Effect of alloying elements on fcc/hcp martensitic transformation and shape memory properties in Co-Al alloys

Keisuke Ando, Toshihiro Omori, Jun Sato, Yuji Sutou, Katsunari Oikawa, Ryosuke Kainuma, Kiyohito Ishida

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Effects of alloying elements (Si, Ti, V, Cr, Mn, Fe, Ni, Nb, Mo, Ta and W) on γ (fcc)/ε (hcp) martensitic transformation, ductility and shape memory (SM) properties of Co 90Al 10 alloy were investigated by means of differential scanning calorimetry, X-ray diffraction method, cold-rolling and an SM test. The addition of Ti, V, Mn, Fe, Ni, Nb, Mo, Ta or W decreased the volume fraction of the ε martensite phase (V m), resulting in improvement of the ductility due to the stabilization of the γ phase, and the addition of Si or Cr, known as hep stabilizing elements, slightly decreased V m. The relationship between the martensitic transformation temperatures and V m was determined in Co-Al and Co-Al-Fe alloys. Co-Al alloys showed behavior different from that of other alloys. The SM effect decreased with decreasing V m and the Co-Al binary alloys showed the highest SM effect in this study, whereas the transformation temperatures and the ductility could be controlled by the alloying element.

Original languageEnglish
Pages (from-to)2381-2386
Number of pages6
JournalMaterials Transactions
Volume47
Issue number9
DOIs
Publication statusPublished - 2006 Sep

Keywords

  • Alloying element
  • Cobalt-aluminum
  • Ferromagnetic shape memory alloy
  • High-temperature shape memory alloy
  • Martensitic transformation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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