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

doi:10.2207/qjjws.17.78

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

ENG - Materials Processing

Research output: Contribution to journal › Article › peer-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 language	English
Pages (from-to)	78-85
Number of pages	8
Journal	Unknown Journal
Volume	17
Issue number	1
DOIs	https://doi.org/10.2207/qjjws.17.78
Publication status	Published - 1999 Feb

ASJC Scopus subject areas

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

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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.",

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T1 - Effect of nitrogen on transformation temperatures of arc-melted Ti-Ni shape memory alloys

AU - Sato, Yoshihiro

AU - Takahashi, Hidenori

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AU - Kuwana, Takeshi

AU - Yamauchi, Kiyoshi

AU - Sato, Shouichi

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AB - 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.

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