TY  - JOUR
AU  - Pradeep, K. G.
AU  - Chang, K.
AU  - Kovacs, Andras
AU  - Sen, S.
AU  - Marshal, A.
AU  - de Kloe, René
AU  - Dunin-Borkowski, R. E.
AU  - Schneider, J. M.
TI  - Nano-scale Si segregation and precipitation in Cr 2 Al(Si)C MAX phase coatings impeding grain growth during oxidation
JO  - Materials Research Letters
VL  - 7
IS  - 5
SN  - 2166-3831
CY  - London [u.a.]
PB  - Taylor & Francis
M1  - FZJ-2020-02777
SP  - 180 - 187
PY  - 2019
AB  - We recently reported that the columnar grain width of Cr2AlC MAX phase coatings increases during oxidation (4 h at 1120°C) by 80%, while for 0.7 at.% Si additions to Cr2AlC, coarsening of only 12% was observed. Here, we use nm scale compositional and microstructural investigations to identify significant differences between Cr2AlC and Cr2Al(Si)C. In particular, needle-shaped precipitates coarsen into globular Cr3Si precipitates upon oxidation in the Si-containing MAX phase. We infer that the presence of these precipitates, which are located predominantly along grain boundaries in the MAX phase, retards coarsening during oxidation by Zener pinning.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000463803200002
DO  - DOI:10.1080/21663831.2019.1572663
UR  - https://juser.fz-juelich.de/record/878325
ER  -