中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 24 No. 1 January 2014 |
（1. Department for Materials and Metallurgy, Faculty of Natural Science and Engineering,
University of Ljubljana, A？ker？eva 12, SI-1000 Ljubljana, Slovenia;
2. University of Maribor, Faculty of Mechanical Engineering, Smetanova 17, SI-2000 Maribor, Slovenia）
Abstract:The effect of Ce addition on the morphology of the α(Al)-Al2Cu eutectic in Al-Si-Cu alloy was investigated using thermal analysis, light microscopy, scanning electron microscopy, focused ion beam and energy dispersive analysis. The results show that the eutectic α(Al)-Al2Cu forms within small space between dendrites, silicon and AlSiFeMn plates. Eutectic Al2Cu is not lamellar but degenerated. However, Al2Cu in Ce-modified alloys is more compact. Ce partially dissolves in Al2Cu, which is a viable reason for the formation of coarser Al2Cu. The addition of Ce also increases the microhardness of the α(Al)-Al2Cu eutectic by almost 10% compared with the basic Al-Si-Cu alloy.
Key words: Al-Si-Cu alloy; cerium; eutectic; microstructure; focused ion beam
