Abstract
We analyzed the surface relief caused by stress-induced hcp martensitic transformation in Fe-30Mn-5Si-1A1 shape memory alloy by atomic force microscopy. The alloy exhibits a good shape memory effect and an improved ductility due to a small addition of Al to a conventional Fe-30Mn-6Si shape memory alloy. The orientation of an austenite matrix was determined with surface traces of four {111}f planes, which enabled us to determine the surface tilt angles for all twelve variants of hep martensites and deformation twins. On the basis of these values, stress-induced martensite and deformation twin coexisting in the same grain were identified by studying the surface tilt angles. The surface relieves caused by the stress-induced martensite recovered after heating above the reversed transformation temperature, however some relieves originating from the deformation twin remained.
| Original language | English |
|---|---|
| Pages (from-to) | 812-816 |
| Number of pages | 5 |
| Journal | Materials Transactions |
| Volume | 49 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2008 Apr |
Keywords
- Aluminum addition
- Atomic force microscopy
- Ductility
- Iron-manganese-silicon
- Martensite
- Shape memory alloy
- Twin
- Twinning induced plasticity