Effect of stacking fault and amorphous boundary on plastic deformation mechanism of dual-phase nanostructure Mg alloys

Song, H.Y.; Wang, J.Y.; An, M.R.; Xiao, Meixia; Li, Yu Long

doi:10.1016/j.commatsci.2019.03.007

Cited by 6 publications

(4 citation statements)

References 39 publications

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“…5(b). The uniform stacking faults impede the growth of void to a certain extent, which is similar to the results of the dual-phase polycrystalline Mg studied by Song et al [49] Therefore, the void fraction in pure Al is lower than Al-Mg alloys. In Mg 2%-5% considered, the solid solution of Mg leads to the distortion of the ideal lattice, and increasing Mg makes it difficult for the dislocations to slip and propagate in the process of the tensile deformation, which impedes the growth of the void.…”

Section: Effect Of Mg Contents On Mechanical Propertiessupporting

confidence: 87%

Effect of void size and Mg contents on plastic deformation behaviors of Al–Mg alloy with pre-existing void: Molecular dynamics study

Wei

Shi

et al. 2022

Chinese Phys. B

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The plastic deformation properties of cylindrical pre-void Aluminum-Magnesium (Al-Mg) alloy under uniaxial tension are explored using molecular dynamics simulations with embedded atom method (EAM) potential. The factors of Mg content, void size, and temperature are considered. The results show that the void fraction decreases with increasing Mg in the plastic deformation, and it is almost independent of Mg content when Mg is beyond 5%. Both Mg contents and stacking faults around the void affect the void growth. These phenomena are explained by the dislocation density of the sample and stacking faults distribution around the void. The variation trends of yield stress caused by void size are in good agreement with Lubarda model. Moreover, temperature effects are explored, the yield stress and Young's modulus obviously decrease with temperature. Our results may enrich and facilitate the understanding of the plastic mechanism of Al-Mg with defects or other alloys.

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Section: Effect Of Mg Contents On Mechanical Propertiessupporting

confidence: 87%

Effect of void size and Mg contents on plastic deformation behaviors of Al–Mg alloy with pre-existing void: Molecular dynamics study

Wei

Shi

et al. 2022

Chinese Phys. B

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“…The density of line defects and the free energy of grain boundary were increased under the actions of NPs, promoting formations of lattice distortions (Figure 2E). 33 The worn surfaces of specimens 1 and 2 are shown in Figures 3A and B. A smooth wear surface without obvious adhesion patches/deep plowing grooves is observed in Figure 3A, it was difficult to generate plastic deformation and separate to form wear debris under an action of the normal stress/shear force due to the pinning effect of TiN/Ti 5 Si 3 /TiC, improving the wear resistance.…”

Section: Resultsmentioning

confidence: 99%

“…The density of line defects and the free energy of grain boundary were increased under the actions of NPs, promoting formations of lattice distortions (Figure 2E). 33 …”

Section: Resultsmentioning

confidence: 99%

Microstructure performance enhancement of Si₃N₄ reinforced laser clad KF110 base composite coatings

Zhang

Sun

et al. 2021

Int J Applied Ceramic Tech

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The KF110-Si 3 N 4 -La 2 O 3 -Cu composite coatings were fabricated on TA2 by a laser cladding (LC). Microstructure, elemental distribution, high temperature oxidation, and wear resistance were investigated. Research results showed that the nanocrystalline phases (NPs) and the amorphous phases (APs) were formed due to the existence of the short atomic radius elements/fast cooling rate during an LC process; the uniform distributed NPs with the high interface energy were produced due to an addition of Cu, enhancing wear resistance of an LC coating. Lattice distortions were produced due to high temperature of a laserinduced pool (LIP). Addition of the alloy elements enhanced high temperature oxidation resistance of this coating. Excessive addition of Si 3 N 4 caused defects to be produced, enhancing the brittleness of this coating.

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“…This is in reasonably good consistence with previous studies. [26,29,45] What is interesting is that when the AB spacing increases to 8.0 nm, the new grain is formed in the crystalline phase of the Mg 20 Al 80 DPMA model under the strain of 0.14 as shown in Fig. 5(b).…”

Section: Effect Of Amorphous Phasementioning

confidence: 94%

Balancing strength and plasticity of dual-phase amorphous/crystalline nanostructured Mg alloys*

Wang¹,

Song²,

An³

et al. 2020

Chinese Phys. B

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The dual-phase amorphous/crystalline nanostructured model proves to be an effective method to improve the plasticity of Mg alloys. The purpose of this paper is to explore an approach to improving the ductility and strength of Mg alloys at the same time. Here, the effect of amorphous phase strength, crystalline phase strength, and amorphous boundary (AB) spacing on the mechanical properties of dual-phase Mg alloys (DPMAs) under tensile loading are investigated by the molecular dynamics simulation method. The results confirm that the strength of DPMA can be significantly improved while its excellent plasticity is maintained by adjusting the strength of the amorphous phase or crystalline phase and optimizing the AB spacing. For the DPMA, when the amorphous phase (or crystalline phase) is strengthened to enhance its strength, the AB spacing should be increased (or reduced) to obtain superior plasticity at the same time. The results also indicate that the DPMA containing high strength amorphous phase exhibits three different deformation modes during plastic deformation with the increase of AB spacing. The research results will present a theoretical basis and early guidance for designing and developing the high-performance dual-phase hexagonal close-packed nanostructured metals.

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Effect of stacking fault and amorphous boundary on plastic deformation mechanism of dual-phase nanostructure Mg alloys

Cited by 6 publications

References 39 publications

Effect of void size and Mg contents on plastic deformation behaviors of Al–Mg alloy with pre-existing void: Molecular dynamics study

Effect of void size and Mg contents on plastic deformation behaviors of Al–Mg alloy with pre-existing void: Molecular dynamics study

Microstructure performance enhancement of Si₃N₄ reinforced laser clad KF110 base composite coatings

Balancing strength and plasticity of dual-phase amorphous/crystalline nanostructured Mg alloys*

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Effect of stacking fault and amorphous boundary on plastic deformation mechanism of dual-phase nanostructure Mg alloys

Cited by 6 publications

References 39 publications

Effect of void size and Mg contents on plastic deformation behaviors of Al–Mg alloy with pre-existing void: Molecular dynamics study

Effect of void size and Mg contents on plastic deformation behaviors of Al–Mg alloy with pre-existing void: Molecular dynamics study

Microstructure performance enhancement of Si3N4 reinforced laser clad KF110 base composite coatings

Balancing strength and plasticity of dual-phase amorphous/crystalline nanostructured Mg alloys*

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Microstructure performance enhancement of Si₃N₄ reinforced laser clad KF110 base composite coatings