Atomic simulation of deformation behavior of dual-phase crystalline/amorphous Mg/Mg-Al nanolaminates

Song, H.Y.; Dai, Jiayin; An, M.R.; Xiao, Meixia; Li, Yu Long

doi:10.1016/j.commatsci.2019.04.034

Cited by 10 publications

(3 citation statements)

References 38 publications

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“…During the deformation of the preoxidized composite, the B 2 O 3 phase is still an amorphous interface layer. With the high-temperature compression deformation, the amorphous interface phase B 2 O 3 turns into molten state at 500 °C, which exhibits a fluid-like feature, that is, it has good fluidity and plastic deformation ability. − Even though the particles break in the deformation process and produce a new surface, it can also be filled by the molten B 2 O 3 without emerging interface gaps caused by the incompatible deformation between the particles and the matrix (Figure (f)), thereby reducing the deformation resistance and improving the hot deformability. In a word, for the B 4 C/Al composites, preoxidation treatment can provide good interface bonding and help to improve the hot deformability.…”

Section: Results and Discussionmentioning

confidence: 99%

Design and Fabrication of a Nanoamorphous Interface Layer in B₄C/Al Composites to Improve Hot Deformability and Corrosion Resistance

Wang

Jiang

Kang

et al. 2020

ACS Appl. Nano Mater.

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In this paper, to improve the hot deformability and corrosion resistance, a nanoamorphous B 2 O 3 layer was designed and fabricated between B 4 C particles and an Al matrix successfully. The B 4 C@B 2 O 3 /Al composites were prepared by a hot-pressed sintering method. By contrast, the B 4 C/Al composites were synthesized using the same preparation method. The results show that the existence of an amorphous layer can effectively inhibit the formation of Al 3 BC, AlB 12 , and other reaction products at the interface, compared with B 4 C/Al composites. At the same time, the existence of an amorphous B 2 O 3 layer can reduce the maximum deformation resistance of the composites under the compression conditions of 500 °C and 0.001 s −1 , to about 76% lower than that of the B 4 C/Al composites, and improve the hot deformability significantly. Furthermore, the corrosion current density of B 4 C@B 2 O 3 /Al composites is 82.5% lower than that of the B 4 C/Al composites. The good corrosion resistance makes B 4 C@B 2 O 3 /Al composites a potential neutron shielding material. KEYWORDS: amorphous B 2 O 3 layer, B 4 C/Al composites, interface structure, high-temperature compression, corrosion resistance

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Section: Results and Discussionmentioning

confidence: 99%

Design and Fabrication of a Nanoamorphous Interface Layer in B₄C/Al Composites to Improve Hot Deformability and Corrosion Resistance

Wang

Jiang

Kang

et al. 2020

ACS Appl. Nano Mater.

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“…[27] Therefore, we also studied the effect of amorphous boundary (AB) spacing on the plastic deformation mechanism of the DPMA. [28,29] The optimal matching relationship between the size of amorphous phase and that of crystalline phase is obtained. However, the relationship between the strength and plasticity of DPMA still needs further studying.…”

Section: Introductionmentioning

confidence: 99%

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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“…They stated a transition from localized plastic flow in amorphous phase to grain boundary mediated plasticity with increasing the crystalline volume fractions. Song et al investigated the atomistic mechanisms of dual-phase crystalline/amorphous nanolaminates and found that both the amorphous layer thickness and the crystalline orientation had effects on the deformation mechanisms [17]. Kalcher et al [18] showed that the interface energy affected the creep behavior of the MG-crystalline nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Atomistic investigation of mechanical properties of metallic glass nanocomposites

Zhou¹,

Wang²,

Chen³

2020

Modelling Simul. Mater. Sci. Eng.

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In this paper, tensile deformation of metallic glass (MG) nanocomposites which consist of cellular MG matrix and columnar grains are studied by the molecular dynamic simulations. The size effects of the ligament thickness and the grain size on the yield strength and plasticity are elucidated. It is found that the ratio of the grain size to the ligament thickness (d/s) has a great influence on the plastic deformation. Two typical deformation mechanisms are further investigated. In the composite models with large d/s, grain boundaries motion and voids formation are the main mechanisms. When d/s decreases to 6, the grains can not only promote multiple shear bands formation but also impede the main shear band propagation. As a result, large plastic plateau appears in the stress–strain curve. These results are helpful to optimize the mechanical properties of MG composites.

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Atomic simulation of deformation behavior of dual-phase crystalline/amorphous Mg/Mg-Al nanolaminates

Cited by 10 publications

References 38 publications

Design and Fabrication of a Nanoamorphous Interface Layer in B₄C/Al Composites to Improve Hot Deformability and Corrosion Resistance

Design and Fabrication of a Nanoamorphous Interface Layer in B₄C/Al Composites to Improve Hot Deformability and Corrosion Resistance

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

Atomistic investigation of mechanical properties of metallic glass nanocomposites

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Atomic simulation of deformation behavior of dual-phase crystalline/amorphous Mg/Mg-Al nanolaminates

Cited by 10 publications

References 38 publications

Design and Fabrication of a Nanoamorphous Interface Layer in B4C/Al Composites to Improve Hot Deformability and Corrosion Resistance

Design and Fabrication of a Nanoamorphous Interface Layer in B4C/Al Composites to Improve Hot Deformability and Corrosion Resistance

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

Atomistic investigation of mechanical properties of metallic glass nanocomposites

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Design and Fabrication of a Nanoamorphous Interface Layer in B₄C/Al Composites to Improve Hot Deformability and Corrosion Resistance

Design and Fabrication of a Nanoamorphous Interface Layer in B₄C/Al Composites to Improve Hot Deformability and Corrosion Resistance