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Magnesium Technology 2019 pp 37–41Cite as

TEM Studies of In Situ Formation of MgO and Al4C3 During Thixomolding of AZ91 Magnesium Alloy Conducted in CO2

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Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

Abstract

MgO and Al4C3 compounds were produced in situ by reaction of CO2 with AZ91 alloy at semi-solid temperature range. Using modified magnesium injection molding, reactive carbon dioxide was introduced to hot zone of cylinder to conduct controlled oxidation reaction with partially melted Mg alloy . In result, nano-scale native MgO (30–50 nm) and small amount of Al4C3 carbide within eutectic mixture consisted of α(Mg) and β-Mg17Al12 were formed. Apart from eutectic obtained directly from liquid state, proeutectic magnesium solid solution α(Mg)p is crystallized. Homogeneously distributed α(Mg) globular grains (not melted during the process) with size 20–50 μm and volume 8–12% were also visible in the microstructure . Electron beam was aligned along [011] zone axis of MgO and [01-10] of αMg matrix. (11-1) planes of MgO were parallel to (0002) planes of the matrix. Orientation relationship was [011] MgO ║ [01-10] αMg and (11-1) MgO ║ (0002) αMg.

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Acknowledgements

The authors gratefully acknowledge the financial support by the National Centre for Research and Development, Grant No.: LIDER/007/151/L-5/13/NCBR/2014.

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Authors and Affiliations

  1. Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta Str., 30-059, Krakow, Poland

    Ł. Rogal, L. Litynska-Dobrzynska & Bogusław Baran

Authors
  1. Ł. Rogal
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  2. L. Litynska-Dobrzynska
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  3. Bogusław Baran
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Corresponding author

Correspondence to Ł. Rogal .

Editor information

Editors and Affiliations

  1. Pacific Northwest National Laboratory, Richland, WA, USA

    Vineet V. Joshi

  2. The University of Alabama, Tuscaloosa, AL, USA

    J. Brian Jordon

  3. Lund University, Lund, Sweden

    Dmytro Orlov

  4. IND LLC, South Jordan, UT, USA

    Neale R. Neelameggham

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© 2019 The Minerals, Metals & Materials Society

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Rogal, Ł., Litynska-Dobrzynska, L., Baran, B. (2019). TEM Studies of In Situ Formation of MgO and Al4C3 During Thixomolding of AZ91 Magnesium Alloy Conducted in CO2. In: Joshi, V., Jordon, J., Orlov, D., Neelameggham, N. (eds) Magnesium Technology 2019. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-05789-3_7

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