Influence of Fe on martensitic and magnetic transformation of p based Co-Ni-Al alloy

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

Research output: Contribution to journalArticle

Abstract

The effects of Fe element on the martensitic and magnetic transformation of Co38Ni33Al29 and Co72-xNixAl28 alloys were investigated by optical micrography, DSC and VSM methods. It is found that Curie point increased 15 K by 2% Fe element for Co38-xNi33Al29Fex alloy quenched from 1623 K × 2 h, but when Fe element content reached 8%, its Curie point increased 160 K. Substituted 2% Fe element for Co element in Co72-xNixAl28 alloys, their Curie points increased 20-30 K and martensitic phase transition temperature decreased 150-170 K when quenched from 1623 K/2 h, whereas, their Curie points increased 30-70 K and martensitic phase transition temperature decreased 50-130 K when quenched from 1523 K/2 h. For the reason of increasing Curie point and decreasing martensitic transition temperature, substituting Fe for Co in β based Co-Ni-Al alloy enlarge the chemical composition range of Co-Ni-Al-Fe alloys located in Tc > Tm, made it move to Ni-rich and Co-poor, Al-poor angles. The variants of martensitic transition temperature and Curie point were discussed by average s + d-electron concentration (e/a).

Original languageEnglish
Pages (from-to)1862-1865
Number of pages4
JournalGongneng Cailiao/Journal of Functional Materials
Volume36
Issue number12
Publication statusPublished - 2005 Dec 1

Keywords

  • Co-Ni-Al-Fe alloy
  • Ferromagnetic shape memory alloy
  • Martensitic transformation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering
  • Polymers and Plastics

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