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Advances in Materials Science and Engineering
Volume 2015 (2015), Article ID 673025, 10 pages
Research Article

Microstructural Characterization of Beryllium Treated Al-Si Alloys

1Département des Sciences Appliquées, Université du Québec à Chicoutimi, Chicoutimi, QC, Canada G7H 2B1
2Mechanical Engineering Department, College of Engineering, Prince Sattam bin Abdulaziz University, Al Kharj 11942, Saudi Arabia

Received 7 August 2015; Accepted 13 September 2015

Academic Editor: Francesco Delogu

Copyright © 2015 M. F. Ibrahim et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The present study was carried out on B356 and B357 alloys using the thermal analysis technique. Metallographic samples prepared from these castings were examined using optical microscopy and FESEM. Results revealed that beryllium causes partial modification of the eutectic Si, similar to that reported for magnesium additions. Addition of 0.8 wt.% Mg reduces the eutectic temperature by ~10°C. During solidification of alloys containing high levels of Fe and Mg, but no Sr, formation of a Be-Fe phase was detected at 611°C, close to that of α-Al. The Be-Fe phase precipitates in script-like form at or close to the β-Al5SiFe platelets. A new reaction, composed of fine particles of Si and π-Fe phase, was observed to occur near the end of solidification in high Mg-, high Fe-, and Be-containing alloys. The amount of this reaction decreased with the addition of Sr. Occasionally, Be-containing phase particles were observed as part of the reaction. Addition of Be has a noticeable effect on decreasing the β-Al5FeSi platelet length; this effect may be enhanced by addition of Sr. Beryllium addition also results in precipitation of the β-Al5FeSi phase in nodular form, which lowers its harmful effects on the alloy mechanical properties.