Effect of nitrogen on transformation temperatures of arc-melted Ti-Ni shape memory alloys

Yoshihiro Sato, Hidenori Takahashi, Hiroyuki Kokawa, Takeshi Kuwana, Kiyoshi Yamauchi, Shouichi Sato

Research output: Contribution to journalArticlepeer-review

Abstract

Effects of nitrogen on microstructure and phase transformation temperatures were investigated for near-equiatomic Ti-Ni shape memory alloys arc-melted in Ar-N2 atmospheres. The nitrogen content in the arc-melted specimens increased with increasing melting time and rising nitrogen partial pressure in atmosphere (arc current 150 A, arc voltage 12 V, specimen weight 12 g and melting time 0 to approximately 480 s). With increasing nitrogen content, the amount of second phase observed in arc-melted specimen increased. The second phase was identified as TiN by an electron probe microanalysis and an X-ray diffraction analysis. Both Ms and Af temperatures decreased with increasing nitrogen content of arc-melted specimen. The temperatures of Ms and Af were described by functions of nickel and nitrogen contents.

Original languageEnglish
Pages (from-to)78-85
Number of pages8
JournalUnknown Journal
Volume17
Issue number1
DOIs
Publication statusPublished - 1999 Feb

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces, Coatings and Films
  • Metals and Alloys

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