Influence of external fields on some alloys exhibiting FCC-L10 phase transformation

Katsushi Tanaka, Tetsu Ichitsubo

Research output: Contribution to conferencePaper

Abstract

Influence of external stress or magnetic fields on the volume fractions of the variants in the ordered phase has been examined for some ordered alloys exhibiting the fcc(disorder)-L10(order) phase transformation. The variant fractions are significantly modified under an external field when the heat-treatment temperature for ordering is relatively high, but the effects of a field are markedly diminished below a certain critical temperature. The critical temperature does not depend on kinds of external fields. A theoretical analysis indicates that the temperature is close to the spinodal-ordering temperature, that is, the "nucleation and growth" process is required to alter the variant fractions. When the proportion of the variants is markedly modified, a macroscopic shape change arising from the lattice-constant change is clearly observed. Thus, the shape change at the order-disorder phase transformation can be utilized as a shape-memory function with applying an external field. It was confirmed that a trial actuator composed of FePd and conventional inconel alloys works properly by heating and cooling.

Original languageEnglish
Pages861-866
Number of pages6
Publication statusPublished - 2005 Dec 1
Externally publishedYes
EventInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005 - Phoenix, AZ, United States
Duration: 2005 May 292005 Jun 3

Other

OtherInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005
CountryUnited States
CityPhoenix, AZ
Period05/5/2905/6/3

Keywords

  • Diffusional structural transformation
  • Order-disorder
  • Shape memory effect

ASJC Scopus subject areas

  • Engineering(all)

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    Tanaka, K., & Ichitsubo, T. (2005). Influence of external fields on some alloys exhibiting FCC-L10 phase transformation. 861-866. Paper presented at International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005, Phoenix, AZ, United States.