Consideraciones físicas en el procesamiento de metales reforzados por rheocasting
DOI:
https://doi.org/10.17533/udea.redin.326369Keywords:
Rheocasting, procesado semisólido, metales reforzados, reología, mojabilidad.Abstract
El procesamiento por rheocasting de metales reforzados fue analizado en este trabajo utilizando consideraciones físicas y algunas fisicoquímicas. Para el análisis, se divide la síntesis del material en tres etapas: formación de glóbulos por cizallamiento mecánico, desaglomeración de los glóbulos y alimentación de partículas de refuerzo.
Se observa que las irreversibilidades internas en la primera etapa están asociadas a la evolución microestructural del metal debida al corte. En la segunda etapa el material presenta un comportamiento tixotrópico, el cual es más o menos reversible. Durante la tercera etapa, se debe invertir trabajo para la inmersión del refuerzo y éste puede calcularse a partir de las componentes inerciales, de tensión superficial y de flotación del reforzante.
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