| Revista: | Materials research |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000312795 |
| ISSN: | 1516-1439 |
| Autors: | Luiggi Agreda, Ney José1 |
| Institucions: | 1Universidad de Oriente, Escuela de Ciencias, Cumaná, Sucre. Venezuela |
| Any: | 2005 |
| Període: | Ene-Mar |
| Volum: | 8 |
| Número: | 1 |
| Paginació: | 31-37 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Nota breve o noticia |
| Enfoque: | Experimental |
| Resumen en inglés | We have studied the phase transformation kinetics occurring in aluminum alloys containing Mn, Mg, and Mn-Mn-Mg by means of electrical resistivity (r) and thermoelectric power (DS). The alloy samples were annealed isochronally at temperatures ranging from ambient temperature to 615 °C. Both r and DS allowed the separation of several stages of transformation associated to either the precipitation or dissolution of phases that occur during the annealing process. The alloys containing Mn show a strong DS growth or a marked r drop between 450 °C and 550 °C, linked to the precipitation of the Mn-rich Al6(Mn,FE) equilibrium phase. While the Mg in aluminum generates a series of maxima and minima of both r and DS associated to the pre-established precipitation sequence: GP Zones ® b' phase ® b phase, a combination of effects ensues in the Mn- and Mg-containing alloys, the Mg effect being enhanced at temperatures below 350 °C and that of the Mn striking the same behavior above such temperature. Our study ascertains that the Mg speeds up the precipitation and lowers the activation energy of the Al6(Mn,Fe) phase, the latter having been evaluated by the multiple temperature method |
| Disciplines | Ingeniería, Física y astronomía |
| Paraules clau: | Ingeniería mecánica, Ingeniería metalúrgica, Física atómica y molecular, Teoría cinética y plasmas, Aluminio, Aleaciones, Resistividad eléctrica, Termoelectricidad |
| Keyword: | Engineering, Physics and astronomy, Mechanical engineering, Metallurgical engineering, Atomic and molecular physics, Kinetic theory and plasma, Aluminum, Alloys, Electrical resistivity, Thermoelectricity |
| Text complet: | Texto completo (Ver HTML) |
