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Injection tests and effect on microstructure and properties of aluminium 7075 direct thermal method feedstock billets

Ahmad, Asnul Hadi, Naher, Sumsun orcid logoORCID: 0000-0003-2047-5807 and Brabazon, Dermot orcid logoORCID: 0000-0003-3214-6381 (2014) Injection tests and effect on microstructure and properties of aluminium 7075 direct thermal method feedstock billets. Key Engineering Materials, 611-61 . pp. 1637-1644. ISSN 1662-9795

The success of semi-solid metal forming is dependent on a globular solid grain formation within a liquid phase. This paper presents experimental works concerning semisolid metal processing of aluminium 7075 feedstock billets which were produced by direct thermal method. The flowability of feedstock billets was evaluated by an injection test processing unit. The feedstock billets were heated to a temperature of 620 oC by using a box furnace before transferred into a forming die. The formed feedstock billet was removed from the forming die after it was cooled to ambient temperature. Several analyses were conducted on the formed feedstock billets including dimensional measurement and microstructure analysis. The results show that the feedstock billets which contained the highest amount of free secondary phase were most successfully formed. Microstructure analysis results also revealed the formation of more globular and larger a-Al solid grains in the same feedstock billets. In this experimental work, the feedstock billets with higher amount of secondary (liquid) phase had a significant effect on formability. It is concluded that in order to achieve successful formability of the direct thermal method feedstock billets, the billets need to a have higher secondary phase content. Thus, important preparation methods of feedstock billets were characterised in order to allow for SSM processing.
Item Type:Article (Published)
Uncontrolled Keywords:Aluminium 7075; Thermal properties; Solid grain formation
Subjects:Engineering > Materials
Engineering > Mechanical engineering
DCU Faculties and Centres:Research Institutes and Centres > Advanced Processing Technology Research Centre (APTRC)
DCU Faculties and Schools > Faculty of Engineering and Computing > School of Mechanical and Manufacturing Engineering
Official URL:http://dx.doi.org/ 10.4028/www.scientific.net/KEM....
Copyright Information:© 2014 Scientific.net
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:20546
Deposited On:02 Apr 2015 10:12 by Fran Callaghan . Last Modified 18 May 2023 13:11

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