Spark Plasma Sintering TiAl Alloy from Mechanically Activated Powders
Powder of Ti-46at%Al alloy was synthesized through mechanical activation (MA) and then sintered and concurrently consolidated in a short sintering time of 900 s by using spark plasma sintering (SPS) process. The XRD and SEM profiles show that the microstructures of TiAl alloys contained γ TiAl and small amount α-2 Ti3Al phase, whose amount can be controlled by the sintering temperature. The compacts retained the original fine-grained fully densified bodies by avoiding an excessively high sintering temperature. The alloys sintered at higher temperature with this process showed a coarser microstructure. So it is possible to produce dense nanostructured TiAl alloys by mechanically activated spark plasma sintering (MASPS) within a very short period of time.
Guangfan Li, Yong Huang and Chaohe Chen
Z. W. Wang et al., "Spark Plasma Sintering TiAl Alloy from Mechanically Activated Powders", Advanced Materials Research, Vols. 250-253, pp. 3309-3312, 2011