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Effect of SPS processing temperature on the microstructure and properties of a Ti49Al47Cr2Nb2 alloy

Published online by Cambridge University Press:  26 February 2011

Alain Couret ,
Guy Molénat ,
Jean Galy  and
Marc Thomas
Alain Couret
Affiliation:
couret@cemes.fr, CNRS, CEMES, 29 Rue J. marvig, BP 94347, Toulouse, 31400 Cedex 4, France, 33 5 62 25 78 71, 33 5 62 25 79 99
Guy Molénat
Affiliation:
molenat@cemes.fr, CEMES/CNRS, BP 94347, Toulouse Cedex4, 31 055, France
Jean Galy
Affiliation:
galy@cemes.fr, CEMES/CNRS, BP 94347, Toulouse Cedex4, 31 055, France
Marc Thomas
Affiliation:
thomas@onera.fr, DMMP/ONERA, BP 72, Chatillon Cedex, 92332, France
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Abstract

The sintering of TiAl alloys by the Spar Plasma Sintering (SPS) technique is investigated in the present paper. Compactions are conducted between 1100°C and 1225°C on a Ti49Al47Cr2Nb2 powder. Single phased and lamellar microstructures are generated at low and high temperatures, respectively. The former exhibits enhanced tensile properties at room temperature but at the expense of a limited creep resistance. On the other hand, the latter suffers from a poor ductility.

The deformation systems which are activated are determined by post-mortem transmission electron microscopy. The behavior of the single phased-alloy is analyzed in terms of the Hall-Petch law.

Keywords

sinteringalloytransmission electron microscopy (TEM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II07-07
Copyright
Copyright © Materials Research Society 2007

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