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A Novel Microstructure in a Rapidly Solidified $Al_{80}Fe_{10}V_4Si_6$ Alloy

Srivastava, AK and Ranganathan, S (1992) A Novel Microstructure in a Rapidly Solidified $Al_{80}Fe_{10}V_4Si_6$ Alloy. In: Scripta Metallurgica et Materialia, 27 (9). pp. 1241-1245.

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Aluminium based alloys with suitable alloying additions are being considered for high temperature applications. Among these, A1-Fe-V-Si alloy has attracted considerable interest. Recently, a commercial alloy developed by Allied Signal, namely FVS0812 (AI- 8Fe-I.4V-1.7Si by wt%), has been re-designated as 8009 by the Aluminium Association [1]. In a pioneering study, Skinner et al. [2] showed the stabilization of the cubic phase in ternary AI-Fe- Si alloy by the addition of a quaternary element, vanadium. The evolution of the microstructure in these alloys both during rapid solidification and subsequent processing is of crucial importance. Kim [3] has demonstrated that the composition of the silicide phase in rapidly solidified A1-Fe-V-Si alloy is very close to $AI_{12}(Fe,V)_3$Si with the body centered cubic (bcc) structure. This structure is closely related to that of quasicrystals. Blank et. al. [4] have observed a globular microstructure of quasicrystalline phase in AI-Si cast alloys, after alloying with Fe and V, by applying laser surface modification technique to get metastable intermetallic phases in AI-Fe-Si system. Recently Ramanan et al. [5] have reported the change in lattice parameter on addition of Fe or V in binary A1- Fe and A1-V alloys. This effect was also studied in quaternary A1-Fe-V-Si alloys by them. A novel microstructure observed in rapidly solidified $Al_{80}Fe_{10}V_4Si_6$ alloy concerning the coexistence of quasicrystalline and crystalline phases is reported here.

Item Type: Journal Article
Publication: Scripta Metallurgica et Materialia
Publisher: Elsevier Science Inc
Additional Information: Copyright of this article belongs to Elsevier Science Inc.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 26 Dec 2007
Last Modified: 19 Sep 2010 04:30
URI: http://eprints.iisc.ac.in/id/eprint/8167

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