Interaction between nucleant particles and a solid-liquid interface in Al-4.5Cu alloy

Liu, Y.; Han, Qingyou

doi:10.1016/j.actamat.2021.116956

Cited by 22 publications

(18 citation statements)

References 34 publications

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“…As a result, particles should have been engulfed by the growing solid during the normal solidification of composite materials. Experimental data on particle pushing during dendritic solidification in metal matrix composites do not support theoretical predictions [14][15][16][17][18]. Instead of being engulfed, particles are actually pushed by dendrites growing at rates a few orders of magnitude greater than predicted [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 82%

“…Experimental data on particle pushing during dendritic solidification in metal matrix composites do not support theoretical predictions [14][15][16][17][18]. Instead of being engulfed, particles are actually pushed by dendrites growing at rates a few orders of magnitude greater than predicted [14][15][16][17][18][19]. In fact, except for particles that nucleate the growing solid phase, i.e., a particle that exists in the center of a growing grain, there is a lack of convincing experimental observation conforming that particles being actually engulfed within a dendrite arm under cooling conditions, so far tested regardless of ∆σ being posi-tive [14,15] or negative [17][18][19].…”

Section: Introductionmentioning

confidence: 93%

“…growing solid phase, i.e., a particle that exists in the center of a growing grain, there is lack of convincing experimental observation conforming that particles being actually en gulfed within a dendrite arm under cooling conditions, so far tested regardless of Δσ bein positive [14,15] or negative [17][18][19]. Obviously, convection in liquid plays a significant rol in particle pushing [20][21][22].…”

Section: Analysis On the Pet Velocitymentioning

confidence: 99%

“…Such results are in agreement with experimental results reported in Refs. [17][18][19]. In the as-cast specimen where convection existed during its solidification, TiB2 particles were all pushed by the aluminum grains/dendrites and were distributed in the eutectic regions where solidification was completed last.…”

Section: G Vs V Cmentioning

confidence: 99%

“…Such results are in agreement with experimental results reported in Refs. [17][18][19]. Grain Size (µm) In the specimen subjected to isothermal coarsening shown in Figure 3b, two types of particles exist within every aluminum dendrite arm: Al 2 Cu and TiB 2 .…”

Section: G Vs V Cmentioning

confidence: 99%

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Engulfment of a Particle by a Growing Crystal in Binary Alloys

et al. 2022

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Under quasi-steady particle pushing conditions in an alloy, fresh liquid has to flow to the gap separating a particle and an advancing solid–liquid interface of a crystal to feed the volume change associated with the liquid–solid phase transformation. In the meantime, solute rejected by the growing crystal has to diffuse out of the gap against the physical feeding flow. An inequality equation was derived to estimate the pushing-to-engulfment transition (PET) velocity of the crystal under which the particle is pushed by the growing crystal. Experiments were performed in an Al-4.5 wt.%Cu-2 wt.% TiB2 composite under isothermal coarsening conditions. TiB2 particles were indeed engulfed by the growing aluminum dendrites as predicted using the inequality equation. Predictions of the inequality equation also agreed reasonably well with literature data from the solidification of distilled water containing particles obtained under minimal convection conditions. The inequality equation suggests that the PET velocity is much smaller in a binary alloy than that in a pure material. Without the influence of fluid flow or other factors that put a particle in motion in the liquid, the particle should be engulfed by the growing crystal in alloys solidified under normal cooling rates associated with convectional casting conditions.

