Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/26067

TitleUse of acoustic energy in the processing of molten aluminium alloys
Author(s)Puga, Hélder
Costa, S.
Barbosa, J.
Pinto, A. M.P.
Ribeiro, S.
KeywordsAluminium
Ultrasonic
Mechanical properties
Ultrasound
Refining
Grain refinement
Processing
Aluminium Alloys
Issue date2013
PublisherTrans Tech Publications
JournalMaterials Science Forum
Abstract(s)During the last years aluminium alloys have been gaining increased acceptance as structural materials in the automotive and aeronautical industries, mainly due to their light weight, good formability and corrosion resistance. However, improvement of mechanical properties is a constant in research activities, either by the development of new alloys or by microstructure manipulation. This presentation focuses a novel effective dynamic methodology to perform microstructural refinement / modification and degassing of light alloys, namely aluminium alloys, by applying acoustic energy to the melts. High intensity acoustic energy significantly improves the microstructure, therefore the mechanical properties of those alloys, avoiding the use of traditional chemically based degassing and refining techniques which are less effective and present significant environmental impact. Ultrasonic (US) vibration has proven to be extremely effective in degassing, controlling columnar dendritic structure, reducing the size of equiaxed grains and, under some conditions, producing globular grains and modifying the eutectic silicon cells in Al-Si alloys. The mechanisms of US processing of aluminium melts are discussed and experimental results on this field are presented.
TypeConference paper
URIhttp://hdl.handle.net/1822/26067
ISBN978-3-03785-493-8
DOI10.4028/www.scientific.net/MSF.730-732.895
ISSN0255-5476
Peer-Reviewedyes
AccessOpen access
Appears in Collections:CIICS - Artigos em revistas de circulação internacional com arbitragem científica
CT2M - Artigos em revistas de circulação internacional com arbitragem científica

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