Aluminum composites for automotive applications: A global perspective

Kevorkijan, Varužan

doi:10.1007/s11837-999-0224-2

Cited by 58 publications

(18 citation statements)

References 3 publications

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“…The promotion of MMCs in the automotive market has been held up by the low volume usage of these materials, caused mainly by their high cost which is about three times higher than that of the unreinforced alloy. 58 An acceptable definition for an MMC is that it can be identified by the following characteristics:…”

Section: Effects Of Micro-ceramic Participates (Ai2o3 and Sic) On Mecmentioning

confidence: 99%

Improving the performance of 354 type alloy /

Sandoval¹

2010

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PAR JACOBO HERNANDEZ SANDOVAL AMELIORATION DE LA PERFORMANCE DES ALLIAGES DE TYPE 354AOUT 2010 RESUME En plus de réduire le poids des véhicules et de diminuer la consommation de carburant et les émissions polluantes, les efforts de recherche en cours dans l'industrie automobile ont été axées sur l'amélioration des performances à haute température des composants clés du moteur en particulier en ce qui concerne la préservation des propriétés mécaniques des alliages d'aluminium moulés utilisés dans ces composants à des températures de 200°C à 300°C. L'utilisation de nickel et de zirconium comme éléments d'ajouts pour accroître la résistance à haute température dans ces alliages est basée sur la formation des précipités de A^Ni et A^Zr reconnus pour leur stabilité à des températures élevées, ces particules sont en mesure de mieux supporter le survieillissement à des températures plus élevées que les précipités de A^Cu et Mg2Si normalement présents dans les alliages d'aluminium moulés.L'objectif principal du présent travail de recherche était de déterminer les effets des ajouts mineurs de nickel et de zirconium, ainsi que des dispersoïdes AI2O3 et SiC, sur la résistance à haute température des alliages de fonderie 354. Des expérimentations basées sur l'analyse thermique ont été menées pour acquérir une compréhension des principaux constituants de la microstructure des alliages, tels que les phases intermétalliques et les précipités, ainsi que leur évolution au cours du vieillissement à différentes températures et temps, à savoir 155°C, 170°C, 190°C, 240°C , 300°C et 350°C pendant des périodes allant de 2 à 100 heures. Les propriétés de traction des échantillons tels que coulés et traités thermiquement ont été déterminées à température ambiante et à haute température (190°C, 250°C, 350°C) pour les alliages sélectionnés/conditions basées sur les résultats obtenus des tests à température ambiante. Les échantillons ont été produits dans une moule permanent métallique ASTM-B108. Les résultats des essais de traction ont été examinés en terme des caractéristiques microstructurales des alliages correspondants, afin d'analyser et de comprendre les principaux paramètres impliqués dans le renforcement de l'alliage 354 à des températures élevées.Les résultats montrent que, comme pour l'alliage 319 qui présente des réactions associées à de phases contenant du Cu, l'alliage 354 présente des réactions bien définies à des températures inférieures à 500°C liés aux phases contenant du Cu. Le zirconium réagit seulement avec Ti, Si et Al. Les phases intermétalliques riches en Zr observées dans cette étude se présentent sous deux formes différentes: la phase (Al, Si)2(Zr, Ti) contenant une forte teneur en silicium et ayant la forme d'un bloc, et la phase (Al, Si)3(Zr, Ti) contenant une forte teneur en d'aluminium et ayant la forme d'une aiguille. Il n'y a pas d'empoisonnement observable dans l'affinage de la taille des grains après l'addition de Zr dans les alliages étudiés comme cela a été observé dans les microstructures des échantillo...

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Section: Effects Of Micro-ceramic Participates (Ai2o3 and Sic) On Mecmentioning

confidence: 99%

Improving the performance of 354 type alloy /

Sandoval¹

2010

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“…MMCs, are rapidly emerging as new materials for aerospace It affects the mechanical properties of the composite through and automotive industries due to their relatively low cost mechanisms such as debonding, stress damping, crack deviacompared with continuously reinforced composites. [1][2][3][4][5][6] For tion, and grain-boundary pinning. [7] During its service, a example, since late 1980s, DRACs have been used in autocomposite material may experience phase transformation, motive engines, brake pads, and other parts.…”

Section: Introductionmentioning

confidence: 99%

In-situ formation of SiC-reinforced Al-Si alloy composites using methane gas mixtures

