Foaming characteristics control during production of aluminum alloy foam

Yang, C.C; Nakae, Hideo

doi:10.1016/s0925-8388(00)01136-1

Cited by 75 publications

(29 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In the low-temperature range (<600°C), the initial powder mixture without high-energy milling shows two thermal events from the decomposition of TiH 2 . It has been reported that the process takes place in two steps of TiH 2 → TiH x → α-Ti [21,22]. For the powder mixture milled with milling energy of 25.4 kJ/g, the decomposition temperature is shifted to around 366°C with only one peak.…”

Section: Resultsmentioning

confidence: 99%

Effect of Mechanical Activation on the In Situ Formation of TiB2 Particulates in the Powder Mixture of TiH2 and FeB

Huynh¹,

Kim²,

Kim³

2017

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

The in situ formation of TiB 2 particulates via an interface reaction between Ti and FeB powders was studied. The effects of mechanical activation by high-energy milling on the decomposition of TiH 2 and the interface reactions between Ti and FeB powders to form TiB 2 were investigated. Powder mixtures were fabricated using planetary ball-milling under various milling conditions. The specific ball-milling energy was calculated from the measured electrical power consumption during milling process. High specific milling energy (152.6 kJ/g) resulted in a size reduction and homogeneous dispersion of constituent powders. This resulted in a decrease in the decomposition temperature of TiH 2 and an increase in the formation reaction of TiB 2 particulates in the Fe matrix, resulting in a homogeneous microstructure of nanoscale TiB 2 evenly distributed within the Fe matrix. In contrast, the powder mixture milled with low specific milling energy (36.5 kJ/g) showed an inhomogeneous microstructure composed of relatively large Fe-Fe 2 B particles surrounded by a thin layer of Fe-TiB 2 within a finely dispersed Fe-TiB 2 matrix region.

show abstract

Section: Resultsmentioning

confidence: 99%

Effect of Mechanical Activation on the In Situ Formation of TiB2 Particulates in the Powder Mixture of TiH2 and FeB

Huynh¹,

Kim²,

Kim³

2017

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

show abstract

“…2). The parameters which have been varied include: -content of calcium addition to melt, [6,39] -stirring time prior to TiH 2 addition, [6,9,39] -holding temperature during thickening and foaming, [40] -blowing agent content. [40] This foaming method is less flexible since gas evolution is controlled by thermal decomposition of the blowing agent and one cannot easily manipulate the foaming process.…”

Section: Foaming By Gas Creation In Liquid Alloysmentioning

confidence: 99%

Metal Foams: Production and Stability

2006

View full text Add to dashboard Cite

Liquid metal foam can be generated by creating gas inside a liquid or semi‐liquid metallic melt which has been pre‐treated in a suitable way. Such foams are self‐supporting disordered structures in complete analogy to aqueous foams. The stabilisation mechanism of metallic foams is still not fully understood. In order to facilitate discussion of foam stabilisation the various methods for making such foams are classified with respect to the mode of gas generation and the type of melt used for foaming. Metal foams can be produced by gas injection from an external source or by in‐situ nucleation of gas bubbles in the melt for which various possibilities are known. Melts amenable to foaming range from almost pure molten alloys to melts to which particles have been added, formed by in‐situ reactions or which have been already present in the solid precursor prior to melting. Some of the available experimental evidence for the action of stabilising particles in metallic foams is presented. It is found that although stabilisation seems to be based on the presence of a solid constituent in all the foaming processes, the mechanisms might vary. At present the nature of stabilisation is not yet fully understood and many questions remain open.

show abstract

“…10,11) Various raw materials of aluminum foams have been focused on in recent years, such as pure aluminum, Al-Si alloy, Al-Mg alloy and so on. [12][13][14][15][16][17][18] However, reports on 6063 aluminum foams fabricated by melt foaming method are few. Liu, etc.…”

Section: Instructionmentioning

confidence: 99%

Foaming Process and Properties of 6063 Aluminum Foams by Melt Foaming Method

et al. 2017

View full text Add to dashboard Cite

Aluminum foams made by 6063 aluminum alloy have been prepared by melt foaming method. The uniformity of foam pores is much concerned for that homogeneous pores attribute to excellent properties. It is mainly up to the stirring intensity when adding the blowing agent into the melt, and the cooling rate of the liquid foams. In this paper, 6063 aluminum foams have been fabricated by different stirring times of TiH 2 at different cooling conditions. Microstructure, cell size uniformity and compressive property of the foams have been studied. The melt which mechanically stirred for 6 minutes before foaming and the foam cooled in the air show homogenous pore structure and good mechanical property. The use of 6063 aluminum alloy offers a new raw material to prepare foams with a uniform cell size distribution as well as good mechanical property. InstructionAluminum foam, which was proposed by De Meller for the rst time in the year of 1925, is a kind of cellular material combined with aluminum or its alloys and pores.1,2) The unique structure of aluminum foams brings about a series of superior properties, such as lightweight, high energy absorption capacity, high sound absorption capacity, re resistant property, good electromagnetic shielding property and so on.3-6) Aluminum foams therefore have great application potential in aviation, aerospace, building industry and automobile industry.7-9) Among numerous manufacturing technologies, melt foaming method, also named as Alporas route, is widely adopted at the advantages of its simple fabrication process and industrialized mass production. 10,11) Various raw materials of aluminum foams have been focused on in recent years, such as pure aluminum, Al-Si alloy, Al-Mg alloy and so on.12-18) However, reports on 6063 aluminum foams fabricated by melt foaming method are few. Liu, etc. have examined the impact behavior, deformation mode and energy absorption ability during axial crushing of 6063 aluminum foams, which showed that the dynamic impact contained two steps: initial compression and gradual crushing, and specimens deformed in V -shape or inverted Vshape mode among different density values.19) B.Y. Hur pointed out that porosity and pore size were uniformly distributed with the decreasing in foaming temperature of 6063 aluminum foam. 20) There are some advantages for using 6063 aluminum alloy as raw materials. Firstly, reducing the surface tension of the melt by adding Mg can reduce the interfacial energy between pores and melt, so that pores are stabilized not to combine together and pore diameter is decreased. 21)But too low the surface tension will reduce the melt s stability and incur collapse.22) The amount of Mg (0.45-0.9 mass%) element in 6063 alloy is just appropriate to reduce the surface tension a little. Secondly, liquidus temperature of raw materials applied in melt foaming method should meet the rapid decomposition temperature of the blowing agent. On one hand, the decomposition of blowing agent is speeding up with the raising temperature, so that a higher foa...

show abstract

Foaming characteristics control during production of aluminum alloy foam

Cited by 75 publications

References 7 publications

Effect of Mechanical Activation on the In Situ Formation of TiB2 Particulates in the Powder Mixture of TiH2 and FeB

Effect of Mechanical Activation on the In Situ Formation of TiB2 Particulates in the Powder Mixture of TiH2 and FeB

Metal Foams: Production and Stability

Foaming Process and Properties of 6063 Aluminum Foams by Melt Foaming Method

Contact Info

Product

Resources

About