Effect of ion-irradiation on phase transformation in TiNi shape memory alloys

Yoshitaka Matsukawa, Y. Sumita, S. Ohnuki, S. Watanabe, C. Namba, H. Takahashi

Research output: Contribution to journalConference articlepeer-review

Abstract

Ion-irradiation induced amorphization and crystallization processes in TiNi shape memory alloys have been investigated. The primary concern is to clarify the relationship between the critical temperature for irradiation-induced amorphization and the thermal crystallization temperature. The critical temperature for irradiation-induced amorphization was 673 K, however, the edge of the foil specimen crystallized during the irradiation at a lower temperature. The crystallization temperature of the specimen edge during irradiation decreased with increasing of incident ion energy. Thermal annealing experiments revealed that the thermal crystallization preferentially occurred at the specimen edge and the crystalline-amorphous (C-A) interface; The crystallization temperature of the preferential sites were 573 K and 623 K, respectively. These preferential nucleation indicate that the nucleation barrier dominates the thermal crystallization temperature; the critical temperature for amorphization is higher than the thermal crystallization temperature with no nucleation barrier.

Original languageEnglish
Pages (from-to)1147-1158
Number of pages12
JournalASTM Special Technical Publication
Issue number1366
Publication statusPublished - 2000 Dec 1
Externally publishedYes
Event19th International Symposium: Effects of Radiation on Materials - Seattle, WA, USA
Duration: 1998 Jun 161998 Jun 18

ASJC Scopus subject areas

  • Engineering(all)

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