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Título: | ESTUDIO DE LA DEFORMACIÓN DE ALEACIONES SUPERPLÁSTICAS DE ALUMINIO MEDIANTE ANÁLISIS DE TEXTURAS |
Autor: | Pérez Prado, María Teresa CSIC ORCID | Director: | González-Doncel, Gaspar; Ruano Mariño, Oscar Antonio | Palabras clave: | Deformation superplastic Aleaciones de aluminio Texturas de aleaciones de aluminio Recristalización |
Fecha de publicación: | 1998 | Editor: | Universidad Complutense de Madrid CSIC - Centro Nacional de Investigaciones Metalúrgicas (CENIM) |
Resumen: | In this work the deformation mechanisms which operate in several superplastic aluminum alloys during tensile straining have been investigated by means of texture analysis via x-ray diffraction (macrotexture) and electron diffraction (microtexture). Tensile tests have been performed at different temperatures and strain rates with the aim of studying the deformation behavior outside and within the superplastic regime. Special attention has been paid to the alloy Al-5%Ca-5%Zn (fine-grained alloy, d ≈ 2-3 μm, with 20%vol. of second phase, Al3CaZn) and the main conclusions obtained have been generalized to other superplastic aluminum alloys: 2090, 8090, Supral 2004 and ski5083. The main original contribution of this work is the following: it has been found that in some superplastic aluminum alloys crystallographic slip operates even under optimum superplastic conditions, where this mechanism competes with grain boundary sliding. This behavior seems to be characteristic of alloys which recrystallize in a continuous way. As such, this observation could explain why "continuous" alloys undergo superplastic deformation at relatively high strain rates and are therefore extremely interesting for their potential applications in industry. Alloys which recrystallize in a discontinuous way follow the pattern of behavior traditionally accepted for superplastic alloys. | URI: | http://hdl.handle.net/10261/85379 |
Aparece en las colecciones: | (CENIM) Tesis |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
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Tesis Teresa.pdf | 4,78 MB | Adobe PDF | Visualizar/Abrir |
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