INTECIN   20395
INSTITUTO DE TECNOLOGIAS Y CIENCIAS DE LA INGENIERIA "HILARIO FERNANDEZ LONG"
Unidad Ejecutora - UE
artículos
Título:
Superplastic behavior of AZ31 processed by ECAP
Autor/es:
F. VAGO, H. G. SVOBODA
Revista:
Procedia Materials Science
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2015 vol. 9 p. 590 - 598
Resumen:
Magnesium base alloys have reached an important development as structural materials the last years due to its goodstrength/weight relationship. On the other hand, superplastic forming has also acquired a technological interest in the last time,due to the possibility of achieving complex geometries in only one forming step, with competitive strain rates. In this sense, grainrefining promotes grain boundary sliding mechanism, responsible of superplastic behavior in metallic materials. ECAP (EqualChannel Angular Pressing) processing introduce a severe plastic deformation without modifying the sample geometry, being anefficient way to grain refining. The objective of this work was to study the influence of ECAP processing on the superplasticbehavior of an AZ31 Mg alloy. Samples in ?as cast? conditions were processed by ECAP with 1, 2, 3 and 4 passes. Materialobtained was characterized microstructurally, obtaining grain size and recrystallized fraction, for each condition. Microhardnessmeasurements were done as well as high temperature tension tests for different test temperatures and initial strain rates. Grainrefinement, recrystallized fraction and microhardness increased with the number of ECAP passes. Deformation to fractureimproved with ECAP processing, reaching 250% for 350ºC and 1x10-4 sec-1. Maximum stress decreased with number of passes,temperature and diminishing strain rate.