Magnetic field-induced twin boundary motion in polycrystalline Ni-Mn-Ga fibres

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Date
2008
Volume
10
Issue
Journal
Series Titel
Book Title
Publisher
Milton Park : Taylor & Francis
Abstract

Magnetic field-induced twin boundary motion leading to large magnetic field-induced strain of ~1.0% was established in polycrystalline Ni50.9Mn27.1Ga22.0 (at.%) fibres at room temperature (~60–100 μm in diameter and ~3 mm in length). The fibres' grains are as large as the fibre diameter and of random orientation. At room temperature, a ferromagnetic 5M martensite is found. Magnetic field-induced twin boundary motion was indicated by magnetic measurements and validated by electron backscatter diffraction (EBSD). The application of a magnetic field shifts the equilibrium temperature of martensite and austenite by ~0.4 K T−1, which agrees with calculations using the Clapeyron–Clausius approach.

Description
Keywords
Magnetic field measurement, Magnetic materials, Manganese, Manganese compounds, Nickel, Nickel alloys
Citation
Scheerbaum, N., Heczko, O., Liu, J., Hinz, D., Schultz, L., & Gutfleisch, O. (2008). Magnetic field-induced twin boundary motion in polycrystalline Ni-Mn-Ga fibres. 10. https://doi.org//10.1088/1367-2630/10/7/073002
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License
CC BY-NC-SA 3.0 Unported