Structural behavior and magnetic properties of a Ni–Mn–Ga single crystal across the martensite/austenite two-phase region

Pagounis, Emmanouel; Laptev, Aleksej; Szczerba, Maciej J.; Chulist, Robert; Laufenberg, Markus

Structural behavior and magnetic properties of a Ni–Mn–Ga single crystal across the martensite/austenite two-phase region

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Date

2015

Authors

Pagounis, Emmanouel

Laptev, Aleksej

Szczerba, Maciej J.

Chulist, Robert

Laufenberg, Markus

DOI (citable link)

10.1016/j.actamat.2015.02.001

Collections

Physik

Publication type

Journal article

Published in

Acta Materialia ; 89 (2015). - pp. 32-40. - ISSN 1873-2453. - eISSN 1359-6454

Abstract

The martensite/austenite two-phase region of a Ni–Mn–Ga single crystal is investigated using different analytical techniques (DSC, SQUID, and XRD) in order to accurately determine the maximum operating temperature for the magnetic shape memory (MSM) effect. It is found that the width ΔT_A = A_f − A_s of the two-phase region and the austenite start temperature A_s are significantly affected by the variant structure of the martensite prior transformation. The austenite finish temperature A_fremains on the other hand constant. In the multi-variant martensite the width ΔT_A measured as large as 20 K, while in the single-variant the width is <2 K. A huge shift of up to 16 K toward higher values was measured in the A_s temperature of the single-variant sample, which in turn determines the maximum MSM operating temperature. Magnetic and mechanical properties across the two-phase region were thoroughly investigated. A considerable improvement of the high-temperature MSM properties is demonstrated for the alloy examined in the present work.

Subject (DDC)

530 Physics

Keywords

Magnetic shape memory, Phase transformation, Structure, Magneto-mechanical properties, Ni–Mn–Ga

Cite This

ISO 690

PAGOUNIS, Emmanouel, Aleksej LAPTEV, Maciej J. SZCZERBA, Robert CHULIST, Markus LAUFENBERG, 2015. Structural behavior and magnetic properties of a Ni–Mn–Ga single crystal across the martensite/austenite two-phase region. In: Acta Materialia. 89, pp. 32-40. ISSN 1873-2453. eISSN 1359-6454. Available under: doi: 10.1016/j.actamat.2015.02.001

BibTex

@article{Pagounis2015Struc-31100,
  year={2015},
  doi={10.1016/j.actamat.2015.02.001},
  title={Structural behavior and magnetic properties of a Ni–Mn–Ga single crystal across the martensite/austenite two-phase region},
  volume={89},
  issn={1873-2453},
  journal={Acta Materialia},
  pages={32--40},
  author={Pagounis, Emmanouel and Laptev, Aleksej and Szczerba, Maciej J. and Chulist, Robert and Laufenberg, Markus}
}

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