In Situ observation of the effect of temperature on Cu2O scale morphology |
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| Authors: | Bülent Önay Robert A Rapp |
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| Affiliation: | (1) Present address: Research Laboratory of Engineering Materials, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, 227 Yokohama, Japan;(2) Department of Metallurgical Engineering, Ohio State University, 43210 Columbus, Ohio |
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| Abstract: | The effect of temperature on copper oxide scale morphology was studied during in situ oxidation of OFHC copper in a hot-stage environmental scanning electron microscope (HSESEM). Cuprous oxide scales grown at low temperature 0.2Tm(Cu2O)] and intermediate temperatures 0.6–0.7Tm(Cu2O)] were found to be crystallographically oriented. At intermediate temperatures, scales exhibited nonplanar features such as ridges and growth pyramids. At high temperatures T> 0.8Tm(Cu2O)], scales had planar morphologies and a few dislocation growth pits. Downquenching and upquenching of the Cu2O scales from steady-state oxidation temperatures induced morphological changes such as cavity formation and surface reconstruction. |
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| Keywords: | In situ oxidation epitaxy short-circuit difiusion thermal cycling cavity formation |
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