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The effect of direct thermal method, temperature and time on microstructure of a cast aluminium alloy

Ahmad, Asnul Hadi, Naher, Sumsun orcid logoORCID: 0000-0003-2047-5807 and Brabazon, Dermot orcid logoORCID: 0000-0003-3214-6381 (2014) The effect of direct thermal method, temperature and time on microstructure of a cast aluminium alloy. Materials and Manufacturing Processes, 29 (9). pp. 134-139. ISSN 1532-2475

Abstract
The direct thermal method is used for the creation of globular microstructures suitable for semi-solid metal forming. In this paper both simulation and experimental results using direct thermal method are presented. ProCAST® software was used to estimate temperature distribution inside the aluminium billet. In validation work, molten aluminium A356 was poured into metallic copper tube moulds and cooled down to the semi-solid temperature before being quenched in water at room temperature. The effect of pouring temperatures of 630°C, 650°C, 665°C, 680°C and holding times of 45s and 60s on the microstructure of aluminium A356 alloy were investigated. The simulation results showed that the average temperature rate within the copper mould, from initial pouring temperature to just before quenching, was approximately 1°C/s. Examination of the solidified microstructures showed that the microstructure was more spherical when lower pouring temperatures and holding periods were used. From the micrographs it was found that the most globular and smallest structures were achieved at processing parameters of 630°C and 45s.
Metadata
Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:Aluminium; A356; Direct Thermal Method; Pouring Temperature; Holding Time; Semi-Solid
Subjects:Engineering > Materials
Engineering > Mechanical engineering
DCU Faculties and Centres:Research Initiatives and Centres > Advanced Processing Technology Research Centre (APTRC)
DCU Faculties and Schools > Faculty of Engineering and Computing > School of Mechanical and Manufacturing Engineering
Publisher:Taylor & Francis
Official URL:http://dx.doi.org/10.1080/10426914.2013.822980
Copyright Information:This is an electronic version of an article published in Materials and Manufacturing Processes. This article is available online at: http://www.tandfonline.com/doi/abs/10.1080/10426914.2013.822980#.U3Nw9_kgCSo
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:19955
Deposited On:14 May 2014 13:41 by Fran Callaghan . Last Modified 20 Sep 2018 08:48
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