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BSE image (×8000) of a cross section of the alloy OHC5 after isothermal oxidation at 1200 °C for 100h. The EDS qualitative analyses spectra for 1 to 4 indicated (1) Al2O3, (2) (Nb,Ti)(Si,Al)2, (3) (Nb,Ti,Cr)(Si,Al)2 and (4) (Nb,Cr,Ti)6Si5.
