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Direct thermal method of Aluminium 7075

Ahmad, Asnul Hadi, Naher, Sumsun orcid logoORCID: 0000-0003-2047-5807 and Brabazon, Dermot orcid logoORCID: 0000-0003-3214-6381 (2014) Direct thermal method of Aluminium 7075. Advanced Materials Research, 939 . pp. 400-408. ISSN 1662-8985

Abstract
The evolution of microstructure affect from different pouring temperatures and holding times using a direct thermal method is presented in this paper. The direct thermal method is one of the thermal techniques which are used to produce semi-solid metal feedstock. In this experimental work, aluminium 7075 alloy was used. The experiments were carried out by processing a sample with a 0.7 °C/s cooling rate to evaluate the formation of the microstructure. In direct thermal method experiment, a molten 7075 was poured into a cylindrical copper mould at different pouring temperatures of 680 °C and 660 °C meanwhile the holding time of 20 s, 40 s and 60 s before quenched into room temperature water. The sample processed by the cooling rate of 0.7 °C/s produced a large microstructure. The formation of a spheroidal microstructure was obtained with the combination of a suitable pouring temperature and holding time. The pouring temperature of 665 °C and the holding time of 60 s produced a finer and uniform microstructure that is suitable for semi-solid feedstock.
Metadata
Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:Aluminium 7075; Direct Thermal Method; Semi-solid Metal; Pouring Temperature; Holding Time; Fraction 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:Trans Tech Publications
Official URL:http://dx.doi.org/10.4028/www.scientific.net/AMR.9...
Copyright Information:© 2014 Trans Tecth
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:20228
Deposited On:25 Sep 2014 12:39 by Fran Callaghan . Last Modified 18 May 2023 13:12
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