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

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2015

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Pagounis, Emmanouel
Szczerba, Maciej J.
Chulist, Robert

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https://doi.org/10.1016/j.actamat.2015.02.001
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Acta Materialia. 2015, 89, pp. 32-40. ISSN 1873-2453. eISSN 1359-6454. Available under: doi: 10.1016/j.actamat.2015.02.001

Zusammenfassung

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 ΔTA = Af − As of the two-phase region and the austenite start temperature As are significantly affected by the variant structure of the martensite prior transformation. The austenite finish temperature Af remains on the other hand constant. In the multi-variant martensite the width ΔTA 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 As 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.

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530 Physik

Schlagwörter

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

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ISO 690PAGOUNIS, 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. 2015, 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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    <dcterms:abstract xml:lang="eng">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&lt;sub&gt;A&lt;/sub&gt; = A&lt;sub&gt;f&lt;/sub&gt; − A&lt;sub&gt;s&lt;/sub&gt; of the two-phase region and the austenite start temperature A&lt;sub&gt;s&lt;/sub&gt; are significantly affected by the variant structure of the martensite prior transformation. The austenite finish temperature A&lt;sub&gt;f &lt;/sub&gt;remains on the other hand constant. In the multi-variant martensite the width ΔT&lt;sub&gt;A&lt;/sub&gt; measured as large as 20 K, while in the single-variant the width is &lt;2 K. A huge shift of up to 16 K toward higher values was measured in the A&lt;sub&gt;s&lt;/sub&gt; 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.</dcterms:abstract>
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