On the correlation between Fe concentration and the activation energy for superplastic deformation in Zn-22 pct Al
J.A. Montemayor-Aldrete1, J.D. Muñoz-Andrade2* and A. Mendoza-Allende1
1 Instituto de Física, Universidad Nacional Autónoma de México Apartado Postal 20-364, 01000 México, D.F., México.
2 Departamento de Materiales, DCBI Universidad Autónoma Metropolitana Unidad Azcapotzalco, Ave. San Pablo 180, Col. Reynosa-Tamaulipas, 02200 México, D.F.
Recibido el 3 de septiembre de 2001. ]]> Aceptado el 22 de febrero de 2002.
Abstract
For the first time, an expression for the apparent activation energy for superplastic deformation in Zn-22 pct Al doped with Fe impurities, which exhibits in an explicit fashion the Fe-concentration has been obtained. Such expression allows to describe all the experimental data previously reported. The range of Fe-concentration for which the Mohamed's model remains valid is established.
Keywords: Activation energy; superplasticity; threshold stress; segregation.
Resumen
Se presenta una expresión para la energía de activación aparente para la deformación superplástica en Zn-22 pct Al con impurezas de Fe, en la cual por primera vez aparece de manera explícita la concentración de Fe. Esta expresión permite describir todos los datos experimentales previamente reportados. Asimismo, se delimita el intervalo de concentraciones en que sigue siendo posible aplicar el modelo de Mohamed.
Palabras clave: Energía de activación; superplasticidad; esfuerzo umbral; segregación.
PACS: 62.20.Fe; 61.72.Hh; 61.72.Ss.
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