Designing strong and stiff HCP and BCC Mg alloy structures by templating hard faceted phase using Sn and RE elements

Tian, Guangyuan; Wang, Junsheng; Su, Hui; Wang, Shuo; Xue, Chengpeng; Li, Quan; Yang, Xinghai; Meng, Yanan; Yang, Zhihao; Miao, Yisheng

doi:10.1016/j.jallcom.2023.173291

Cited by 2 publications

(2 citation statements)

References 72 publications

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“…To determine the distribution of the Mg 2 Sn phase in the alloy, the as-prepared alloy was characterized by high-resolution transmission electron microscopy (HADDF-STEM) (Figure 2). 39 It is evident that the alloy was primarily composed of α-Mg and β-Li dual matrix phases. Within the interfacial regions between the two matrix phases, Sn-rich intermetallic phases in the form of short rod-shaped structures were observed, as shown in Figure 2c.…”

Section: Resultsmentioning

confidence: 99%

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Uncovering the Interfacial Strengthening Mechanisms of α-Mg/Mg₂Sn/β-Li Interfaces Using First-Principle Calculations and HAADF-STEM

Tian,

Wang,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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Previously, we reported our new invention of an ultralight (ρ = 1.61 g/cm 3 ) and super high modulus (E = 64.5 GPa) Mg−Li−Al−Zn−Mn−Gd−Y−Sn (LAZWMVT) alloy. Surprisingly, the minor additions of Sn contribute to significant strength and stiffness increases. In this study, we found that Mg 2 Sn was not only the simple precipitate but also acted as the glue to bind the α-Mg/β-Li interface in a rather complicated way. To explore its mechanism, we have performed first-principle calculations and HAADF-STEM experiments on the interfacial structures. It was found that the interfacial structural models of α-Mg/β-Li, α-Mg/Mg 2 Sn, and β-Li/ Mg 2 Sn composite interfaces prefer to form α-Mg/Mg 2 Sn/β-Li ternary composite structures due to the stable formation enthalpy (ΔH: −1.95 eV/atom). Meanwhile, the interface cleavage energy and critical cleavage stress show that Mg 2 Sn contribute to the interfacial bond strength better than the β-Li/α-Mg phase bond strength (σ b (β-Li/Mg 2 Sn): 0.82 GPa > σ b (α-Mg/Mg 2 Sn): 0.78 GPa > σ b (β-Li/α-Mg): 0.62 GPa). Based on the interfacial electronic structure analysis, α-Mg/Mg 2 Sn and β-Li/Mg 2 Sn were found to have a denser charge distribution and larger charge transfer at the interface, forming stronger chemical bonds. Additionally, according to the crystal orbital Hamiltonian population analysis, the bonding strength of the Mg−Sn atom pair was 2.61 eV, which was higher than the Mg−Li bond strength (0.39 eV). The effect of the Mg 2 Sn phase on the stability and interfacial bonding strength of the alloying system was dominated by the formation of stronger and more stable Mg−Sn metal covalent bonds, which mainly originated from the contribution of the Mg 3p-Sn 5p orbital bonding states.

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Section: Resultsmentioning

confidence: 99%

“…(a) HAADF-STEM images; (b−d) elemental mapping maps from the relevant regions of Figure a, (b) Al, (c) Sn, and (d) Zn. (e) Electron diffraction map from the region marked at point e in (a); (f) electron diffraction map from the region marked at point f in panel a and (g) electron diffraction map from the region marked at point g in panel a 39.…”

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confidence: 99%

Uncovering the Interfacial Strengthening Mechanisms of α-Mg/Mg₂Sn/β-Li Interfaces Using First-Principle Calculations and HAADF-STEM

Tian,

Wang,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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Effect of final rolling deformation on microstructure, work hardening and softening behavior of Mg-8Li-3Al-0.3Si alloys

Li,

Deng,

Wang

et al. 2024

Journal of Alloys and Compounds

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Designing strong and stiff HCP and BCC Mg alloy structures by templating hard faceted phase using Sn and RE elements

Cited by 2 publications

References 72 publications

Uncovering the Interfacial Strengthening Mechanisms of α-Mg/Mg₂Sn/β-Li Interfaces Using First-Principle Calculations and HAADF-STEM

Uncovering the Interfacial Strengthening Mechanisms of α-Mg/Mg₂Sn/β-Li Interfaces Using First-Principle Calculations and HAADF-STEM

Effect of final rolling deformation on microstructure, work hardening and softening behavior of Mg-8Li-3Al-0.3Si alloys

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Designing strong and stiff HCP and BCC Mg alloy structures by templating hard faceted phase using Sn and RE elements

Cited by 2 publications

References 72 publications

Uncovering the Interfacial Strengthening Mechanisms of α-Mg/Mg2Sn/β-Li Interfaces Using First-Principle Calculations and HAADF-STEM

Uncovering the Interfacial Strengthening Mechanisms of α-Mg/Mg2Sn/β-Li Interfaces Using First-Principle Calculations and HAADF-STEM

Effect of final rolling deformation on microstructure, work hardening and softening behavior of Mg-8Li-3Al-0.3Si alloys

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Uncovering the Interfacial Strengthening Mechanisms of α-Mg/Mg₂Sn/β-Li Interfaces Using First-Principle Calculations and HAADF-STEM

Uncovering the Interfacial Strengthening Mechanisms of α-Mg/Mg₂Sn/β-Li Interfaces Using First-Principle Calculations and HAADF-STEM