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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, 21502 Geesthacht, Germany
Li Wang
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, 21502 Geesthacht, Germany
Marcus Rackel
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, 21502 Geesthacht, Germany
Andreas Stark
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, 21502 Geesthacht, Germany
Bernd Schwebke
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, 21502 Geesthacht, GermanyInstitut für Werkstoffkunde und Werkstofftechnik, TU Clausthal, 38678 Clausthal-Zellerfeld
Andreas Schreyer
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, 21502 Geesthacht, GermanyEuropean Spallation Source ERIC, P.O. Box 176, SE-221 00 Lund, Sweden
Florian Pyczak
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, 21502 Geesthacht, 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)

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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

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