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Effect of temporal thermal field on quality of semi-solid metal formed components

Ahmad, Asnul Hadi (2015) Effect of temporal thermal field on quality of semi-solid metal formed components. PhD thesis, Dublin City University.

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Abstract

This thesis presents an investigation of the effect of the semi-solid processing parameters on aluminium alloy 7075. In particular, this thesis focuses on the effect of the temporal thermal fields. Thermal analysis (TA) was initially performed in order to determine suitable processing conditions and understand the relationship between fraction solid and temperature. A specially designed chamber was used to achieve the cooling rates of 0.13 °C/s and different cooling medium were used to replicate the cooling rates of 0.32 °C/s, 0.36 °C/s and 0.39 °C/s. Different cooling rates had a marginal effect on the liquidus, eutectic and solidus phase change temperatures. The coherency point temperatures were also found to be weakly dependent on the cooling rates within the range investigated within this work. The fraction solid was however found to be strongly dependent on temperature. At temperatures higher than the coherency point (approximately 0.20

Item Type:Thesis (PhD)
Date of Award:March 2015
Refereed:No
Supervisor(s):Brabazon, Dermot
Uncontrolled Keywords:Temporal thermal fields
Subjects:Engineering > Materials
Engineering > Mechanical engineering
Engineering > Production 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
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 License. View License
Funders:Malaysian Government
ID Code:20413
Deposited On:14 Apr 2015 10:36 by Dermot Brabazon . Last Modified 19 Jul 2018 15:05

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