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|Type:||Artigo de periódico|
|Title:||On the properties of the eutectic alloy Al(3)(Nb,Cr)+Cr(Al,Nb)|
dos Santos, AO
|Abstract:||The eutectic alloy Al(3)(Nb,Cr)+Cr(Al,Nb) forms an insitu composite and the Al(3)Nb presents high specific strength and low oxidation rate that may be improved by the combination with other phases. The purpose of this work is to investigate physical, mechanical and oxidation properties of the eutectic alloy. Therefore, Rietveld analysis was carried out for furnace cooled and water quenched samples and oxidation tests were performed on directional solidified samples. Compressive tests were performed for the eutectic alloy and also for the Nb-74.8% Cr-24.6% Al alloy in the as-cast condition. The alloy presents 12.9% Cr(Al,Nb) at room temperature, retained from the transformation Cr(Al,Nb) to Al(Nb)Cr(2). The combination of Al(3)Nb with Cr(AI,Nb) and AI(Nb)Cr, considerably improves mechanical behaviour, leading the yield strength to 1525 MPa at 800 degrees C and 925 MPa at 900 degrees C. The oxidation tests showed the formation of several oxides at all temperatures studied and that from 900 degrees C on alfa Al(2)O(3) is formed both in air and O(2) except under O(2) at 1000 degrees C. It is believed that the Cr(Al,Nb) phase acts as an Al reservoir for the formation of the various Al(2)O(3) scales. (C) 2007 Elsevier B. V. All rights reserved.|
|Editor:||Elsevier Science Sa|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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