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@ARTICLE{Terberger:255546,
author = {Terberger, Philipp and Sebold, Doris and Webler, Ralf and
Ziener, Marco and Neumeier, Steffen and Klein, Leonhard and
Virtanen, Sannakaisa and Göken, Mathias and Vassen, Robert},
title = {{I}sothermal aging of a γ′-strengthened
{C}o–{A}l–{W} alloy coated with vacuum plasma-sprayed
{MC}r{A}l{Y} bond coats},
journal = {Surface and coatings technology},
volume = {276},
issn = {0257-8972},
address = {Amsterdam [u.a.]},
publisher = {Elsevier Science},
reportid = {FZJ-2015-05706},
pages = {360 - 367},
year = {2015},
abstract = {Cobalt-based superalloys with a γ/γ′ microstructure
were discovered in 2006 and are currently being investigated
as an alternative to nickel-based superalloys for
high-temperature, high-load applications in gas turbine
blades. They promise a better castability combined with a
similar creep strength. Superalloy turbine blades are
commonly coated with oxidation resistant bond coats. For
this reason their compatibility needs to be studied.
Co–9Al–9W specimens with a γ/γ′ microstructure were
coated with either a nickel-based or cobalt-based MCrAlY
bond coat using vacuum plasma spraying. After aging at 900
°C in air for up to 500 h no decomposition of the γ′
phase was found in the bulk superalloy. The interdiffusion
zone shows several different W-rich topologically
close-packed phases arising from the dissolution of the
γ′ phase in this region. The W-rich phases are identified
to be μ phase for both bond coats and R phase for the
nickel-based bond coat only. Their total volume is higher
for the nickel-based bond coat. Therefore the cobalt-based
bond coat is better suited for the Co-based superalloy
substrate. Room temperature hardness and Young's modulus
were measured using nanoindentation in the initial state and
after heat treatment. A significantly higher Young's modulus
was found for the cobalt-based bond coat.},
cin = {IEK-1},
ddc = {620},
cid = {I:(DE-Juel1)IEK-1-20101013},
pnm = {113 - Methods and Concepts for Material Development
(POF3-113) / HITEC - Helmholtz Interdisciplinary Doctoral
Training in Energy and Climate Research (HITEC)
(HITEC-20170406)},
pid = {G:(DE-HGF)POF3-113 / G:(DE-Juel1)HITEC-20170406},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000360594600045},
doi = {10.1016/j.surfcoat.2015.06.048},
url = {https://juser.fz-juelich.de/record/255546},
}