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The Morphology and Distribution of Al8Mn5 in High Pressure Die Cast AM50 and AZ91

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Magnesium Technology 2018 (TMS 2018)

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Abstract

The morphology and distribution of Al8Mn5 is studied in AM50 and AZ91 produced by hot and cold chamber high pressure die casting (HPDC). It is found that, in HPDC, primary Al8Mn5 particles take a wide range of morphologies within the same casting spanning from faceted polyhedra to weakly-faceted dendrites. These different morphologies exist across the whole cross-section without any clear trend in morphology versus radial position. A comparison with Al8Mn5 in samples solidified at low cooling rate suggests that the larger polyhedral particles are externally solidified crystals (ESCs) that nucleate and grow in the shot chamber analogous to αMg ESCs, and that the dendritic Al8Mn5 nucleated and grew at high cooling rate in the die cavity.

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Acknowledgements

Financial support from EPSRC (UK) under grant number EP/N007638/1 is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Materials, Imperial College London, London, SW7 2AZ, UK

    G. Zeng & C. M. Gourlay

  2. Brunel Centre for Advanced Solidification Technology (BCAST), Institute of Materials & Manufacturing, Brunel University London, Uxbridge, UB8 3PH, UK

    X. Zhu & S. Ji

Authors
  1. G. Zeng
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  2. X. Zhu
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  3. S. Ji
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  4. C. M. Gourlay
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Corresponding authors

Correspondence to G. Zeng or C. M. Gourlay .

Editor information

Editors and Affiliations

  1. Lund University, Lund, Sweden

    Dmytro Orlov

  2. Pacific Northwest National Laboratory, Richland, Washington, USA

    Vineet Joshi

  3. Arizona State University, Tempe, Arizona, USA

    Kiran N. Solanki

  4. IND LLC, South Jordan, Utah, USA

    Neale R. Neelameggham

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© 2018 The Minerals, Metals & Materials Society

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Zeng, G., Zhu, X., Ji, S., Gourlay, C.M. (2018). The Morphology and Distribution of Al8Mn5 in High Pressure Die Cast AM50 and AZ91. In: Orlov, D., Joshi, V., Solanki, K., Neelameggham, N. (eds) Magnesium Technology 2018. TMS 2018. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-72332-7_21

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