Reddy

2002

Metall Mater Trans B

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Theoretical and experimental studies on the in-situ formation of an Al-Si alloy composite using a methane gas mixture were carried out. An Al-Si alloy composite with in-situ formed SiC as a reinforced phase was produced by bubbling methane gas at temperatures from 1223 to 1423 K. An optical microscope, scanning electron microscope (SEM), and electron microprobe were used for the product characterization. Primary and eutectic silicon were observed in the samples taken from the top part of the crucible, and only eutectic silicon was observed in the samples taken from the bottom of crucible. The SiC formation rate increased with the decrease in the bubble size. A silicon concentration gradient existed at different vertical positions of the liquid alloy. The silicon concentration close to the top of the liquid alloy was higher than that at the bottom. The SiC concentration was very low in the bulk alloy. The bubbling of the gas mixture in the melt resulted in the formation of a layer of foam on top of the crucible. Formed SiC particles were enriched in the foam and carried out of the crucible by the overflow foam to a composite collector located under the crucible. The foam in the composite collector was broken, and composites in the foam contained up to 30 wt pct SiC. The particle size of the SiC is in the range of 1 to 10 m. The bubbling process resulted in the unevenness of the silicon concentration and the different crystallizing processes. The SiC formation rate was found to be about 12.5 mg/(Lиs). A kinetic model was developed. The model-predicted results are in very good agreement with the experimental results.

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“…As material for making of connection rod, composites with aluminium matrix reinforced by SiC (Nissan) or Al 2 O 3 (Dupondt, Chrysler) are used [8]. By application of aluminium connection rod, reduction of fuel consumption and improvement of engine power are done with simultaneous increase of its total production cost [11].…”

Section: Engine Connection Rodmentioning

confidence: 99%

Application of aluminium hybrid composites in automotive industry

Stojаnović

2015

Teh. vjesn.

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Subject reviewStrict requirements that are put on mechanical constructions from the aspect of increase of exploitation periods and reduction of their weights, therefore of their prices as well, implicate developments and applications of new composite materials with matrices of lightweight metals. Composite materials with metal matrices are used for engine cylinders, pistons, disc and drum brakes, Cardan shafts and for other elements in automotive and aviation industry. The most important type of metallic materials is composite materials with matrices of aluminium alloys due to a set of their beneficial properties. Improvement of mechanical, especially tribological properties of hybrid composites were provided by the use of certain reinforce materials such as SiC, Al2O3 and graphite in defined weight or volumetric share. New developed hybrid composites with aluminium matrices have significantly higher resistance to wear, higher specific stiffness and higher resistance to fatigue. By the increase of quantities of produced elements made of hybrid composites, decrease of their prices is induced that even further enlarge their applications. The applications of aluminium hybrid composites are considered from the aspect and with the focus on automotive industry. Keywords: aluminium; application; automotive industry; composites; MMC Primjena aluminijskih hibridnih kompozita u automobilskoj industrijiPregledni članak Pooštravanje konstrukcijskih zahtjeva s aspekta povećanja radnog vijeka i smanjenja mase, a samim tim i cijene konstrukcije, iniciralo je razvoj i primjenu novih materijala s osnovom od lakih metala. Kompoziti s metalnom matricom nalaze sve veću primjenu pri izradi košuljica cilindara motora, klipova, kočionih diskova i doboša, kardanskih vratila kao i drugih dijelova u automobilskoj i avio industriji. Posebno mjesto, od svih metalnih materijala, zauzimaju kompoziti na osnovi legure aluminija zbog niza dobrih svojstava. Poboljšanje mehaničkih, a posebice triboloških karakteristika hibridnih kompozita moguće je uporabom određenih ojačivača, najčešće SiC, Al2O3 i grafita, u odgovarajućem masenom ili volumenskom udjelu. Novodobiveni hibridni kompoziti s aluminijskom osnovom imaju znatno povećanu otpornost na habanje, povećanu specifičnu krutost i povećanu otpornost na zamor. Povećanjem količine proizvedenih dijelova od aluminijskih kompozitnih materijala dolazi do smanjenja cijene ovih dijelova, što dodatno povećava područje njihove primjene. U radu su prikazani primjeri primjene aluminijskih hibridnih kompozita s osvrtom i težištem na automobilskoj industriji.

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Aluminum composites for automotive applications: A global perspective

Cited by 58 publications

References 3 publications

Improving the performance of 354 type alloy /

Improving the performance of 354 type alloy /

In-situ formation of SiC-reinforced Al-Si alloy composites using methane gas mixtures

Application of aluminium hybrid composites in automotive industry

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