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@ARTICLE{Jalowicka:858383,
      author       = {Jalowicka, A. and Naumenko, D. and Ernsberger, M. and
                      Herzog, R. and Quadakkers, W. J.},
      title        = {{A}lumina {F}ormation and {M}icrostructural {C}hanges of
                      {A}luminized {C}o{N}i{C}r{A}l{Y} {C}oating {D}uring {H}igh
                      {T}emperature {E}xposure in the {T}emperature {R}ange
                      925–1075°{C}},
      journal      = {Materials at high temperatures},
      volume       = {35},
      number       = {1-3},
      issn         = {1878-6413},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2018-07269},
      pages        = {66 - 77},
      year         = {2018},
      abstract     = {MCrAlY (M = Ni, Co) coatings are commonly used on
                      gas-turbine components as oxidation resistant overlay
                      coatings and bondcoats for thermal barrier systems. In the
                      present work the microstructural features and oxidation
                      behavior of an aluminized Co-base MCrAlY-coating on a
                      Ni-based superalloy have been investigated in the
                      temperature range 925–1075 °C. Microstructural studies of
                      the oxidized coatings by SEM/EBSD were complemented with
                      numerical thermodynamic calculations using the software
                      package ThermoCalc. In the as-received condition the outer
                      part of the coating consisted mostly of β-(Ni,Co)Al.
                      Formation of σ-CoCr was observed at the interface between
                      the β-layer and the inner initial CoNiCrAlY. During
                      high-temperature air exposure alumina based surface scales
                      were formed but the oxidation induced Al depletion of the
                      aluminized coating did not result in formation of the
                      γ’-(Ni3Al) phase. Rather, the subscale formation of
                      Co/Cr-rich phases was observed and a direct transformation
                      of β- into γ-Ni phase after longer times. It is expected
                      that these subscale microstructural changes thus affect the
                      alumina formation and growth as well as the critical
                      aluminum depletion in a different manner as in the case of
                      corresponding β-NiAl coatings, although a direct comparison
                      between various coating systems was not possible on the
                      basis of the present results.},
      cin          = {IEK-2},
      ddc          = {670},
      cid          = {I:(DE-Juel1)IEK-2-20101013},
      pnm          = {111 - Efficient and Flexible Power Plants (POF3-111)},
      pid          = {G:(DE-HGF)POF3-111},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000435483900009},
      doi          = {10.1080/09603409.2017.1392114},
      url          = {https://juser.fz-juelich.de/record/858383},
}