Journal Article

FZJ-2020-02777

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Nano-scale Si segregation and precipitation in Cr 2 Al(Si)C MAX phase coatings impeding grain growth during oxidation

Pradeep, K. G. (Corresponding author) ; Chang, K. ; Kovacs, A.FZJ* ; Sen, S. ; Marshal, A. ; de Kloe, R. ; Dunin-Borkowski, R. E.FZJ* ; Schneider, J. M.

2019
Taylor & Francis London [u.a.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/25462  doi:10.1080/21663831.2019.1572663

Abstract: 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.

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Contributing Institute(s):

1. Physik Nanoskaliger Systeme (ER-C-1)
2. Mikrostrukturforschung (PGI-5)

Research Program(s):

1. 143 - Controlling Configuration-Based Phenomena (POF3-143) (POF3-143)

Appears in the scientific report 2020

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