Abstract
Electron microscopic analysis has been used to investigate the interfacial phenomena in a high-temperature alloy system. During high-temperature oxidation of Fe-8.9Al-3Cr-31 Mn-0.87C alloy at 800 and 1000° C, an oxidation-induced transformation a layer was observed between the γ matrix and the oxide scale. The morphology of the oxidized sample was studied by scanning electron microscopy, and the elemental redistribution of the constituents was evaluated using an electron microprobe. The concentration of elements was detected with the ZAF-corrected quantitative program. It is believed that the formation of the α layer was caused by the selective oxidation of manganese during the oxidation process. The thickness of the α layer increased with both oxidation time and temperature, the temperature having the greater influence on this transformed layer. In addition, the interfacial concentrations at the γ/α and α/oxide boundaries were employed to investigate the selective oxidation of manganese. © 1988 Chapman and Hall Ltd.