Abstract
Laser micro-welding has been considered one of the most promising joining methods of manufacturing Nitinol biomedical devices. However, there is still a lack of understanding about how laser micro-welding influences the microstructure. This work attempts to reveal the phase content within various microstructural zones of laser micro-welded crossed Nitinol wires by transmission electron microscopy (TEM) with the assistance of the focused ion beam (FIB) technique. The base metal is composed of a single austenite phase (B2). The fusion zone exhibits the coexistence of austenite matrix and several intermetallics (T2Ni, TiNi3 and Ti3Ni4). The precipitation of R-phase was observed in HAZ with B2 matrix due to thermally induced stresses during welding.
Original language | English (US) |
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Pages (from-to) | 40-45 |
Number of pages | 6 |
Journal | Materials Characterization |
Volume | 135 |
DOIs | |
State | Published - Jan 2018 |
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering