Effect of Mg as Sintering Additive on the Consolidation of Mechanically Alloyed Al Powder

Fuentes, J.J.; Rodríguez, João Alcino; Herrera, E. J.

doi:10.4028/www.scientific.net/msf.426-432.4331

Cited by 15 publications

(13 citation statements)

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“…Así pues, el principal efecto del magnesio es la reducción del óxido de aluminio superficial. Por encima de 500 ºC, incluso pequeñas cantidades de Mg reducen la alúmina [25] , promoviendo contactos entre partículas, lo que se traduce en una mejora de las propiedades [26] .…”

Section: Mejoras En El Procesado De Al Amunclassified

Production and processing of ultra-fine grained, nanostructured and amorphous alloys by mechanical alloying

Cintas¹,

Cuevas²,

Montes³

et al. 2007

Rev. metal.

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arrollado, durante los últimos quince años, diversas técnicas para la consolidación de aleaciones de aluminio obtenidas por aleado mecánico (AM) de polvos. Las aleaciones, reforzadas por segundas fases precipitadas durante el procesado, han sido prensadas y sinterizadas por procedimientos convencionales y se ha estudiado la contribución de ayudas a la sinterización, obteniéndose elevadas resistencias y buenas propiedades en caliente. En la actualidad se desarrollan, también por aleado mecánico, aleaciones nanométricas y amorfas en las que, gracias al uso de la sinterización por resistencia eléctrica (SRE), puede preservarse en gran medida la microestructura de los polvos en las piezas consolidadas. Palabras claveAleado mecánico. Nanoestructura. Aleaciones amorfas. Sinterización por resistencia eléctrica.Production and processing of ultra-fine grained, nanostructured and amorphous alloys by mechanical alloying Abstract Several consolidation procedures have been developed during the last fifteen years to process mechanically alloyed (MA) powders at the Metallurgy and Materials Engineering Group (University of Seville). MA powders were processed by conventional cold pressing and vacuum sintering. In addition, several densification promoters were used. The resulting parts, with second phases precipitated during the consolidation, showed good tensile strength, both at room and high temperature. Nowadays, nanostructured and amorphous MA alloys are being processed by electrical resistance sintering (ERS), which prevents microstructure evolution during consolidation.

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Section: Mejoras En El Procesado De Al Amunclassified

Production and processing of ultra-fine grained, nanostructured and amorphous alloys by mechanical alloying

Cintas¹,

Cuevas²,

Montes³

et al. 2007

Rev. metal.

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“…Relatively short exposure time with the assistance of pressure and enclosed-die setup also helps to prevent excessive oxide formation. It has also been reported that the Mg alloy element in Al6061 can eliminate the surface oxides (Fuentes, Rodriguez et al 2003) and improve the interfacial bonding between Al particles by disrupting the oxide layer (Lumley, Sercombe et al 1999). Fogagnolo and Robert et al (2006) and Xie and Hailat et al (2007) reported that ceramic reinforced Al6061 fabricated with pressure assisted sintering of Al6061 at atmospheric environment obtained strong interfacial bonding between the Al6061 particles and reinforcement phase.…”

Section: Methodsmentioning

confidence: 99%

Fabrication of metal matrix composite by semi-solid powder processing

2011

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“…The optimum magnesium concentration is approximately 0.1 to 1.0 wt% [15]. In the compressed Al powder sintering process, pressure is the key for success, while in the Mg additive process, pressure is in presence [14] and Mg is used in addition to improve the property of the compacts. High pressure compression is feasible for conventional powder metallurgy fabrication, as the moulds and dies are made of rigid metals.…”

Section: Introductionmentioning

confidence: 99%

A net shape process for metallic microcomponent fabrication using Al and Cu micro/nano powders

Kim¹,

Jiang²,

Chang³

2005

J. Micromech. Microeng.

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This paper presents a new fabrication process for producing micro Al-based alloy components. The process is based on micro powder injection moulding technology, while the micromoulds are produced using MEMS technology. The process involves (1) fabrication of PDMS micromoulds from SU-8 masters, which are produced using UV photolithography process; (2) making metallic paste by mixing 80 wt% of ultrafine Al (2.5micron in average) powder, 5 wt% Cu nanopowder (less than 60nm), and 15 wt% adhesive binder in about 30ml of acetone; (3) mould filling with metallic paste and demoulding; and (4) sintering of moulded component in Ar atmosphere. The proposed process has been used to sinter Al-Cu powder microcomponents successfully without the help of either high pressure compression or mixing Mg with Al powder. This research proposes a new approach to fabricate 3D micro metallic components to meet the needs in applications where metal, rather than silicon, microcomponents are required.

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Effect of Mg as Sintering Additive on the Consolidation of Mechanically Alloyed Al Powder

Cited by 15 publications

References 0 publications

Production and processing of ultra-fine grained, nanostructured and amorphous alloys by mechanical alloying

Production and processing of ultra-fine grained, nanostructured and amorphous alloys by mechanical alloying

Fabrication of metal matrix composite by semi-solid powder processing

A net shape process for metallic microcomponent fabrication using Al and Cu micro/nano powders

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