stage. After rolling, dynamic recrystallization occurs, and both the strength and ductility are improved. The B2 particles have good thermal stability and maintain a semicoherent relationship with the matrix during the hot rolling process. In addition, some spinodal decomposition zones are introduced into the matrix via the rolling process. The yield strength (YS) and elongation (EL) of the rolled alloy reach 280 MPa and 22%, respectively.

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Effect of icosahedral phase on the thermal stability and ageing response of a duplex structured Mg–Li alloy

Cited by 67 publications

References 30 publications

Natural ageing responses of duplex structured Mg-Li based alloys

Natural ageing responses of duplex structured Mg-Li based alloys

Effects of Al and Y Addition on Microstructures and Mechanical Properties of As‐Cast Mg–14Li Based Alloy

A Novel Ordered B2 Particle Strengthened Mg–Li–Zn Alloy

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