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Light Metals 2019 pp 1431–1438Cite as

Optimised Composition and Process Design to Develop Sc-Enhanced Wrought Al-Si Alloys

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

Abstract

In a number of aluminium (Al ) alloys to date, scandium (Sc) additions have revealed a significant and beneficial effect on strengthening, even when added in small quantities. However, the strengthening response of the ternary Al -Si-Sc alloy system has been hampered by an apparent unfavourable interaction between silicon (Si) and Sc; forming the deleterious V-phase (AlSc2Si2) and thus limiting the allowable Si-content to ~0.15 wt.%. In this study, phase diagrams were calculated using CALPHAD and utilised to design Al -Si-Sc alloy compositions and heat treatment parameters. The Al -Si-Sc alloys were processed using a conventional route of wrought aluminium semi-products. A hardness improvement of up to 30% was achieved for the alloys containing Si as high as 0.8 wt.% in the F-temper. The improved hardness was mainly attributed to the homogeneously distributed, coherent, (Al ,Si)3Sc nano-dispersoids in the α-Al matrix formed during a low temperature annealing treatment and retained in the F-temper condition.

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Acknowledgements

The authors acknowledge the use of facilities within the Monash Centre for Electron Microscopy. The MGS (Monash Graduate Scholarship), IMPRS (International Monash Postgraduate Research Scholarship) for the financial support required to conduct this work. The authors would like to acknowledge Clean TeQ Ltd. for providing in-kind Al-Sc master alloys.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Monash University, Clayton, VIC, 3800, Australia

    Jayshri Dumbre & Nick Birbilis

  2. Clean TeQ Ltd., Notting Hill, Australia

    Timothy Langan

  3. Institute for Frontier Materials, Deakin University, Geelong, VIC, 3216, Australia

    Thomas Dorin

Authors
  1. Jayshri Dumbre
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  2. Timothy Langan
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  3. Thomas Dorin
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  4. Nick Birbilis
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Corresponding author

Correspondence to Jayshri Dumbre .

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Editors and Affiliations

  1. Metal Quality Solutions, LLC, Avonmore, PA, USA

    Corleen Chesonis

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© 2019 The Minerals, Metals & Materials Society

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Dumbre, J., Langan, T., Dorin, T., Birbilis, N. (2019). Optimised Composition and Process Design to Develop Sc-Enhanced Wrought Al-Si Alloys. In: Chesonis, C. (eds) Light Metals 2019. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-05864-7_179

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