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Influence of lanthanum on solidification, microstructure, and mechanical properties of eutectic Al-Si piston alloy

Ahmad, R. and Asmael, M. B. A. (2016) Influence of lanthanum on solidification, microstructure, and mechanical properties of eutectic Al-Si piston alloy. Journal of Materials Engineering and Performance, 25 (7). pp. 2799-2813. ISSN 10599495

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Abstract

The effects of Lanthanum (La) concentration on the solidification parameters of the a-Al, Al-Si, and Al-Cu phases and on the microstructure, tensile, and hardness properties of eutectic Al-Si-Cu-Mg alloy were systematically investigated. The solidification parameters were examined using computer-aided cooling curve thermal analysis (CA-CCTA). The cooling curve and microstructure analysis showed that La altered the Si structure. The nucleation and growth temperatures of eutectic Si decreased when 0.3 wt.% La was added, and a high depression temperature was obtained with 1.0 wt.% La. High amounts of La considerably modified the Si structure and decreased the area and aspect ratio by 69.9 and 51%, respectively. The thermal analysis result recorded a faster freezing time with the La addition and a 36% alteration in the secondary dendrite arm spacing. Two secondary or ternary La-rich intermetallic phases were formed with needle- and plate-like structures. Furthermore, the mechanical properties were investigated by hardness and tensile tests with different La concentrations. The addition of small amounts of La (0.1 wt.%) significantly improved the ultimate tensile strength and quality index of the Al-Si-Cu-Mg alloy. In addition, the hardness value of Al-11Si-Cu increased by 7-8% with the increasing amount of La added.

Item Type: Article
Uncontrolled Keywords: alloys; lanthanum; mechanical properties; microstructure; thermal analysis
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 04:01
Last Modified: 02 Jul 2018 04:01
URI: http://eprints.uthm.edu.my/id/eprint/8767
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