Abstract
Non-stoichiometric Ni 49.9 Mn 28.6 Ga 21.5 microwires with a diameter of 30-80 μm and cellular grain size of 1-3 μm were developed by melt-extraction. The superelasticity and shape memory effect of the microwires were investigated on a Dynamic Mechanical Analyzer (DMA Q800). The onset critical stresses for austenite to martensite transformation increase linearly with temperature and can be described by Clausius-Clapeyron relationship. The martensite to austenite transformation occurs upon unloading occurs only at temperatures at least 11 °C higher than the martensite start temperature. The as-extracted microwire was loaded in its martensite state to a strain of 2.7% without breaking and 92% plastic deformation strain recovers upon heating.
| Original language | American English |
|---|---|
| Pages (from-to) | S296-S299 |
| Number of pages | 4 |
| Journal | Journal of Alloys and Compounds |
| Volume | 577 |
| Issue number | Supplement 1 |
| DOIs | |
| State | Published - 15 Nov 2013 |
Keywords
- Ni-Mn-Ga
- melt-extraction
- shape memory effect
- superelasticity
EGS Disciplines
- Materials Science and Engineering
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