%0 Journal Article
%A Chyrkin, A.
%A Swadźba, R.
%A Pillai, R.
%A Galiullin, T.
%A Wessel, E.
%A Grüner, D.
%A Quadakkers, W. J.
%T Stability of External α-Al2O3 Scales on Alloy 602 CA at 1100–1200 °C
%J Oxidation of metals
%V 90
%N 1-2
%@ 1573-4889
%C Dordrecht [u.a.]
%I Springer Science + Business Media B.V
%M FZJ-2018-07255
%P 119 - 133
%D 2018
%X An external ultrathin α-Al2O3 scale grown on the Ni-base alloy 602 CA during air oxidation at 800 °C was characterized by means of high-resolution TEM/EDX and electron diffraction. Alloy samples pre-oxidized at 800 °C were subsequently exposed at 1100, 1150 and 1200 °C for up to 100 h. Whereas the external alumina remained stable at 1100 °C, with the increasing exposure temperature, the pre-grown alumina scale tended to break down resulting in an external chromia scale accompanied by internal alumina precipitation. The transition from external to internal Al oxidation was investigated using SEM/EDX/EBSD. The critical Al depletion at the scale-alloy interface during the post-exposure at 1100–1200 °C was modeled using the CALPHAD-based thermodynamic-kinetic approach.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000437751900007
%R 10.1007/s11085-017-9827-0
%U https://juser.fz-juelich.de/record/858369