Recrystallization, martensite transformation and magnetic characteristic of Co41Ni33Al26 alloy

Feng Hua Luo, Kang Hua Chen, Katsunari Oikawa, Ishida Kiyohito

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Recrystallization behavior and microstructure of cold rolling Co41Ni33Al26 alloy were investigated by optical observation and hardness tester. Magnetic properties and martensite transformation were studied by vibrating sample magnetometer (VSM) and differential scanning calorimetry (DSC) respectively. The results show that the cold rolling Co41Ni33Al26 alloy with a high compress reduction about 43.65% recrystallizes below 1000°C. The volume fraction of β phase increases with the increase of quenching temperature. Many micro-cracks exist at the interface of β/γ phases in cold rolling microstructure due to the disaccorded deforming of β/γ two phases and their existing are benefited to plastic deformation. Furthermore those cracks disappeared when quenching above 1200°C, it means that this alloy have a self repairing ability. Both the values of martensite transformation temperature and Curie point are elevated with the increase of quenching temperature and Curie points are always higher than the martensite transformation temperatures at different quenching temperatures, moreover, magnetocrystalline anisotropy of martensitic phase is higher than that of β mother phase, these results suggest that Co41Ni33Al26 alloy is a promising ferromagnetic shape memory alloy.

Original languageEnglish
Pages (from-to)1-5
Number of pages5
JournalJinshu Rechuli/Heat Treatment of Metals
Volume30
Issue number9
Publication statusPublished - 2005 Sep 1
Externally publishedYes

Keywords

  • CoNiAl alloy
  • Ferromagnetic shape memory alloy
  • Recrystallization

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Mechanical Engineering
  • Metals and Alloys

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