Microstructural development of electron beam processed Al-3Ti-1Sc alloy under different electron beam scanning speeds

Yu, P, Yan, M, Tomus, D, Brice, C, Bettles, C, Muddle, B and Qian, M 2018, 'Microstructural development of electron beam processed Al-3Ti-1Sc alloy under different electron beam scanning speeds', Materials Characterization, vol. 143, pp. 43-49.


Document type: Journal Article
Collection: Journal Articles

Title Microstructural development of electron beam processed Al-3Ti-1Sc alloy under different electron beam scanning speeds
Author(s) Yu, P
Yan, M
Tomus, D
Brice, C
Bettles, C
Muddle, B
Qian, M
Year 2018
Journal name Materials Characterization
Volume number 143
Start page 43
End page 49
Total pages 7
Publisher Elsevier
Abstract A systematic study has been made of the microstructural development in as-cast 30mm thick Al-3Ti-1Sc (wt%) plate samples that were processed by electron beam (EB) melting at different scanning speeds of 3, 5, 8, 12, 15 and 20mm/s. The composition of the alloy is designed to capitalize on the potential for significantly extended solubility values of both Sc and Ti in Al when cooled at high cooling rates. The resulting microstructures are characterised using transmission electron microscopy (TEM) and other analytical means, assisted with Thermo-Calc predictions and Vicker's microhardness measurements. EB scanning speed plays a key role in determining the phase formation and microstructural development in the Al-3Ti-1Sc alloy when the beam is applied an accelerating voltage of 50kV and a current of 30μA. The major microstructural features in the re-solidified zone include (i) the formation of the primary tetragonal Al 3 (Ti,Sc) phases and their retention or subsequent transformation to stable cubic Al 3 (Ti,Sc) phases; (ii) the complete suppression of the primary tetragonal Al 3 (Ti,Sc) phases at the scanning speed of 20mm/s; and (iii) the formation of cubic Al 3 (Ti,Sc) precipitates in the α(Al) matrix supersaturated with both Sc and Ti. These experimental findings are informative for both EB processing of Al-Ti-Sc alloys and the design of new Al alloys for additive manufacturing processes.
Subject Metals and Alloy Materials
Keyword(s) Additive Manufacturing
Aluminium alloys
Electron beam Melting
Scandium
Titanium
DOI - identifier 10.1016/j.matchar.2017.09.005
Copyright notice © 2017 Elsevier Inc. All rights reserved.
ISSN 1044-5803
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