Influence of Sb addition on martensitic and magnetic transformations of (β + γ) two-phase Co-Ni-Al shape memory alloy

Fenghua Luo, Jiayan Chen, Langfei Liu, Katsunari Oikawa, Kiyohito Ishida

Research output: Contribution to journalArticlepeer-review

Abstract

Influence of 1% Sb (atomic fraction) addition in the Co41Ni32Al27 alloy on martensitic transformation and Curie temperature of the alloy was investigated by OM, SEM, EDX, XRD, DSC and VSM methods. The results show that the crystal structure of martensitic in Co41Ni32Al26Sb1 alloy is Ll0 type, as the same as the Co41Ni32Al27. Both martensitic transformation temperature Tm and Curie temperature TC are linear relation to quenching temperature. Tm increased 9 K and TC increased 7.5 K for every 10 K increasing in quenching temperature. Quenched from same temperature, Tm of Co41Ni32Al26Sb1 alloy is higher than that of Co41Ni32Al27 alloy by 70 K, meanwhile TC is higher by 15 K. The melting temperature of Co-Ni-Al alloy decreased by the addition of Sb, eutectic structure appeared in Co41Ni32Al26Sb1 alloy quenched at 1623 K, indicating that the alloy was partially melted. The martensitic transformation temperature range of Co41Ni32Al26Sb1 alloy is 20-28 K, less than half that of Co41Ni32Al27 alloy. This is a very important result to benefit the achievement of large magnetic field induced strain on Co-Ni-Al based alloy. The results of Tm and TC were explained by total average s + d electron concentration and magnetic valence number, Zm separately.

Original languageEnglish
Pages (from-to)785-791
Number of pages7
JournalJinshu Xuebao/Acta Metallurgica Sinica
Volume42
Issue number8
Publication statusPublished - 2006 Aug 1

Keywords

  • Co-Ni-Al-Sb alloy
  • Curie temperature
  • Martensitic transformation

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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