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Nanocrystalline TiAl Compacts Prepared by Hddr and Hot Pressing

Published online by Cambridge University Press:  15 February 2011

K. Aoki ,
Y. Itoh ,
Y. Kawamura ,
A. Inoue  and
T. Masumoto
K. Aoki
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980–77, Japan
Y. Itoh
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980–77, Japan
Y. Kawamura
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980–77, Japan
A. Inoue
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980–77, Japan
T. Masumoto
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980–77, Japan
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Abstract

Nanocrystalline TiAl powder was formed by the modified HDDR (hydrogenation-disproportion-dehydrogenaton-recombination) method utilizing ball milling in a hydrogen atmosphere. That is, TiAl compound powder decomposed into TiH2 and Al-rich TiAl powders by mechanical grinding in a hydrogen atmosphere (HD process). Dehydrogenaton-recombination (realloying) resulted in the formation of nanocrystalline TiAl powder when heated to about 700 K in an argon atmosphere (DR process). Almost fully dense nanocrystalline TiAl compacts were prepared by a combination of HDDR and hot-pressing at 873 K which is lower than the usual consolidation temperature by about 300 K. The TiAl compact thus made was brittle in the as-pressed state but showed compressive ductility after annealing.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 153
Copyright
Copyright © Materials Research Society 1997

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References

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