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Evolution of Al-Ti Oxide Inclusion during Isothermal Heating of Fe-Al-Ti Alloy at 1573 K (1300 °C)

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Abstract

Evolution of Al-Ti oxide inclusion during 3 hour isothermal heating of Fe-Al-Ti alloy at 1573 K (1300 °C) was studied. Homogeneous spherical Al-Ti oxide inclusion with nonstoichiometric composition was observed in two as-cast alloys. After heating, most of the homogeneous Al-Ti oxide inclusions changed to heterogeneous ones with Al-rich and Ti-rich parts, while the remaining homogeneous oxides were rare in both alloys. The concentration gradient of Al and O was observed inside the heterogeneous inclusion. The size distribution extended more broadly, and the shape changed from spherical to irregular. The mechanism of the variation was proposed as the diffusion of Al and O in the homogeneous inclusion from the inside to the surface of inclusion to precipitate alumina during heating.

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Authors and Affiliations

  1. Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8561, Japan

    Minggang Li, Hiroyuki Matsuura & Fumitaka Tsukihashi

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  1. Minggang Li
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  2. Hiroyuki Matsuura
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  3. Fumitaka Tsukihashi
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Correspondence to Hiroyuki Matsuura.

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Manuscript submitted November 9, 2016.

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Li, M., Matsuura, H. & Tsukihashi, F. Evolution of Al-Ti Oxide Inclusion during Isothermal Heating of Fe-Al-Ti Alloy at 1573 K (1300 °C). Metall Mater Trans B 48, 1915–1923 (2017). https://doi.org/10.1007/s11663-017-0968-y

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  • DOI: https://doi.org/10.1007/s11663-017-0968-y

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