The properties of two-phase Ni-Al-Fe shape memory alloys in the virgin and shape-memory-cycled states

N. Ono, A. Tsukahara, R. Kainuma, K. Ishida

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

Five polycrystalline Ni-Al-Fe alloys with 14-26 (at.)% Al and 16-26% Fe were made and heat-treated to have β and γ dual phases with from 87% to less than 1% of β phase and to exhibit Ms temperatures at about 300 K. Depending on the β phase fraction and prestraining temperature, the alloys showed pseudoelastic strain recovery ratio from 1-2 up to 35% and shape memory strain recovery ratio from over 10-90% after prestraining by up to 1%. In the alloy with 87% β phase, the latter ratio reached 100% against 0.8% prestrain after a few cycles of shape memory training. Observed results were analyzed based on a model that assumed a simple linear mixture of the properties of the β and γ phases. The results of the analysis suggest that the γ phase after the training in certain conditions is almost elastic and thus acts as a bias spring.

Original languageEnglish
Pages (from-to)420-424
Number of pages5
JournalMaterials Science and Engineering A
Volume273-275
Publication statusPublished - 1999 Dec 15

Keywords

  • Dual phases
  • Ni-Al-Fe alloys
  • Shape memory alloys
  • Shape memory cycling

ASJC Scopus subject areas

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

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