From the same journal

Nanoquasicrystalline Al-Fe-Cr-based alloys. Part I: Phase transformations

Research output: Contribution to journalArticlepeer-review

Published copy (DOI)

Author(s)

  • M. Galano
  • F. Audebert
  • I. C. Stone
  • B. Cantor

Department/unit(s)

Publication details

JournalActa Materialia
DatePublished - Oct 2009
Issue number17
Volume57
Number of pages13
Pages (from-to)5107-5119
Original languageEnglish

Abstract

Nanoquasicrystalline Al-Fe-Cr-based alloys composed of sub-micro-sized icosahedral quasicrystalline particles embedded in alpha-Al matrix have a higher strength at elevated temperature compared with commercial Al alloys. However, further improvement of the microstructural stability is desirable in order to maximize the elevated temperature strength. A detailed study of the effect on the microstructure and the phase transformations by the addition of Ti, V, Nb or Ta to a ternary Al-93(Fe3Cr2)(7) alloy was carried out using heat treatment and microstructural characterization. The addition of the fourth element leads to a refined microstructure and can stabilize the icosahedral topology, delaying the quasicrystalline icosahedral phase decomposition until a higher temperature is reached. The addition of Nb or Ta enabled a greater stabilization effect than the addition of Ti or V, retaining a microstructure similar to the as-spun state after heat treatment between 450 and 550 degrees C and even retaining icosahedral particles up to 550 degrees C. The outstanding microstructural stabilization obtained with addition of Nb or Ta leads to very promising applications in the automotive and aeronautic industries. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

    Research areas

  • Al alloys, Melt spinning, Quasicrystals, TEM, QUASI-CRYSTALLINE ALLOYS, MECHANICAL-PROPERTIES, STRUCTURAL-CHARACTERIZATION, RAPID SOLIDIFICATION, ALUMINUM-ALLOYS, STRENGTH, PARTICLES, STABILITY, NANOCRYSTALLINE, NB

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