Accessible Requires Authentication Published by De Gruyter June 5, 2016

Dry wear behavior of cooling-slope-cast hypoeutectic aluminum alloy

Nguyen Van Thuong, Hussain Zuhailawati, Abu Seman Anasyida, Tran Duc Huy and Brij Kumar Dhindaw

Abstract

This study investigated the effect of use of a cooling slope on the microstructure, hardness and wear behavior of Al-7Si-Mg alloy. The Al-7Si-Mg alloy was cast with and without a cooling slope at a pouring temperature of 640 °C. Examination with optical and electron microscopes showed that the microstructure of cast samples using the cooling slope comprised fine and globular primary α-Al phase with homogeneous distribution of eutectic phase, while conventionally cast samples featured coarse and dendritic primary α-Al phase. The wear resistance of the cast sample was significantly better with cooling slope casting. The wear mechanism was found to be a combination of adhesion, delamination, oxidation and abrasive wear for both cooling slope- and conventionally cast samples. The wear mechanisms of cast samples both with and without cooling slope are similar and follow Archard's law. The cooling slope-cast samples with fine and globular α-Al phase, high hardness and low specific wear rate (K′) showed the highest wear resistance of 10.08 × 10−5 mm3 N−1 m−1.


*Correspondence address, Prof. Dr. Zuhailawati Hussain, School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia, Tel.: +60 4-5995258, Fax: +60 4-5941011, E-mail:

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Received: 2015-07-29
Accepted: 2016-01-12
Published Online: 2016-06-05
Published in Print: 2016-06-10

© 2016, Carl Hanser Verlag, München