Effect of Zr addition on the aging behavior of A319 aluminum cast alloy

Sepehrband, Panthea; Mahmudi, R.; Khomamizadeh, Farzad

doi:10.1016/j.scriptamat.2004.10.025

Cited by 108 publications

(64 citation statements)

References 9 publications

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“…78 According to the literature, 79 it would be necessary to obtain a microstructure containing thermally stable and coarsening-resistant dispersoids in order to improve mechanical properties at high temperatures in an aluminum alloy. These dispersoids or particles will be resistant to coarsening if the energy of their interface with the matrix is low, and if the diffusivity and solubility of the rate-controlling element are both minimal.…”

Section: Effects Of Zirconium On Cast Aluminum Alloysmentioning

confidence: 99%

“…The addition of small amounts of Zr to wrought aluminum alloys has been widely studied, although the effects of the Zx per se on cast aluminum alloys is a topic which has been infrequently discussed in the literature to date. 79 '…”

Section: Effects Of Zirconium On Cast Aluminum Alloysmentioning

confidence: 99%

“…Such improvements in strength and ductility lead to an enhancement of the quality index of the material. 79 Minor additions of Zr to A319 aluminum casting alloys improve the hardness of the material. This is believed to be a direct result of the precipitation of the phase, which not only induces an increase in the hardness of the alloy but also increases the wear resistance of the material to an appreciable extent.…”

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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 Zirconium On Cast Aluminum Alloysmentioning

confidence: 99%

Section: Effects Of Zirconium On Cast Aluminum Alloysmentioning

confidence: 99%

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confidence: 99%

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Improving the performance of 354 type alloy /

Sandoval¹

2010

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“…Above this temperature, a significant drop in strength is observed as a result of rapid coarsening of age hardening precipitates such as those based on Cu or Mg and Si. It has been shown that the addition of transition elements to aluminium alloys improves their high temperature properties [2][3][4]. Specifically, the addition of Zr promotes the formation of metastable cubic Al3Zr precipitates (also referred to as trialuminide dispersoids) with the L12 crystal structure.…”

Section: Introductionmentioning

confidence: 99%

Characterising precipitate evolution in multi-component cast aluminium alloys using small-angle X-ray scattering

Wang

McCartney

et al. 2017

Journal of Alloys and Compounds

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The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. AbstractAluminium alloys can be strengthened significantly by nano-scale precipitates that restrict dislocation movement. In this study, the evolution of inhomogenously distributed trialuminide precipitates in two multi-component alloys was characterised by synchrotron small-angle Xray scattering (SAXS). The appropriate selection of reference sample and data treatment required to successfully characterise a low volume fraction of precipitates in multi-component alloys via SAXS was investigated. The resulting SAXS study allowed the analysis of statistically significant numbers of precipitates (billions) as compared to electron microscopy (hundreds). Two cast aluminium alloys with different volume fractions of Al3ZrxV1-x precipitates were studied. Data analysis was conducted using direct evaluation methods on SAXS spectra and the results compared with those from transmission electron microscopy (TEM). Precipitates were found to attain a spherical structure with homogeneous chemical composition. Precipitate evolution was quantified, including size, size distribution, volume fraction and number density. The results provide evidence that these multi-component alloys have a short nucleation stage, with coarsening dominating precipitate size. The coarsening rate constant was calculated and compared to similar precipitate behaviour.2

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“…2,4 Therefore, researchers have focused significant efforts into improving the mechanical properties of Al-Si alloys at elevated temperatures through tailoring microstructure and alloy composition, and addition of transition elements has been shown to promote thermally stable phases. 2,[4][5][6][7] Both Co and Ni have high melting points and are well known as superalloys for high-temperature applications. 8,9 Limited studies have been carried out on the combined effects of Co and Ni in Al-Si alloys.…”

Section: Introductionmentioning

confidence: 99%

Effect of Co and Ni Addition on the Microstructure and Mechanical Properties at Room and Elevated Temperature of an Al–7%Si Alloy

2017

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Increasing environmental demands are forcing the automotive industry to reduce vehicle emissions by producing more light-weight and fuel efficient vehicles. Al-Si alloys are commonly used in automotive applications because of excellent castability, high thermal conductivity, good wear properties and high strength-to-weight ratio. However, most of the aluminium alloys on the market exhibit significantly reduced strength at temperatures above 200°C. This paper presents results of a study of the effects of Co and Ni in a hypoeutectic Al-Si alloy on microstructure and mechanical properties at room and elevated temperature. Tensile test specimens with microstructures comparable to those obtained in high-pressure die casting, i.e. SDAS * 10 lm, were produced by directional solidification in a Bridgman furnace. The results show an improvement in tensile properties up to 230°C.

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Effect of Zr addition on the aging behavior of A319 aluminum cast alloy

Cited by 108 publications

References 9 publications

Improving the performance of 354 type alloy /

Improving the performance of 354 type alloy /

Characterising precipitate evolution in multi-component cast aluminium alloys using small-angle X-ray scattering

Effect of Co and Ni Addition on the Microstructure and Mechanical Properties at Room and Elevated Temperature of an Al–7%Si Alloy

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