The Role of Lattice Misfit on Heterogeneous Nucleation of Pure Aluminum

Wang, L.; Yang, Lin; Zhang, Di; Xia, Mingxu; Wang, Y.; Li, J. G.

doi:10.1007/s11661-016-3691-4

Cited by 55 publications

(30 citation statements)

References 54 publications

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“…However, the crystal plane spacings between the three sets of parallel crystal planes were the same or double. This means that there was lattice distortion at the interface, which was consistent with our previous study, where the nucleated-phase Al fit the substrate with limited lattice distortion within a small lattice misfit (f < 3.1%) [25]. These studies prove that both in situ MgAl 2 O 4 (using physical force) and endogenous MgAl 2 O 4 (controlling for the heating temperature) are possibly potent heterogeneous nucleation substrates in the heterogeneous nucleation of Al alloys.…”

Section: Exogenous Mgal 2 Osupporting

confidence: 91%

The Influencing Factor of MgAl2O4 on Heterogeneous Nucleation and Grain Refinement in Al Alloy Melts

2020

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Grain refinement using oxide additions is commercially feasible and ecofriendly. MgAl2O4 has a lattice structure similar to Al and small lattice misfits with Al, and it can be an effective nucleation core when it meets certain conditions. In this paper, the influencing factor of MgAl2O4 on heterogeneous nucleation and grain refinement in Al alloys was reviewed in terms of physical force, mass percent, particle size and distribution, heating temperature and duration, interface matching, lattice distortion, and chemical reactions at the liquid/solid interfaces. The existence of in situ MgAl2O4 was necessary for heterogeneous nucleation and grain refinement, and the content of MgAl2O4 was a crucial factor in grain refinement. Physical force highly enhanced heterogeneous nucleation and grain refinement through tuning of the wetting, size, and distribution of MgAl2O4 particles with little content. The heterogeneous nucleation of MgAl2O4 played a vital role in grain size reduction when the content was at a critical value. A single crystal of exogenous MgAl2O4 could also be a potent heterogeneous nucleation substrate for Al and Al–Mg alloys under a casting temperature or a high heating temperature with a short holding time for the small lattice misfits between nucleated-phase Al and the MgAl2O4 substrate, with limited lattice distortion.

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Section: Exogenous Mgal 2 Osupporting

confidence: 91%

The Influencing Factor of MgAl2O4 on Heterogeneous Nucleation and Grain Refinement in Al Alloy Melts

2020

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“…The lattice parameters of the three phases are remarkably different from each other, and the three interfaces are accommodated by a periodic of extra or missing planes at the interfaces . Therefore, the total interfacial energy ( E t ) consists of two parts: the coincidence dislocation energy ( E cd ) and strain energy ( E s ) per unit area at the interface, and can be calculated as:

E_{t} = E_{cd} + E_{s}

E_{cd} = \frac{E b^{2}}{8 π (1 - ν) (1 + ν)} (ln \frac{h_{italiccd}}{b} + 1) \times (\frac{1}{m a_{0}})

E_{S} = \frac{E}{1 - ν} h_{italiccd} F^{2}

h_{cd} = \frac{b}{F} \frac{1}{4 π (1 + ν)} (ln \frac{h_{italiccd}}{b} + 1)

where b is burgers vector, E is elastic modulus, ν is poison ration, h cd is the critical thickness to introduce the coincidence dislocations . The distance of the coincidence dislocations is ma 0 , the total length of the coincidence dislocations will be 1/ ma 0 .…”

Section: Discussionmentioning

confidence: 99%

Competitive growth of Al₂O₃/YAG/ZrO₂ eutectic ceramics during directional solidification: Effect of interfacial energy

