Abstract
The surface relief caused by stress-induced fcc/hcp martensitic transformation in an Fe-30Mn-5Si-1Al shape memory alloy, which exhibited a good shape memory effect and an improved ductility due to a small addition of aluminum to a conventional Fe-30Mn-6Si shape memory alloy, was quantitatively analyzed by atomic force microscopy. The orientation of an austenite grain was determined with surface traces of four {111} f planes, which made it possible to determine the surface tilt angles for all 12 variants of hep martensite and deformation twins. On the basis of these values, the stress-induced martensite and deformation twin, coexisting in a grain, were identified by investigating the surface tilt angles. The surface relief caused by the stress-induced martensite recovered after heating above the reverse transformation temperature, but that due to the deformation twin remained unaltered.
| Original language | English |
|---|---|
| Pages (from-to) | 672-677 |
| Number of pages | 6 |
| Journal | Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals |
| Volume | 71 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 2007 Sept |
| Externally published | Yes |
Keywords
- Atomic force microscopy
- Deformation twinning
- Ductility
- Iron-manganese-silicon- aluminum
- Shape memory alloy
- Stress-induced martensitic transformation
- Twinning induced plasticity
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys
- Materials Chemistry