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Long—Range Ordering in Rapidly Quenched Llo TiAl Compound Alloys

Published online by Cambridge University Press:  28 February 2011

S.H. Whang ,
Z.X. Li  and
D. Vujic
S.H. Whang
Affiliation:
Department of Metallurgy & Materials Science Polytechnic University 333 Jay Street, Brooklyn, New York 11201
Z.X. Li
Affiliation:
Department of Metallurgy & Materials Science Polytechnic University 333 Jay Street, Brooklyn, New York 11201
D. Vujic
Affiliation:
Department of Metallurgy & Materials Science Polytechnic University 333 Jay Street, Brooklyn, New York 11201
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Abstract

Rapid solidification has an effect on lattice parameters and long&range order parameter in L1o TiAl compound alloys. In these compounds rapid quenching from the liquid state significantly decreases the long—range order parameter while the tetragonal distortion c/a decreases as a result of rapid quenching. The lattice parameter change due to rapid quenching becomes pronounced with increasing aluminum concentration beyond the stoichiometric alloy composition. The recovery from the disordered state and the relaxation from the tetragonal distortion were found to be two different kinetic processes.

The long—range ordering requires low temperature and long annealing time in comparison with high temperature and short annealing time for the recovery of the tetragonal distortion.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 81: Symposium H – High-Temperature Ordered Intermetallic Alloys II , 1986 , 151
Copyright
Copyright © Materials Research Society 1987

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