Effect of oxygen on shape recovery and tensile properties of Ti-Ni alloy weldments - GTA welding of Ti-Ni shape memory alloy (Report 1)

Yoshihiro Sato, Hiroyuki Kokawa, Takeshi Kuwana, Shouichi Sato

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Effects of oxygen on microstructure, shape recovery behavior and tensile properties were investigated for Ti-Ni shape memory alloy weldments. Gas tungsten arc (GTA) welding technique was applied for the alloy under controlled Ar-O2 welding atmospheres. The oxygen content in the weld metal increased with rising oxygen partial pressure and welding current. Many second phase particles were observed in the weld metal which had absorbed oxygen. The second phase was identified as Ti4Ni2O by transmission electron microscopy. Shape recovery behavior was measured for the temperature range of 283 to 372 K. The shape recovery stress of weldment at the 372 K gave equivalent value to that of the base material, however, As temperature of the weld metal decreased with increasing oxygen content. Tensile strength and elongation of the weldment decreased by welding and with increasing oxygen content.

Original languageEnglish
Pages (from-to)311-317
Number of pages7
JournalUnknown Journal
Volume18
Issue number2
DOIs
Publication statusPublished - 2000 May

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Effect of oxygen on shape recovery and tensile properties of Ti-Ni alloy weldments - GTA welding of Ti-Ni shape memory alloy (Report 1)'. Together they form a unique fingerprint.

  • Cite this