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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1266| Recycled Al Reinforced with Oxide Nanoparticles Produced by Stir-Casting Method | |
| AUDEL SANTOS BELTRAN VERONICA GALLEGOS OROZCO MIRIAM MORAIMA SANTOS BELTRAN FRANCISCO JAVIER BALDENEBRO LOPEZ CYNTHIA DEISY GOMEZ ESPARZA | |
| Acceso Abierto | |
| Sin Derechos Reservados | |
| Oxide nanoparticles | |
| Aluminum alloys reinforced with hard nanoparticles named Metal Matrix Nanocomposites (MMNCs) are very attractive in many applications in the industry, this kind of materials exhibit improved mechanical properties with relatively low contents of reinforcement. Automotive and aerospace industries are demanding these composites for critical applications taking into account their low density and high temperature resistance characteristics. MMNC’s are materials reinforced with hard particles (e.g. oxides and nitrides) with size ranging from 10 nm to 100 nm. In the present work, nanocomposites based aluminum with hard nanoparticles of TiO2 and CeO2 were fabricated by combining two techniques such as mechanical milling and the stir-casting method. Compared to other routes, melt stirring process has some important advantages, e.g., the wide selection of materials, better matrix–particle bonding, easier control of matrix structure, simple and inexpensive processing, flexibility and applicability to large quantity production and excellent productivity for near-net shaped components [1,2]. Nanoparticles and metallic powders, in the weight ratio of Recycled Al/nanoparticles = 3, were separately milled using a Spex ball mill in uncontrolled atmosphere during 2h. The device and milling media used were made from hardened steel. The milling ball to powder weight ratio was set to 5:1. Consolidated samples were added into molten recycled Al using a resistance furnace equipped with a graphite stirring system. Each cylinder was hot extruded in a direct extrusion system at 550 °C. The specimens in both as-milled and as-sintered conditions were studied by scan electron microscopy (SEM) and atomic force microscopy (AFM). The SEM bright-field image (see Fig. 1a) shows the microstructure of the Al-TiO2 nanocomposite, the inset shows a close up image of the TiO2 nanoparticles dispersed into the recycled Al matrix; these particles are in the size range of about 80 to 100 nm. Fig. 1b shows the AFM topography image of the Al-TiO2 composite after the hot extrusion process, the image reveal a homogeneous crystallite size distribution of about 50 to 100 nm. The inset shows the profile of the crystallite. | |
| 2015 | |
| Memoria de congreso | |
| Inglés | |
| OTRAS | |
| Versión revisada | |
| submittedVersion - Versión revisada | |
| Aparece en las colecciones: | Artículos de Congresos |
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| 2015 Recycled Al Reinforced with Oxide Nanoparticles Produced by Stir-Casting Method.pdf | 389.37 kB | Adobe PDF | Visualizar/Abrir |