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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1335| Study of Al2O3 Nanofibers Dispersed in Al Matrix by EELS and Calculations Ab Initio | |
| VERONICA GALLEGOS OROZCO AUDEL SANTOS BELTRAN FRANCISCO PARAGUAY DELGADO FRANCISCO ESPINOSA MAGAÑA | |
| Acceso Abierto | |
| Sin Derechos Reservados | |
| Al2O3 | |
| The necessity for improving the mechanical properties of aluminum alloys has motivated the study of Al base composites [1]. Mechanical Alloying process is employed to produce hardened composites to introduce reinforcing particles; this process is able to produce several phases including supersaturated solid solutions, metastable phases, amorphous phases, as well as reinforced metal-particle composites [2]. Using techniques like Electron Energy Loss Spectroscopy (EELS) and Transmission Electron Microscopy, it is possible to characterize this kind of materials. Recently, very important advances have been achieved in the description of the crystalline solid electronic structure through numerical calculations. There is a great diversity of available codes for DFT calculations, among them are the CASTEP code (pseudopotentials) and WIEN2k code, two available commercial programs that offer the possibility of ELNES calculations. ELNES provides details of the atomic local environment, coordination, bond type and valence states. The ELNES calculation can be performed with an energy resolution much better than those obtained by experiment. In this work, Al2O3 nanofibers were synthesized using Al powders (99 % pure) and C as raw materials. A mixture of Al powders at 75 wt. % and C powder at 25 wt. % was used to produce the compound. The mixture was mechanically processed in a high energy mill (Spex) for 4h and the product was compacted at ~950 MPa of pressure. The consolidated samples were sintered for 2h at 550°C. The characterization was carried out by Transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS). | |
| 2011 | |
| Memoria de congreso | |
| Inglés | |
| OTRAS | |
| Versión revisada | |
| submittedVersion - Versión revisada | |
| Aparece en las colecciones: | Artículos de Congresos |
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