et al. 2018

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The microstructure evolution and growth behavior of the Al2O3/Y3Al5O12(YAG)/ZrO2 ternary eutectic ceramics during directional solidification were well investigated. During directional solidification of the Al2O3/YAG/ZrO2 ternary eutectic ceramics, {112¯0} Al2O3 paralleled with {001}ZrO2 while they did not parallel with {001}YAG at the same time in the competitive growth stage. All of the interfaces parallel to each other finally. The area percentage of the Al2O3/ZrO2 and YAG/ZrO2 interfaces are 40.4 ± 0.2% and 30.8 ± 0.1%, respectively, higher than that of the Al2O3/YAG (28.8 ± 0.2%). The content of Al2O3 and YAG phases are 39.9% and 41.1%, respectively, almost double of that of ZrO2. The interfaces of Al2O3/ZrO2 and YAG/ZrO2 are shorter and more dispersed than that of the Al2O3/YAG. It was found that the interfacial energy of Al2O3/ZrO2 and YAG/ZrO2 interfaces are lower than that of Al2O3/YAG. It can be concluded that interfacial energy plays a decisive role in affecting the crystallographic orientation and interfaces distribution in the Al2O3/YAG/ZrO2 eutectic since the interfaces of Al2O3/ZrO2 and YAG/ZrO2 with lower interfacial energy can be formed more easily during directional solidification. Therefore, the contents of Al2O3/ZrO2 and YAG/ZrO2 interfaces are higher. This study can provide theoretical guidance for interface design of multi‐phase materials.

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“…In this work, we focus on the substrate-induced liquid layers, which have been extensively studied in the field of lubrication, epitaxial growth, superhydrophobic materials [6], energy-storage materials [8,14], etc. Apart from the aforementioned applications, the liquid layers have also been interpreted as pre-nucleation structures [15,16], which can enhance or weaken the nucleation process [7,17] and dictate their structural features. A further understanding of the substrate-induced liquid layers, in particular the in-plane atomic arrangement, can provide new insights into the heterogeneous nucleation mechanisms [17], and is also beneficial to many industrial applications, such as the design of nucleating agents [18].…”

Section: Introductionmentioning

confidence: 99%

Substrate-Induced Liquid Layering: A New Insight into the Heterogeneous Nucleation of Liquid Metals

Yan

Jing

et al. 2018

Metals

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Abstract:Liquid layering, which is a general phenomenon adjacent to the solid substrates, is less understood for its role in heterogeneous nucleation. In this work, the structural features and dynamics of the liquid Al layers induced by the (0001) sapphire and the (0001) TiB 2 substrates, respectively, are quantitatively compared based on the ab initio molecular dynamics simulations. An almost fully ordered liquid Al layer is observed adjacent to the TiB 2 substrate above the Al melting point, while the liquid layers near the sapphire substrate are weakly ordered with virtually no in-plane translational symmetry. Further liquid layering is facilitated by the ordered liquid layer near the TiB 2 substrate, while impeded by the low in-plane ordering of the liquid layers near the sapphire substrate, resulting in different nucleation behaviors for the two systems. The difference in the liquid layering is caused, in part, by the lower adsorption strength at the sapphire-liquid Al interface than that at the TiB 2 -liquid Al interface. Additionally, the compressive stress imposed on the liquid layers seriously hinders the sapphire-induced liquid layering. We conclude from this work that the interfacial adsorption strength and mismatch alter the heterogeneous nucleation by influencing the features of the substrate-induced liquid layering.

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The Role of Lattice Misfit on Heterogeneous Nucleation of Pure Aluminum

Cited by 55 publications

References 54 publications

The Influencing Factor of MgAl2O4 on Heterogeneous Nucleation and Grain Refinement in Al Alloy Melts

The Influencing Factor of MgAl2O4 on Heterogeneous Nucleation and Grain Refinement in Al Alloy Melts

Competitive growth of Al₂O₃/YAG/ZrO₂ eutectic ceramics during directional solidification: Effect of interfacial energy

Substrate-Induced Liquid Layering: A New Insight into the Heterogeneous Nucleation of Liquid Metals

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The Role of Lattice Misfit on Heterogeneous Nucleation of Pure Aluminum

Cited by 55 publications

References 54 publications

The Influencing Factor of MgAl2O4 on Heterogeneous Nucleation and Grain Refinement in Al Alloy Melts

The Influencing Factor of MgAl2O4 on Heterogeneous Nucleation and Grain Refinement in Al Alloy Melts

Competitive growth of Al2O3/YAG/ZrO2 eutectic ceramics during directional solidification: Effect of interfacial energy

Substrate-Induced Liquid Layering: A New Insight into the Heterogeneous Nucleation of Liquid Metals

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Competitive growth of Al₂O₃/YAG/ZrO₂ eutectic ceramics during directional solidification: Effect of interfacial energy