@misc{laipple_microstructure_of_2017, 
author={Laipple, D., Wang, L., Rackel, M., Stark, A., Schwebke, B., Schreyer, A., Pyczak, F.},
title={Microstructure of gas atomised Gamma-TiAl based alloy powders},
year={2017},
howpublished = {journal article},
doi = {https://doi.org/10.1557/adv.2017.88},
abstract = {Due to the rapid development of advanced additive manufacturing production routes in recent years, the demand of high-quality alloy powders is significantly increased. We studied gas-atomised spherical powders of several Nb-bearing γ-TiAl based alloys, Ti-45Al-10Nb and Ti-45Al-5Nb-xC in at.% (x = 0, 0.5, 0.75, and 1), which were produced using the plasma melting induction guided gas atomization (PIGA) technique. The phase constitution of different powder fractions was determined by synchrotron high-energy X-ray diffraction at the HEMS beamline DESY (Germany), as well as by SEM, EDX and EBSD measurements. Due to the high cooling rates in the range of 105 K/s, the powder particles mainly consist of hexagonal close packed α-Ti(Al) and body centred cubic β-Ti(Al)-phase. As the cooling rate depends on the particle size, considerable amounts of the β-phase were only found in the small powder fractions (< 45 μm). The total β-phase amount was generally higher in the alloy with a higher Nb content, and also the effect of carbon as a α2-stabilizer was observed. Dendritic cauliflower-like structures are more pronounced in bigger powder particles due to the slower solidification and thus a higher Nb depletion in the remaining melt.},
note = {Online available at: \url{https://doi.org/10.1557/adv.2017.88} (DOI). Laipple, D.; Wang, L.; Rackel, M.; Stark, A.; Schwebke, B.; Schreyer, A.; Pyczak, F.: Microstructure of gas atomised Gamma-TiAl based alloy powders. MRS Advances. 2017. vol. 2, no. 25, 1347-1352. DOI: 10.1557/adv.2017.88}}