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Research Letters in Materials Science
Volume 2008, Article ID 737546, 5 pages
Research Letter

TEM Nanostructural Study of Al-6Si-3Cu- 𝑥 Mg Melt-Spun Ribbons

1Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México (UNAM) Circuito Exterior s/n, Cd. Universitaria, Del. Coyoacán CP 04510 México, DF, Mexico
2Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, CP 58000, Michoacán, Mexico

Received 29 February 2008; Accepted 10 April 2008

Academic Editor: Martin Crimp

Copyright © 2008 Ismeli Alfonso López 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.


Three quaternary Al-6Si-3Cu-xMg (x = 0.59, 3.80, and 6.78 wt.%) alloys were produced by melt-spun and characterized using X-ray diffractometry (XRD), transmission electron microscopy (TEM), and microhardness techniques. Obtained second phases were A l 2 C u ( 𝜃 ) for the alloy with 0.59% Mg and A l 5 C u 2 M g 8 S i 6 (Q) for the alloys with 3.80 and 6.78% Mg. These phases are present as 30–50 nm or as 5–10 nm nanoparticles. Alloying elements content in solid solution increased, mainly for Si and Mg. The high alloying elements content in solid solution and the small 𝛌 -Al cell size for melt-spun alloys leads to microhardness values about 2 times higher than those of ingot counterparts. The microhardness increase for melt-spun alloys with 3.80 and 6.78% Mg depends on Mg content in solid solution.