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Section: Introductionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 93%

Section: Analysis On the Pet Velocitymentioning

confidence: 99%

Section: G Vs V Cmentioning

confidence: 99%

Section: G Vs V Cmentioning

confidence: 99%

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Engulfment of a Particle by a Growing Crystal in Binary Alloys

et al. 2022

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Achieving Superior Strength–Ductility–Conductivity Combination in TiB_2p/6201 Composites via Particle Rotation and Subgrain Refinement

Zhao,

Li,

Liu

et al. 2024

Adv Eng Mater

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The key factor in the material design of overhead power transmission lines is to obtain a desired balance among strength, ductility and electrical conductivity. In this study, TiB2 particulate reinforced aluminum matrix composites were prepared to find a way out of the intrinsic dilemma behind this balance by tailoring the sub‐grain refinement. The interaction in the form of inhomogeneous deformation induced by the flexibility discrepancy between the rigid particles and soft matrix was studied. On the one hand, the hexagonal plate‐like TiB2 particles rotate with the inhomogeneous deformation, forcing the biggest exposed plane ((0001) basal plane) parallel to the plastic flow direction, which is beneficial for the dislocation multiplication and hindrance of dislocation slipping. On the other hand, inhomogeneous deformation generates plentiful geometry necessary dislocations, and divides the microstructure into two types: in the particle‐rich region ultrafine grains are formed, and in the particle‐free region significant sub‐grains refinement is observed. The sub‐grains with 3 wt.% TiB2 is refined from ∽897 nm to ∽248 nm. Thanks to these microstructural benefits, the composites achieve the following strength‐ductility‐conductivity combination: ultimate tensile strength is 370 MPa, elongation after fracture is 11.2%, and electrical conductivity is 51.79% IACS. Besides, the elastic modulus reaches 75.43 GPa.This article is protected by copyright. All rights reserved.

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Modeling the Precipitation of Aluminum Nitride Inclusions during Solidification of High‐Aluminum Steels

Shu,

Visuri,

Alatarvas

et al. 2023

steel research int.

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High‐aluminum advanced high‐strength steels have received increasing interest due to their excellent combination of strength and ductility. The control of non‐metallic inclusions in steel is among the most important issues for the production of high‐aluminum steel. This study proposes a model for the evolution of size distributions of AlN inclusions during the solidification of steel based on the Kampmann‐Wagner numerical model. It also proposes microsegregation calculation. Both homogeneous (pure AlN) and heterogeneous precipitation (AlN+oxide or MnS) were described using the homogeneous nucleation and free growth models of Greer et al. respectively. The present model was applied to calculate the size distributions of AlN in high‐Al (up to 5%) Fe‐Cr‐Al steels and high‐ and medium‐manganese steels and validated by the experimental data in the literature. The model correctly described the influence of cooling rates on the precipitation of AlN in Fe‐Cr‐Al steels and high‐manganese steels, and the sizes of AlN are reduced and the number densities of AlN inclusions are increased by increasing the cooling rate. The effects of nitrogen and aluminum concentration in medium‐manganese steel on inclusion precipitation were investigated by the model calculation. The increases in nitrogen and aluminum concentration facilitate the homogeneous precipitation of AlN inclusions.This article is protected by copyright. All rights reserved.

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Interaction between nucleant particles and a solid-liquid interface in Al-4.5Cu alloy

Cited by 22 publications

References 34 publications

Engulfment of a Particle by a Growing Crystal in Binary Alloys

Engulfment of a Particle by a Growing Crystal in Binary Alloys

Achieving Superior Strength–Ductility–Conductivity Combination in TiB_2p/6201 Composites via Particle Rotation and Subgrain Refinement

Modeling the Precipitation of Aluminum Nitride Inclusions during Solidification of High‐Aluminum Steels

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Interaction between nucleant particles and a solid-liquid interface in Al-4.5Cu alloy

Cited by 22 publications

References 34 publications

Engulfment of a Particle by a Growing Crystal in Binary Alloys

Engulfment of a Particle by a Growing Crystal in Binary Alloys

Achieving Superior Strength–Ductility–Conductivity Combination in TiB2p/6201 Composites via Particle Rotation and Subgrain Refinement

Modeling the Precipitation of Aluminum Nitride Inclusions during Solidification of High‐Aluminum Steels

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Product

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Achieving Superior Strength–Ductility–Conductivity Combination in TiB_2p/6201 Composites via Particle Rotation and Subgrain Refinement