Thermal analysis of relaxation processes of supersaturated vacancies in B2-type aluminides

Ryusuke Nakamura, Kyosuke Yoshimi, Akira Yamauchi, Shuji Hanada

Research output: Contribution to journalConference article

1 Citation (Scopus)

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.

Original languageEnglish
Article numberS5.15
Pages (from-to)535-540
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Volume842
Publication statusPublished - 2005 Aug 25
Event2004 MRS Fall Meeting - Boston, MA, United States
Duration: 2004 Nov 292004 Dec 2

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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