Reduction in secondary dendrite arm spacing in cast eutectic Al–Si piston alloys by cerium addition
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- 作者：R. Ahmad ; M. B. A. Asmael ; N. R. Shahizan…
- 关键词：eutectic alloys ; aluminum silicon alloys ; cerium ; microstructure ; dendrites ; spacing ; mechanical properties
- 刊名：International Journal of Minerals, Metallurgy, and Materials
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：24
- 期：1
- 页码：91-101
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Materials Science, general; Metallic Materials; Characterization and Evaluation of Materials; Ceramics, Glass, Composites, Natural Materials; Surfaces and Interfaces, Thin Films; Tribology, Corrosion
- 出版者：University of Science and Technology Beijing
- ISSN：1869-103X
- 卷排序：24
文摘
The effects of Ce on the secondary dendrite arm spacing (SDAS) and mechanical behavior of Al–Si–Cu–Mg alloys were investigated. The reduction of SDAS at different Ce concentrations was evaluated in a directional solidification experiment via computer-aided cooling curve thermal analysis (CA‒CCTA). The results showed that 0.1wt%–1.0wt% Ce addition resulted in a rapid solidification time, Δts, and low solidification temperature, ΔTS, whereas 0.1wt% Ce resulted in a fast solidification time, Δta–Al, of the α-Al phase. Furthermore, Ce addition refined the SDAS, which was reduced to approximately 36%. The mechanical properties of the alloys with and without Ce were investigated using tensile and hardness tests. The quality index (Q) and ultimate tensile strength of (UTS) Al–Si–Cu–Mg alloys significantly improved with the addition of 0.1wt% Ce. Moreover, the base alloy hardness was improved with increasing Ce concentration.