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High-temperature oxidation of AZ91-0.3%Ca-0.1%Y alloy in air

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Abstract

AZ91 magnesium alloys containing 0.3% Ca and 0.1% Y were cast, and their oxidation behavior was investigated between 425 and 600 °C in atmospheric air to examine roles of Ca and Y during oxidation. During casting, Ca formed Al2Ca particles intergranularly, and reduced the amount of Al12Mg17 particles, while most of yttrium existed as Al2Y particles inter- and intra-granularly in the alloy. The AZ91 alloy oxidized fast above 425 °C, leading to complete ignition. By contrast, AZ91-0.3Ca-0.1Y alloy oxidized very slowly up to 550 °C. Calcium, which is more active than Mg, preferentially oxidized to CaO at the surface of the MgO-rich oxide to suppress the oxidation, evaporation and diffusion of Mg during the initial oxidation stage. Such suppression was due to the quite low vapor pressure and high stoichiometry of CaO. Calcium also suppressed the formation of less oxidation-resistant Al12Mg17 through forming oxidation-resistant Al2Ca in the alloy from the initial oxidation stage.

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Authors and Affiliations

  1. School of Advanced Materials Science & Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea

    Dong Bok Lee & Muhammad Ali Abro

  2. Materials Commercialization Center, Korea Institute of Materials Science, Changwon, 51508, Republic of Korea

    Bong Sun You

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  1. Dong Bok Lee
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  2. Muhammad Ali Abro
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  3. Bong Sun You
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Correspondence to Bong Sun You.

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Lee, D.B., Abro, M.A. & You, B.S. High-temperature oxidation of AZ91-0.3%Ca-0.1%Y alloy in air. Met. Mater. Int. 23, 720–725 (2017). https://doi.org/10.1007/s12540-017-6745-2

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  • DOI: https://doi.org/10.1007/s12540-017-6745-2

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