Control of Foaming of Al Alloy Melt.

Chu, Sheng; Niu, Qiang; Lin, Yixian; Wu, Keng

doi:10.2355/isijinternational.40.597

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…Furthermore, non-optimized processing conditions have severe eVects on the foaming process. Since TiH 2 absorbs heat when decomposing, therefore the actual melt temperature should be higher than the theoretical temperature [5]. As TiH 2 decomposition starts, the melt temperature drops to the solidi®cation temperature interval.…”

Section: Resultsmentioning

confidence: 99%

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Net shaping via aluminium foaming

Kathuria

2003

Proceedings of the Institution of Mechanical Engineers, Part B:

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The marriage between net shaping and aluminium alloy foaming has given a new dimension to the rapid prototyping technique for manufacturing of the lightweight structure in the automotive and aerospace industries. The present paper is focused on laser-assisted aluminium foaming from a foamable precursor material and its possible applications in net shaping of three-dimensional structures. Preliminary results suggest that a pore size gradient and a density gradient exist in the structure as the processing condition changes. The foam has large pores and lower density for slow processing speed, in contrast with the fast processing speed with small pore size but higher density. For pilot-scale production of the foamed plates, sandwiches panel and localized foamed structure, specially intended for heat exchanger in the electronic industries, the laser foaming technique may be the most appropriate.

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Section: Resultsmentioning

confidence: 99%

“…After the mould has cooled, a semi-®nished net-shape three-dimensional structure of the porous aluminium results (Fig. 1) [5].…”

Section: Castingmentioning

confidence: 99%

Net shaping via aluminium foaming

Kathuria

2003

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Since TiH 2 absorbs heat when it decomposes, the actual melt temperature should be higher than the theoretical temperature. [7] When TiH 2 decomposition starts, the melt temperature drops into the solidification range. Therefore, if the initial foaming temperature is 660 C the effective solidification range for foaming will be restricted, hindering the uniform distribution of the foaming agent (Fig.…”

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confidence: 99%

Laser Assisted Foaming of Aluminum

Kathuria¹

2001

Adv Eng Mater

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Aluminum is one of the most commonly used metals in some industries. In the automobile industries, it has gained acceptance owing to its recyclability, good corrosion resistance, low weight, and the energy saving benefits. Recently aluminum foams [1±12] have evoked considerable interest as an alternative material owing to their wide range of applications ranging from microelectronics, through automobiles to aerospace industries. The manufacturing techniques and characterization methods for aluminum foams require further development to acheive effective and economical use of this material. Various methods, [1±4] including casting and powder metallurgy, have been used with conventional melting and molding to produce Al-foams. In this communication an alternative process using a laser as the heat source will be described. This has the inherent advantage of unidirectional and localized foaming. The process is also fast, owing to rapid solidification, and the stabilization of pore formation can be controlled by coaxial gas flow and the laser processing parameters. In this communication we demonstrate the feasibility of unidirectional and localized expansion of the aluminum foam using the Nd-YAG/CO 2 laser and powder metallurgy. Fundamental aspects of the interaction of the laser beam with the foamable precursor material were investigated. We also examined the influence of the processing conditions on the evolution of cell morphology, and results concerning the density gradient were interpreted. This combined approach allows us to study the physical aspects of laser assisted foaming with respect to its production and quality.The experiments were performed with a 5 kW continuous wave (CW) CO 2 laser featuring a beam-bending optic, which consists of a metallic reflector set at 45 to the beam axis, directing the beam to an off-axis parabolic mirror (Fig. 1A). As specified for this system, it produces a multimode Gaussian beam with a maximum beam diameter of 40 mm. However, because of the anisotropic characteristic of the laser medium, especially the unavoidable diffraction effects, the beam shape is quasi-elliptical. So this beam is focused further by a 254 mm focal length off-axis parabolic mirror onto the target surface. The working distance was varied to produce a defocused spot size of 2±10 mm. An argon gas jet, with a flow rate of 20±40 L/min and coaxial to the beam axis, was used to COMMUNICATIONS 702 ADVANCED ENGINEERING MATERIALS 2001, 3, No. 9 ± [*] Dr.

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Laser assisted aluminum foaming

Kathuria

2001

Surface and Coatings Technology

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Control of Foaming of Al Alloy Melt.

Cited by 7 publications

References 2 publications

Net shaping via aluminium foaming

Net shaping via aluminium foaming

Laser Assisted Foaming of Aluminum

Laser assisted aluminum foaming

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