Direct measurement of large reversible magnetic-field-induced strain in Ni-Co-Mn-In metamagnetic shape memory alloys

J. A. Monroe, I. Karaman, B. Basaran, W. Ito, R. Y. Umetsu, R. Kainuma, K. Koyama, Y. I. Chumlyakov

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)

Abstract

Direct measurements of reversible magnetic-field-induced strain (MFIS) on a single crystalline Ni 45Co 5Mn 36.5In 13.5 metamagnetic shape memory alloy were attained via magnetic-field-induced martensitic transformation under different stress levels and at various temperatures. This was achieved using a custom-designed micro-magneto-thermo-mechanical testing system capable of applying constant stress while measuring strain and magnetization simultaneously on the samples, which can fit into conventional superconducting magnets. MFIS levels are reported as a function of temperature, magnetic field and external bias stress. It was necessary to apply an external bias stress in these materials to detect a notable MFIS because a magnetic field does not favor a specific martensite variant resulting in no shape change even though magnetic field leads to reversible martensitic transformation. Fully recoverable transformation strains up to 3.10% were detected under repeated field applications in the presence of different compressive stress levels up to 125 MPa. The bias stress opposes the field-induced martensite-to-austenite phase transformation and causes the critical field for the transformation to increase at a given temperature in accordance with the Clausius Clapeyron relationship. The effect of the bias stress on the kinetic arrest of austenite is also explored.

Original languageEnglish
Pages (from-to)6883-6891
Number of pages9
JournalActa Materialia
Volume60
Issue number20
DOIs
Publication statusPublished - 2012 Dec

Keywords

  • Ferromagnetic shape memory alloys
  • Heusler alloys
  • Magnetic shape memory alloys
  • Magnetic shape memory effect
  • Martensitic transformation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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