TEM study of the effect of Y on the scale microstructures of Cr2O3- and Al2O3-Forming alloys
作者： A. Ul-Hamid
关键词: Diffusion 、 Metallurgy 、 Materials science 、 Microstructure 、 Transmission electron microscopy 、 Oxide 、 Chemical engineering 、 Yttrium 、 Isothermal process 、 Alloy 、 Grain boundary
摘要: This study was undertaken to investigate and compare the effects of a yttrium addition on oxide scale development α-Cr2O3- α-Al2O3-forming alloys under isothermal oxidation conditions. The had nominal composition (in wt.%) Ni–30Cr, Ni–30Cr–0.5Y, Ni–30Cr–5Al, Ni–30Cr– 5–Al–0.5Y. They were oxidized in air for 50 hr at 1000°C. microstructures characterized using cross-sectional transmission-electron microscopy combined with energy-dispersive X-ray spectroscopy. It observed that thickness decreases adherence increases due Y addition. growth direction α-Cr2O3 changes from predominately outward inward while countercurrent diffusion within α-Al2O3 is replaced by modification. considered ability scavenge sulfur alloy its segregation grain boundaries primarily account most beneficial effects.
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