Coalescence of wustite grains during iron oxidation in a hot-stage environmental SEM |
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Authors: | Moonyong Lee Robert A Rapp |
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Affiliation: | (1) Department of Metallurgical Engineering, The Ohio State University, 43210 Columbus, Ohio;(2) Present address: Samsung Semiconductor Co., Yongin-Gin, Kyungki-Do, South Korea |
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Abstract: | The growth of wustite grains during the initial stages of iron oxidation at 1050°C and
atm has been investigated in situ in a hot-stage environmental SEM (HSESEM). Adjacent wustite grains were seen to coalesce by annihilation of the grain boundary dislocations constituting original boundaries. Specifically, dissociation of a grain boundary into an array of dislocations followed by their annihilation either by glide or climb was observed. The grain boundaries exhibiting this coalescence are believed to be low-angle boundaries. A controlled extent of oxidation followed by rapid cooling in the HSESEM enabled the study of wustite grain boundaries. Dissociation of a grain boundary into dislocations without their annihilation was also observed in later stages of oxidation when the dislocation mobility was severely reduced.In this case, instead of grain coalescence, nucleation of a new grain with an orientation different from either of the two original grains took place. |
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Keywords: | Grain coalescence wustite growth environmental SEM |
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