Premium
Scale growth process at 1473 K on unmodified and yttrium‐ or chromium‐implanted β‐NiAl
Author(s) -
Jedlinski J.,
GrosseauPoussard J.L.,
Bonnet G.,
Kowalski K.,
Bernasik A.,
Smola G.,
Nocun M.
Publication year - 2011
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201005852
Subject(s) - yttrium , chromium , nial , materials science , intermetallic , aluminium , metallurgy , phase (matter) , analytical chemistry (journal) , chemistry , alloy , environmental chemistry , organic chemistry , oxide
Early oxidation of unmodified and yttrium‐implanted or chromium‐implanted β‐NiAl intermetallic compound at 1473 K was studied using a combination of two‐stage‐oxidation exposure with 18 O 2 as a tracer, SIMS elemental distribution analysis (depth profiling and imaging modes) and photoluminescence spectroscopy analysis of the scale phase composition. It was found that phase transformation of transient aluminium oxides, represented by θ‐ Al 2 O 3 into stable and protective α‐Al 2 O 3 occurs locally and is affected by implanted additions: Yttrium retarded while chromium appeared to accelerate it. Typical patch‐ and/or web‐like scale morphology of the growing scales was observed.