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2019 | OriginalPaper | Chapter

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

Authors : Jayshri Dumbre, Timothy Langan, Thomas Dorin, Nick Birbilis

Published in: Light Metals 2019

Publisher: Springer International Publishing

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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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previous chapter Grain Refinement of Al4CuTi Based Alloy with Zr, Sc, Er and TiB2

next chapter Developments in Aluminum-Scandium-Ceramic and Aluminum-Scandium-Cerium Alloys

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Title: Optimised Composition and Process Design to Develop Sc-Enhanced Wrought Al-Si Alloys
Authors: Jayshri Dumbre
Timothy Langan
Thomas Dorin
Nick Birbilis
Publisher: Springer International Publishing
Book: Light Metals 2019
Print ISBN: 978-3-030-05863-0

Electronic ISBN: 978-3-030-05864-7

Copyright Year: 2019
DOI: https://doi.org/10.1007/978-3-030-05864-7_179

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