TEM microstructural characterization of melt-spun aged Al-6Si-3Cu-xMg alloys
Por:
López I.A., Zepeda C.M., González Reyes J.G., Flores A.M., Rodríguez J.S., Gómez L.B.
Publicada:
1 ene 2007
Resumen:
Three Al-6Si-3Cu-xMg alloys (x = 0.59, 3.80 and 6.78 wt.%) were produced using melt-spinning. As-melt-spun ribbons were aged at 150, 180 and 210 °C for times between 0.05 and 100 h. Microstructural changes were examined using transmission electron microscopy (TEM) and microhardness was measured. TEM analysis of the as-melt-spun alloys revealed 5 nm nanoparticles and larger particles (50 nm) composed of Al2Cu (?) for the 0.59% Mg alloy and Al5Cu2Mg8Si6 (Q) for 3.80% and 6.78% Mg alloys. Silicon solid solubility was extended to 9.0 at.% and Mg in solid solution reached 6.7 at.%. After aging treatments the 6.78% Mg alloy exhibited the most significant increase in microhardness, reaching 260 kg/mm2. TEM analysis of aged specimens also showed ? and Q phase (5-20 nm nanoparticles and 35-40 nm particles). The combination of the volume fraction and size of the particles plays an important role in microhardness variation. © 2006 Elsevier Inc. All rights reserved.
Filiaciones:
López I.A.:
Instituto de Investigaciones Metalúrgicas, UMSNH, Edificio U, CP 58000, Morelia, Michoacán, Mexico
Zepeda C.M.:
Instituto de Investigaciones Metalúrgicas, UMSNH, Edificio U, CP 58000, Morelia, Michoacán, Mexico
González Reyes J.G.:
Instituto de Investigaciones en Materiales, UNAM, Ciudad Univ. Apdo. Postal 70-360, 04510 México, DF, Mexico
Flores A.M.:
Instituto de Investigaciones Metalúrgicas, UMSNH, Edificio U, CP 58000, Morelia, Michoacán, Mexico
Rodríguez J.S.:
Instituto de Investigaciones Metalúrgicas, UMSNH, Edificio U, CP 58000, Morelia, Michoacán, Mexico
Gómez L.B.:
Instituto de Investigaciones Metalúrgicas, UMSNH, Edificio U, CP 58000, Morelia, Michoacán, Mexico
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