Al–Cu–Li and Al–Mg–Li alloys: Phase composition, texture, and anisotropy of mechanical properties (Review)

Betsofen, S. Ya.; Антипов, В.В.; Knyazev, M. I.

doi:10.1134/s0036029516040042

Cited by 65 publications

(21 citation statements)

References 27 publications

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“…The solution of Li element in Al matrix makes only a small degree of the solid solution strengthening, which is mainly created by the variation of the elastic modulus and size of the Li and Al atoms [66] . On the other hand, the main strengthening in Al-Li alloys is generally achieved from the existence of a huge volume fraction of the Al 3 Li

phase, which is the main reason for high elastic modulus observed in these alloys, since Al 3 Li itself has a large intrinsic modulus [2] , [3] , [9] , [66] . Strengthening by Al 3 Li is caused by several mechanisms such as coherency and surface hardening, modulus hardening and order hardening [67] .…”

Section: Strengthening Mechanisms Of Al-li Alloysmentioning

confidence: 99%

“…Recently, Al-Li alloys have gained attention for their use in weight and stiffness-critical structures used in aircraft, aerospace and military applications because they exhibit better properties, such as a low density and high specific strength, than those of commercial Al alloys [1] , [2] , [3] , [4] . The Improvements in density and specific strength are not only the factors of measuring the performance for aerospace materials.…”

Section: Introductionmentioning

confidence: 99%

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Strengthening mechanisms, deformation behavior, and anisotropic mechanical properties of Al-Li alloys: A review

El-Aty

Guo

et al. 2018

Journal of Advanced Research

475

124

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Section: Strengthening Mechanisms Of Al-li Alloysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strengthening mechanisms, deformation behavior, and anisotropic mechanical properties of Al-Li alloys: A review

El-Aty

Guo

et al. 2018

Journal of Advanced Research

475

124

View full text Add to dashboard Cite

show abstract

“…It has been known that the strengthening mechanism of Al-Li alloys is associated with the precipitation of the metastable ordered δ'-Al 3 Li phase, which has a L1 2 structure and forms as coherent spherical particles from the Al matrix [1][2][3][4][5][6]. It has been confirmed that δ'-Al 3 Li phase has a large intrinsic modulus, which could be the main reason of high elastic modulus in Al-Li alloys [7][8][9]. At the same time, one of the major problems associated with Al-Li alloys is the decreased ductility due to the presence of the shearable strengthening phase δ'-Al 3 Li [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A first-principles study on the site occupancy behavior of transition metals in L1₂-Al₃Li phase

Gao

Deng

Wen

et al. 2020

Mater. Res. Express

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The main strengthening mechanism in Al-Li alloys is generally achieved by the existence of a high volume fraction of the L1 2 -Al 3 Li precipitation from Al matrix. In this work, we do density functional theory(DFT) total energy calculations on the site occupancy behaviour of transition metals in L1 2 -Al 3 Li compound. The ground state properties of L1 2 -Al 3 Li, fcc-Al, and bcc-Li are determined and compared to the available literature data. The formation energies of intrinsic point defects in L1 2 -Al 3 Li phase as well as Al 3 LiX alloy formation energy are calculated and identified. We show that the Li antisite is preferential to from in the L1 2 -Al 3 Li phase. Finally, the site occupancy behaviour of transition metals in L1 2 -Al 3 Li as well as the solute atomic volume effect on the solute site preference and lattice expansion of the L1 2 -Al 3 Li have been studied, the later results can be used for an indirect estimation of the site substitution behaviour of the alloying elements in L1 2 -Al 3 Li phase.

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“…Creep Ageing Forming (CAF) is a metal forming technology developed for manufacturing large aluminum components in the aerospace industry [1]. In recent years, Al-Li alloys have attracted much attention because of low weight, high stiffness and high strength for their applications in aircraft, aerospace and military fields [2][3][4][5]. Combining creep aging with Al-Li alloy, it is necessary to explore the influence of different creep aging parameters on the forming of Al-Li alloy.…”

Section: Introductionmentioning

confidence: 99%

Study on Multi-Step Creep Aging Behavior of Al-Li-S4 Alloy

Xia

Zhan

et al. 2019

Metals

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Creep age forming (CAF) is a new technology developed for manufacturing large aluminum components in the aerospace industry. Aluminum–lithium alloys may be used in aerospace components because of their high modulus, specific strength and specific stiffness. Therefore, the creep deformation, mechanical properties and aging precipitation of Al-Li-S4 alloy under CAF conditions were studied. It was found that the creep behavior presents double steady state creep stages during the creep aging process. With the increase of stress level, the first steady creep rate increased, but the second steady creep rate was slightly reduced. Coincidentally, in the first steady state creep stage, the yield strength of the studied alloy also showed a slow increase stage. TEM observation showed that Al-Li-S4 alloy mainly contains two precipitation phases, T1 phase and θ’ phase. A few precipitates form during the first steady creep stage. Then, a lot of nucleation and growth of T1 phase resulted in rapid increase of yield strength. At the same time, the increase of stress level effectively inhibited the growth of T1 phase, which resulted in these strengthening phases being more uniform, and thus improved the mechanical properties of materials. On this basis, the relationship between the multi-step behaviors of creep, mechanical properties and aging precipitates are discussed. It is considered that the main reasons for the multi-step phenomenon of creep and mechanical properties are strongly related to the nucleation, growth and distribution of T1 phase.

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Al–Cu–Li and Al–Mg–Li alloys: Phase composition, texture, and anisotropy of mechanical properties (Review)

Cited by 65 publications

References 27 publications

Strengthening mechanisms, deformation behavior, and anisotropic mechanical properties of Al-Li alloys: A review

Strengthening mechanisms, deformation behavior, and anisotropic mechanical properties of Al-Li alloys: A review

A first-principles study on the site occupancy behavior of transition metals in L1₂-Al₃Li phase

Study on Multi-Step Creep Aging Behavior of Al-Li-S4 Alloy

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Al–Cu–Li and Al–Mg–Li alloys: Phase composition, texture, and anisotropy of mechanical properties (Review)

Cited by 65 publications

References 27 publications

Strengthening mechanisms, deformation behavior, and anisotropic mechanical properties of Al-Li alloys: A review

Strengthening mechanisms, deformation behavior, and anisotropic mechanical properties of Al-Li alloys: A review

A first-principles study on the site occupancy behavior of transition metals in L12-Al3Li phase

Study on Multi-Step Creep Aging Behavior of Al-Li-S4 Alloy

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A first-principles study on the site occupancy behavior of transition metals in L1₂-Al₃Li phase