Optimizing Calcium Addition for Fabricating Aluminum Foams with Different Pore Sizes

Cheng, Ying; Li, Yanxiang; Chen, Xiang; Li, Yong; Zhou, Xu; Wang, Ningzhen

doi:10.2320/matertrans.m2018131

Cited by 8 publications

(3 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In foam metal preparation process, particles or other elements are usually added to improve the stability of foam structure. For example, Ca is added to the melt and stirred in the ambient atmosphere to form the oxide inside metal melts to achieve foam stability, which is also called thickening (Miyoshi et al, 2000;Song et al, 2000;Heim et al, 2017;Cheng et al, 2018). Moreover, Fe or Si has been added in the basic alloy AlSi9Mg0.6 in the first stage of solidification of eutectic alloys to foam Primary Fe and Si-rich crystals which can improve the foam stability (Heim et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Effects of Particle Combinations With Different Wettability on Foam Structure and Stability

Geng

et al. 2021

Front. Mater.

View full text Add to dashboard Cite

Particle addition is an important method to prepare foam metal, and it is of great significance to clarify the mechanism of particle stabilizing liquid metal foam. In this paper, ethanol-water solution system is used to simulate liquid melt foam. By changing the wettability of particles to adjust the distribution position of particles in foam, two types of particles with different wettability are added, which are mixed and optimized in a certain proportion to improve the foam stability as much as possible. The main mechanism is that the large wetting angle particles at the gas-liquid interface to slow down the gas migration, while small wetting angle particles exist in the liquid film, which can reduce the liquid drainage velocity. The experimental results show that the effect of particle wettability on foam structure is greater than that on viscosity enhancement. The particles with large wetting angle are beneficial to the formation and stability of foam, and the particles with small wetting angle cannot stabilize the foam alone. The effect of two types of particle combinations with different wettability on foam stability is better than that of single type of particle. Considering the height and uniformity of the foam structure, the optimal particle combination is finally obtained.

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of Particle Combinations With Different Wettability on Foam Structure and Stability

Geng

et al. 2021

Front. Mater.

View full text Add to dashboard Cite

show abstract

“…Modern trends in the development of methods of plastic deformation of materials are aimed at intensifying production processes by reducing the number of technological transitions from the base workpiece to the final product and is associated with an increase in the degree of deformation of the material in one technological cycle. Among these directions can be identified: the formation of products from materials in the solid-liquid state [1][2][3][4][5][6][7] and the production of products from inhomogeneous, usually porous, materials [8][9][10][11][12][13][14][15]. The main feature of these processes is that the material of the deformable workpiece, in contrast to the traditional processes of processing materials by pressure, has certain values of the initial porosity.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the Process of Deformation of Inhomogeneous Material in the Closed Die

Chernomas

Maryin

Aung

2020

MSF

View full text Add to dashboard Cite

The issues of physical modeling of the processes of deforming inhomogeneous materials are extremely relevant in the development of adequate models of technological processes for the processing of materials by pressure. The object of research is the technology of draft of inhomogeneous material in a closed die. The subject of the research is the processes of evolution of the structure of inhomogeneous material during its deformation. The paper presents a technique that allows to fix the dynamics of compaction of a inhomogeneous flat sample in the process of its draft in a closed die at different rates of deformation and contact conditions in the system «sample – matrix – punch». As a result of the experimental study of the process of draft of inhomogeneous material in a closed matrix, the data characterizing the pore formation and distribution of forces depending on the friction factor, the deformation rate and the degree of deformation are obtained. A method of estimating changes in the geometric parameters of pores in the deformation process is proposed, which allows to determine the front of the material compaction. The obtained experimental data can be used to construct a model describing the deformation of an inhomogeneous medium taking into account the compressibility of the material.

show abstract

“…Calcium is a well-known bubble-stabilizing agent, its addition leads to the formation of various intermetallic phases and oxides, which increases the viscosity of the liquid aluminum. [7,8] It is believed that oxide particles (e.g., CaO and CaAl 2 O 4 ) could contribute to the stability of Al foam by its accumulation on the liquid film of bubbles, which prevents the rupture of metallic films by the elasticity created among bubbles [9] and hinder the drainage of the liquid via the foam structure. [10,11] Kaptay et al [12] suggested various scenarios to predict the stabilization of Al foam with various oxides according to their different wettability (contact angle).…”

mentioning

confidence: 99%

Effect of Calcium Addition on the Aluminum Alloy A201 Foam

Wei,

Zhao,

Ilatovskaia

et al. 2024

Adv Eng Mater

View full text Add to dashboard Cite

To study the effect of calcium on the porosity, sphericity, and microstructure of Al‐Cu foams, a gradient calcium content (0.5, 1.0, 1.5, and 2.0 wt%) was added into aluminum A201 alloy (Al‐Cu alloy) for the cellular aluminum foam preparation via the melt foaming method (TiH2 was used as a bubbling agent). Thereafter, the porosity of the prepared Al foams and their pore size were found to increase, and the sphericity of pores tended to approach to unit with calcium addition. This phenomenon was then explained through the modified thermophysical properties (i.e., surface tension and viscosity) of A201 alloy melts caused by the calcium addition. After the microstructure analysis, a bunch of secondary phases in the A201+Ca alloy foams, e.g., CalAl2Si2, Al2Cu, and Al20CaTi2 as well as an eutectic phase with a great copper content Al8CaCu4 were detected by means of SEM/EDX and XRD.This article is protected by copyright. All rights reserved.

show abstract

Optimizing Calcium Addition for Fabricating Aluminum Foams with Different Pore Sizes

Cited by 8 publications

References 23 publications

Effects of Particle Combinations With Different Wettability on Foam Structure and Stability

Effects of Particle Combinations With Different Wettability on Foam Structure and Stability

Modeling of the Process of Deformation of Inhomogeneous Material in the Closed Die

Effect of Calcium Addition on the Aluminum Alloy A201 Foam

Contact Info

Product

Resources

About