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Page 10 of 18 Chong et al. J Mater Inf 2023;3:21 https://dx.doi.org/10.20517/jmi.2023.17
Figure 7. Surface XRD results of the alloy Pt Al Cr after oxidation at 1,300 °C for 100 h. XRD: X-ray diffraction.
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Figure 8. Surface morphologies at EPMA of the alloy Pt Al Cr after 100 h oxidation in air at 1,300 °C. (A) Surface morphology; (B1)-
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(B4) Pt, Al, O, and Cr map distribution, respectively; (C) Linear distribution of Pt, Al, O, and Cr. EPMA: Electron probe micro-analyzer.
layer. Elements Al and O are distributed on the oxidation layer, and the elements Pt and Cr are in the
substrate. The concertation of Cr in the substrate is much higher than that in the oxidation layer, suggesting
that Cr in Pt Al Cr does not participate in the oxidation process. It is hence concluded that no Cr O exists
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