Thermal Decomposition of Quasi-Crystalline Phases and Mechanical Properties after Hot Extrusion of Rapidly Solidified Al-6.5Fe-1.5V

  1. Dr. P. J. Winkler
  1. M. De Sanctis1,
  2. A. Solina1,
  3. R. Valentini1,
  4. R. Dashwood2,
  5. R. Tongsri2 and
  6. M. Lieblich3

Published Online: 23 DEC 2005

DOI: 10.1002/3527606025.ch26

Materials for Transportation Technology, Volume 1

Materials for Transportation Technology, Volume 1

How to Cite

De Sanctis, M., Solina, A., Valentini, R., Dashwood, R., Tongsri, R. and Lieblich, M. (2000) Thermal Decomposition of Quasi-Crystalline Phases and Mechanical Properties after Hot Extrusion of Rapidly Solidified Al-6.5Fe-1.5V, in Materials for Transportation Technology, Volume 1 (ed P. J. Winkler), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527606025.ch26

Editor Information

  1. DaimlerChrysler AG, Forschung und Technologie, Postfach 800 465, 81663 München, Germany; Tel.: 089–607 22393; Fax: 089–607 28627

Author Information

  1. 1

    University of Pisa, Italy

  2. 2

    Imperial College, London, UK

  3. 3

    CENIM-CSIC, Madrid, Spain

Publication History

  1. Published Online: 23 DEC 2005
  2. Published Print: 20 APR 2000

Book Series:

  1. EUROMAT 99

ISBN Information

Print ISBN: 9783527301249

Online ISBN: 9783527606023

SEARCH

Keywords:

  • transportation technology;
  • materials;
  • aerospace applications;
  • rapidly solidified Al-6.5Fe-1.5V alloy;
  • thermal decomposition of quasi-crystalline phases;
  • mechanical properties;
  • hot extrusion of rapidly solidified Al-6.5Fe-1.5V alloy

Summary

The microstructural development during the hot extrusion of a rapidly solidified Al-6.5Fe-1.5V alloy has been investigated as a function of initial as solidified microstructure and the consolidation temperature. The implications of the microstructural changes on room and elevated temperature mechanical properties have been evaluated. Transmission electron microscopy studies have been performed on the as solidified powders and on the consolidated products. In addition room temperature and elevated temperature (300°C) tensile and creep properties have been evaluated on the as consolidated and heat treated products. It has been found that the as solidified microstructures consist of regions fine quasi-crystalline cellular networks (at the higher cooling rates), and regions containing coarse V rich primary spherical quasi-crystalline dispersoids (at the lower cooling rates). During consolidation the fine quasi-crystalline cellular networks decompose to yield fine dispersoids that are thermally unstable and rapidly coarsen during processing. On the contrary the coarse primary spherical quasi-crystalline dispersoids appear to be stable during consolidation, displaying some crystallisation to icosahedral phases at higher processing temperatures. For this ternary system it can be concluded that, contrary to the general belief, the higher solidification rates do not yield the optimum microstructure for elevated temperature applications.