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 language | English |
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Pages (from-to) | 78-85 |
Number of pages | 8 |
Journal | Unknown Journal |
Volume | 17 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1999 Feb |
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Surfaces, Coatings and Films
- Metals and Alloys