Thermo-mechanical Phase Transformation of Rapidly Quenched Ti-Ni-Cu Ribbons

Yasubumi Furuya, Minoru Matsumoto, Hisamichi Kimura, Kiyoshi Aoki, Tsuyoshi Masumoto

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

The thermo-mechanical transformation (i.e., the shape memory effect (SME)) of a rapidly quenched Ti-Ni-Cu alloy was investigated. Some comparisons in the properties with the phase transformation (i.e., transformation temperature, thermal hysteresis, its stress dependence, ability of energy conversion, etc.) were done between rapidly quenched (RQ) Ti50Ni40Cu10(at%) ribbons and conventional polycrystalline Ti50Ni40Cu10, Ti50Ni50(at%) wires. The self-deformation associated with the phase transformation (i.e., SME) in the RQ ribbons was 3-4 times larger than that of the conventional poly crystalline alloy wires, and the hysteresis curve of strain vs temperature was narrow in shape and changed sharply at the transformation points under increasing applied stress. Since the RQ ribbons became smaller in self-defor-mation and broader in hysteresis loop by annealing at 973 K, the inferiority of SME in the recrystallized structure with grain nucleation, subsequent grain growth and lower dislocation density was confirmed. From the characterization of the conversion from thermal energy into mechanical energy, the RQ material has more efficient energy conversion ability than the recrystallized polycrystalline materials. More superior characteristics in SME will be anticipated in the microstructural region produced by more rapid solidification control.

Original languageEnglish
Pages (from-to)504-508
Number of pages5
JournalMaterials Transactions, JIM
Volume31
Issue number6
DOIs
Publication statusPublished - 1990

Keywords

  • TiNi alloy
  • energy conversion
  • materials evaluation
  • melt-spinning technique
  • rapid quenching
  • shape memory effect
  • thermal hysteresis
  • thermo-mechanical transformation

ASJC Scopus subject areas

  • Engineering(all)

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