Abstract
The microstructure, martensitic transformation temperatures and shape memory properties of Co-Si binary alloys were investigated by means of optical and transmission electron microscopy, differential scanning calorimetry and a shape memory test. The ε martensite phase with a hexagonal close-packed (hep) structure was observed to coexist with the face-centered cubic (fee) γ parent phase at room temperature. The γ/ε martensitic transformation temperatures linearly increased with Si content up to 4 mol%, but the trend flattened beyond 4 mol%Si while the transformation hysteresis and intervals monotonously increased. The Co-Si alloys exhibited shape recovery at high temperatures up to 900°C and a relatively high thermal stability up to 600°C. These results suggest that Co-Si alloy system has a possibility for high-temperature shape memory alloys.
| Original language | English |
|---|---|
| Pages (from-to) | 2377-2380 |
| Number of pages | 4 |
| Journal | Materials Transactions |
| Volume | 47 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 2006 Sept |
Keywords
- Cobalt-silicon
- High-temperature shape memory alloy
- Martensitic transformation
- Shape memory effect
- ε martensite
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering