The Osprey process—will it fly?

Leatham, A.F.; Elias, Luis Guillermo Gonzales; Ogilvy, A. J. W.

doi:10.1016/0026-0657(91)90975-7

Cited by 14 publications

(16 citation statements)

References 1 publication

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“…This is known as semisolid thermal transformation, or SSTT. [9] Other feedstock production processes include sprayforming (Osprey process), [10] the shear-cooling roll (SCR) process, [11] the cooling slope process, [12] and the New Rheocasting (NRC) process [13] patented by UBE Industries Ltd. In NRC, conventional cast material can be used, opening the way for recycling.…”

Section: Introductionmentioning

confidence: 99%

“…In order to enhance the commercial potential of processing alloys in the semisolid state, other more suitable methods of producing the necessary semisolid alloy feedstock have been tried over the years. [5][6][7][8][9][10] Instead of mechanical stirring, a magnetohydrodynamic (MHD) stirring process has been developed. [5,6] In this technique, liquid melt passes through a rotating electromagnetic field within a continuous-casting mold.…”

Section: Introductionmentioning

confidence: 99%

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Rapid compression of aluminum alloys and its relationship to thixoformability

Liu¹,

Atkinson

Kapranos

et al. 2003

Metall Mater Trans A

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Shaping of metals by thixoforming relies on the unusual flow behavior of semisolid slurries containing nondendritic solid phase. The microstructure of an alloy stirred during freezing consists of rounded particles of solid, as opposed to the dendrites associated with conventional solidification. In the semisolid state, these slurries are thixotropic, in that their apparent viscosity is dependent on shear rate and time. Here, a technique of rapid compression testing is outlined, carried out under conditions similar to normal industrial thixoforming, to assess slurry flow behavior and to examine the correlation between feedstock production routes, microstructure, and resistance to flow. Samples are heated to the desired temperature in the semisolid state with various soaking times and rammed at constant velocity against a platen backed by a load cell. The load-displacement curves produced from the tests may show an initial peak, believed to originate from a skeletal structure which rapidly breaks down under shear. The load signal during flow decreases with increasing soaking time and with temperature, and the initial peak eventually disappears in all alloys investigated. Quantitative metallography indicates that the lower loads correspond to greater spheroidicity of the solid particles within the slurry. The curves have been analyzed to derive the viscosity as a function of average shear rate and demonstrate that the semisolid slurries exhibit pseudoplastic flow behavior which is dependent on the compression velocity and is far removed from steady-state conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rapid compression of aluminum alloys and its relationship to thixoformability

Liu¹,

Atkinson

Kapranos

et al. 2003

Metall Mater Trans A

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“…The Sheffield group saw the potential of ceramic dies for thixoforming high temperature alloys and patented this idea [3]. The Sheffield work compared results from spray formed materials [4] (a relatively expensive process) with the RAP (Recrystallisation and Partial Melting) process [5] which simply involved material in the conventionally cast and heavily deformed state for T15, M2 and H13 tool steels and 440C stainless steel, with encouraging results. The consortium then focussed on M2 tool steel for extensive trials, partly because it has a reasonably large freezing range (>40˚C) in comparison with stainless alloys, and partly because its high alloy content leads to a relatively low solidus.…”

Section: Introductionmentioning

confidence: 99%

A review of the semi-solid processing of steel

Atkinson

Rassili

2010

Int J Mater Form

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Steel is a particularly challenging material to semi-solid process because of the high temperatures involved and the potential for surface oxidation. Here the experience of semi-solid processing will be reviewed and the current situation in relation to commercial application assessed. The review will include discussion of the range of potential steel materials which are amenable to thixoforming including thermodynamic prediction of suitable alloy compositions.

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“…Based on these Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jp4:1993731 works, OSPREY Metals Ltd has developed in the 70's a similar process which allows the fabrication of similar alloys without the disadvantage mentioned previously. The process is known as OSPREY process [7].…”

Section: Introductionmentioning

confidence: 99%

Spray cast Al-Si base alloys for stiffness and fatigue strength requirements

Courbiere¹,

Mocellin

1993

J. Phys. IV France

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To cite this version:M. Courbiere, A. Mocellin. Spray cast Al-Si base alloys for stiffness and fatigue strength requirements. SUMMARYHypereutectic AlSiFe spray-cast alloys exhibit properties similar to those of metal-matrix composite (MMC's) : high Young's modulus and a low coefficient of thermal expansion. These physical properties can be adjusted by changing the Si content of the alloy. The refinement of the microstructure is produced by formation of a large amount of nuclei in the spray. Consolidation done by extrusion (bars, tubes or profiles) and/or forging leads to high mechanical properties, especially very good dynamic properties. High fatigue properties coupled with high modulus, good high temperature behaviour and low thermal expansion, allow their use for applications in the automotive industry. In opposition to MMC's, these materials present the advantage of easy recycling and easy machinability as it is the case for the conventional AlSi alloys. The low oxygen content allows quality joining with conventional arc welding techniques.

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The Osprey process—will it fly?

Cited by 14 publications

References 1 publication

Rapid compression of aluminum alloys and its relationship to thixoformability

Rapid compression of aluminum alloys and its relationship to thixoformability

A review of the semi-solid processing of steel

Spray cast Al-Si base alloys for stiffness and fatigue strength requirements

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