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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1569| EFFECT OF AGE-HARDENING ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF 2024 ALUMINUM ALLOY WITH ALUMINA NANOPARTICLES PRODUCED BY MECHANICAL MILLING. | |
| Humberto Borja Cerda MIGUEL ANGEL NERI FLORES ROBERTO MARTINEZ SANCHEZ | |
| Acceso Abierto | |
| Sin Derechos Reservados | |
| Age-hardening | |
| Mechanical milling and age-hardening were used to obtain 2024 aluminum alloy reinforced with Al2O3 nanoparticles and precipitates. The selected alumina content was 0.0, 1.0, 2.0, 3.0, 4.0 and 5.0 wt.%. Consolidated bulk material were obtained by pressing the milled powder in an uniaxial load, after that sintering and hot extruded using indirect extrusion with a ratio of 1:16 were applied to obtain the final material. The aging heat treatment was applied at 180°C during 4 hours. Structural characterization was carried out by transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM), chemical analysis by characteristic X-ray energy dispersion spectroscopy (EDS), Xray diffraction (XRD) and differential scanning calorimetry (DSC). The best results were obtained with 2.0 wt.% of alumina that is the critical value of ceramic nanoparticle reinforcement in this material. At this point the yield and tensile strength were 243.1 and 498.9 MPa respectively. Some of the formed precipitates were: Al2Cu (θ’), Al2CuMg (S’), Al20Cu2Mn3 (T). With 3.0 wt.% or bigger contents of alumina reinforcement particles the agglomeration takes place, and reduce the effectiveness with the strength in the MMC (Metal Matrix Composite). Some strengthening mechanism acting at the same time were: hardening by dispersion of a second phase, the subsequent effect over the dislocations line movement, grain refinement, thermal mismatch between alumina and aluminum matrix, Orowan looping, and intermetallics crystallization. | |
| 2015 | |
| Memoria de congreso | |
| Inglés | |
| OTRAS | |
| Versión revisada | |
| submittedVersion - Versión revisada | |
| Aparece en las colecciones: | Artículos de Congresos |
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| Fichero | Tamaño | Formato | |
|---|---|---|---|
| 2015-IMRC-EFFECT OF AGE-HARDENING ON MICROSTRUCTURE AND (1).pdf | 1.3 MB | Adobe PDF | Visualizar/Abrir |