Deakin University
Browse

File(s) not publicly available

Optimised composition and process design to develop sc-enhanced wrought al-si alloys

chapter
posted on 2019-01-01, 00:00 authored by J Dumbre, T Langan, Thomas DorinThomas Dorin, N Birbilis
© 2019, The Minerals, Metals & Materials Society. 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.

History

Title of book

Light Metals 2019

Series

The Minerals, Metals & Materials Series

Chapter number

179

Pagination

1431 - 1438

Publisher

Springer

Place of publication

Berlin, Germany

ISSN

2367-1181

eISSN

2367-1696

ISBN-13

9783030058630

Edition

1

Language

eng

Publication classification

B1 Book chapter

Extent

208

Editor/Contributor(s)

Corleen Chesonis