Effect of hot extrusion parameters on microhardness and microstructure in direct recycling of aluminium chips [Einfluss von Warmstrangpress-Parametern auf die Mikrohärte und das Gefüge beim Wiederverwerten von Aluminiumspänen]

Rady, Mohammed Hussien and Mustapa, Mohammad Sukri and Harimon, Mohd Azhar and Ibrahim, Mustaffa R. and Shamsudin, S. and Lajis, Mohd Amri and Wagiman, Abdullah and Msebawi, Muntadher S. and Yusof, Farazila (2019) Effect of hot extrusion parameters on microhardness and microstructure in direct recycling of aluminium chips [Einfluss von Warmstrangpress-Parametern auf die Mikrohärte und das Gefüge beim Wiederverwerten von Aluminiumspänen]. Materialwissenschaft und Werkstofftechnik, 50 (6). pp. 718-723. ISSN 0933-5137

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Official URL: https://doi.org/10.1002/mawe.201800214

Abstract

Direct hot extrusion is an alternative process for recycling aluminium without melting the scrap. It utilizes low energy and is environmental friendly. This paper reports the microhardness and microstructure of aluminium alloy chips when subjected to various settings of preheating temperature and preheating time in hot extrusion process. Three values of preheating temperature are taken as 450 °C, 500 °C, and 550 °C. On the other hand, three values of preheating time were chosen (1 h, 2 h, 3 h). The influences of the process parameters (preheating temperature and time) are analyzed using design of experiments approach whereby full factorial design with center point analysis are adopted. The total runs are 11 and they comprise of two factors of full factorial design with 3 center points. The responses are microhardness and microstructure. The results show that microhardness increases with the decrease of the preheating temperature. The results also show that the preheating temperature is more important to be controlled rather than the preheating time in microhardness analyses. The profile extrudes at 450 °C and 1 hour has gained the optimum microhardness and it can be concluded that setting temperature at 550 °C for 3 hours results in the highest responses for average grain sizes in analysis of microstructure. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

Item Type: Article
Uncontrolled Keywords: Aluminum alloy; design of experiment; shot extrusion; microhardness; microstructure
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TS Manufactures
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 10 Feb 2020 07:27
Last Modified: 10 Feb 2020 07:27
URI: http://eprints.um.edu.my/id/eprint/23717

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