Back to Search
Start Over
Effect of chemical ordering annealing on superelasticity of Ni–Mn–Ga–Fe ferromagnetic shape memory alloy microwires.
- Source :
-
Chinese Physics B . May2020, Vol. 29 Issue 5, p1-6. 6p. - Publication Year :
- 2020
-
Abstract
- Ni50Mn25Ga20Fe5 ferromagnetic shape memory alloy microwires with diameters of ∼ 30–50 μm and grain sizes of ∼ 2–5 μm were prepared by melt-extraction technique. A step-wise chemical ordering annealing was carried out to improve the superelasticity strain and recovery ratio which were hampered by the internal stress, compositional inhomogeneity, and high-density defects in the as-extracted Ni50Mn25Ga20Fe5 microwires. The annealed microwires exhibited enhanced atomic ordering degree, narrow thermal hysteresis, and high saturation magnetization under a low magnetic field. As a result, the annealed microwire showed decreased superelastic critical stress, improved reversibility, and a high superelastic strain (1.9%) with a large recovery ratio (> 96%). This kind of filamentous material with superior superelastic effects may be promising materials for minor-devices. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SHAPE memory alloys
*NICKEL-titanium alloys
*MAGNETIC fields
Subjects
Details
- Language :
- English
- ISSN :
- 16741056
- Volume :
- 29
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Chinese Physics B
- Publication Type :
- Academic Journal
- Accession number :
- 143638249
- Full Text :
- https://doi.org/10.1088/1674-1056/ab8213