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Microstructure of gas atomised γ-TiAl based alloy powders

Published online by Cambridge University Press:  23 January 2017

Daniel Laipple ,
Li Wang ,
Marcus Rackel ,
Andreas Stark ,
Bernd Schwebke ,
Andreas Schreyer  and
Florian Pyczak
Daniel Laipple*
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, 21502Geesthacht, Germany
Li Wang
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, 21502Geesthacht, Germany
Marcus Rackel
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, 21502Geesthacht, Germany
Andreas Stark
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, 21502Geesthacht, Germany
Bernd Schwebke
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, 21502Geesthacht, Germany Institut für Werkstoffkunde und Werkstofftechnik, TU Clausthal, 38678Clausthal-Zellerfeld
Andreas Schreyer
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, 21502Geesthacht, Germany European Spallation Source ERIC, P.O. Box176, SE-221 00 Lund, Sweden
Florian Pyczak
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, 21502Geesthacht, Germany
*
*(Email: daniel.laipple@hzg.de)
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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.

Keywords

powder metallurgyscanning electron microscopy (SEM)x-ray diffraction (XRD)
Type
Articles
Information
MRS Advances , Volume 2 , Issue 25: Mechanical Behavior and Failure Mechanisms of Materials , 2017 , pp. 1347 - 1352
Copyright
Copyright © Materials Research Society 2017 

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References

REFERENCES

Gerling, R., Clemens, H., and Schimansky, F. P., Advanced Engineering Materials, 6 (2004), 23–38.CrossRefGoogle Scholar
Bewlay, B.P., Weimer, M., Kelly, T., Suzuki, A., Subramanian, P.R., Materials Research Society Symposium Proceedings, 1516, (2013), 49–58. doi: 10.1557/opl.2013.44 CrossRefGoogle Scholar
Jabbar, H., Monchoux, J.-P., Houdellier, F., Dollé, M., Schimansky, F.-P., Pyczak, F., Thomas, M., Couret, A., Intermetallics, 18, (2010), 2312–2321. doi: 10.1016/j.intermet.2010.07.024 CrossRefGoogle Scholar
Gussone, J., Hagedorn, Y.-C., Gherekhloo, H., Kasperovich, G., Merzouk, T., Hausmann, J., Intermetallics, 66, (2015), 133–140. doi: 10.1016/j.intermet.2015.07.005 CrossRefGoogle Scholar
Baudana, G., Biamino, S., Klöden, B., Kirchner, A., Weißgärber, T., Kieback, B., Pavese, M., Ugues, D., Fino, P., Badini, C., Intermetallics, 73, (2016), 43–49. doi: 10.1016/j.intermet.2016.03.001 CrossRefGoogle Scholar
Hammersley, A. P., Svensson, S. O., Hanfland, M., Fitch, A. N., Hausermann, D., High Pressure Research 1996, 14, 235–248,CrossRefGoogle Scholar
Kraus, W., Nolze, G., Journal of applied Crystallography 29 (1996), 301–303. doi: 10.1107/S0021889895014920 CrossRefGoogle Scholar
Laipple, D., Stark, A., Schimansky, F.-P., Schwebke, B., Pyczak, F., Schreyer, A., Key Engineering Materials, 704 (2016), 214–222. doi: 10.4028/www.scientific.net/KEM.704.214 CrossRefGoogle Scholar
Mayer, S., Petersmann, M., Fischer, F.D., Clemens, H., Waitz, T., Antretter, T., Acta Materialia 115 (2016), 242–249. doi: 10.1016/j.actamat.2016.06.006 CrossRefGoogle Scholar