Influence of alloying additions on L12 decomposition in Gamma-Gamma′ Co-9Al-9W-2X quaternary alloys

Wang, L.; Oehring, M.; Lorenz, U.; Yang, J.; Pyczak, F.

Journalpaper

Influence of alloying additions on L12 decomposition in Gamma-Gamma′ Co-9Al-9W-2X quaternary alloys

Abstract

The influence of alloying elements on the formation of the intermetallic phases B2 and D019 via L12 decomposition during long-time annealing was investigated in Co-9Al-9W-2X alloys using electron microscopy. It is found that the type, shape and location of these intermetallic phases strongly depend on the alloying elements, which could be mainly attributed to different formation energies. Ti promotes B2 phase formation contrary to Mo, Nb and Ta which stabilize three-phase γ + D019 + B2 domains. Nb greatly destabilized the γ′ phase and is not suggested for alloy design in the Co-9Al-9W system.

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URL: https://publications.hereon.de/id/36279/
Authors:Wang, L., Oehring, M., Lorenz, U., Yang, J., Pyczak, F.
Year:2018
In: Scripta Materialia
Volume:154
Pages:176 - 181
Publisher:Elsevier, Amsterdam
Type:Journalpaper
ISSN: 1359-6462
Cite as: Wang, L.; Oehring, M.; Lorenz, U.; Yang, J.; Pyczak, F.: Influence of alloying additions on L12 decomposition in Gamma-Gamma′ Co-9Al-9W-2X quaternary alloys . In: Scripta Materialia. Vol. 154 (2018) 176 - 181. (DOI: /10.1016/j.scriptamat.2018.05.051)