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Effect of ytterbium addition on microstructure and hardness of Al-6.5Si-1Zn secondary cast alloy

Ahmad, R. and Asmael, M. B. A. and Amzar, M. (2016) Effect of ytterbium addition on microstructure and hardness of Al-6.5Si-1Zn secondary cast alloy. ARPN Journal of Engineering and Applied Sciences, 11 (16). pp. 10123-10127. ISSN 18196608

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Abstract

The effects of Yb additions (0.3 wt.% and 0.8 wt.%) on Al-6.5Si-1Zn cast alloy was investigated using optical microscopy (OM) and scanning electron microscopy (SEM/EDS) analysis. The purpose of this research is to investigate the variations occurred in Si morphology and the formation of intermetallics with different Yb additions, as well as their effect on hardness value. The experimental results indicates that the Yb affected the silicon eutectic morphology of Al- 6.5Si-1Zn secondary alloy, when 0.8 wt.% was added to the alloy and the coarse plate Si was modified into a fine fibrous structure. Two kinds of Yb-rich intermetallics were found, such as AlSiYb and AlSiYbMg. The hardness measurements revealed that the hardness values of base alloy were higher with the Yb addition.

Item Type: Article
Uncontrolled Keywords: Aluminum cast alloys; ytterbium; microstructure; hardness
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Divisions: Faculty of Mechanical and Manufacturing Engineering > Department of Manufacturing and Industrial Engineering
Depositing User: Mr. Mohammad Shaifulrip Ithnin
Date Deposited: 02 Jul 2018 04:08
Last Modified: 02 Jul 2018 04:08
URI: http://eprints.uthm.edu.my/id/eprint/8779
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