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Thermal Analysis of Relaxation Processes of Supersaturated Vacancies in B2-Type Aluminides

Published online by Cambridge University Press:  26 February 2011

Ryusuke Nakamura ,
Kyosuke Yoshimi ,
Akira Yamauchi  and
Shuji Hanada
Ryusuke Nakamura
Affiliation:
Institute for Materials Research, Tohoku University, Katahira 2–1–1, Sendai 980–8577, Japan.
Kyosuke Yoshimi
Affiliation:
Institute for Materials Research, Tohoku University, Katahira 2–1–1, Sendai 980–8577, Japan.
Akira Yamauchi
Affiliation:
Institute for Materials Research, Tohoku University, Katahira 2–1–1, Sendai 980–8577, Japan.
Shuji Hanada
Affiliation:
Institute for Materials Research, Tohoku University, Katahira 2–1–1, Sendai 980–8577, Japan.
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Abstract

Relaxation behavior of supersaturated vacancies in water-quenched and rapidly solidified B2 type CoAl and NiAl with the stoichiometric composition was studied by differential scanning calorimetry (DSC). In both CoAl and NiAl quenched from 1773 K, a single exothermic peak due mainly to the recovery of supersaturated vacancies appeared near 950 K. On the other hand, the exothermic peak was also observed in as-spun rapidly solidified CoAl and NiAl ribbons, and the temperature range of the peak was much broader than that of quenched-in bulks, suggesting that the peak in the rapidly solidified ribbons results from not only a single recovery process of vacancies but also those of some other lattice defects. TEM observation showed that a large amount of dislocations were introduced in the NiAl ribbon and that comparatively many voids as well as an amount of dislocations were introduced in the CoAl ribbon.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 842: Symposium S – Integrative and Interdisciplinary Aspects of Intermetallics , 2004 , S5.15
Copyright
Copyright © Materials Research Society 2005

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References

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