Mechanical and magnetic properties of semi-Heusler/light-metal composites consolidated by spark plasma sintering
2017
Abstract
Light-weight ferromagnetic Co-Ni-Al:Ti composites were consolidated by spark plasma sintering. Powders of ball-milled Co-Ni-Al and gas atomized alpha-Ti were mixed together in three different ratios and spark plasma sintered at 950 degrees C, using two sintering times, i.e. dwell times at the maximal temperatures: 1 and 5 min.
The composites were successfully compacted and new intermetallic phases were formed at the Co-Ni-Al/Ti interfaces. The composites exhibit favourable flexural strength, excellent high-temperature stability, and relatively high saturation magnetization.
On the other hand, the newly emerged intermetallic phases are non-ferromagnetic, which slightly deteriorates the magnetic properties.