Evaluación del efecto de modificadores y refinadores en el comportamiento mecánico y magnitud del rechupe de aleaciones Al-Si-Mg. // Modifier and refiners effect evaluation in the magnitude and mechanical shrinkage behavior of Al-Si-Mg alloys.

Authors

  • V. Lavaert Laboratory Non Ferrous Metallurgy. Gent University. Technologiepark 9. B-9052 Zwijnaarde. Belgium.
  • M. Moors Laboratory Non Ferrous Metallurgy. Gent University. Technologiepark 9. B-9052 Zwijnaarde. Belgium.
  • E. Wettinck Laboratory Non Ferrous Metallurgy. Gent University. Technologiepark 9. B-9052 Zwijnaarde. Belgium.
  • R. Castañeda Facultad de Ingeniería Mecánica.Instituto Superior Politécnico José A. Echeverría (ISPJAE). Departamento de. Tecnología de Construcción deMaquinarias. Calle 127 s/n, CUJAE, Marianao 15, Ciudad Habana, Cuba. Teléfono: 53 7-260 2267, Fax: 53 7-267 7129.
  • L. Goyos Facultad de Ingeniería Mecánica.Instituto Superior Politécnico José A. Echeverría (ISPJAE). Departamento de. Tecnología de Construcción deMaquinarias. Calle 127 s/n, CUJAE, Marianao 15, Ciudad Habana, Cuba. Teléfono: 53 7-260 2267, Fax: 53 7-267 7129.

Abstract

Se estudia la influencia del Na, Sr y Ti y sus combinaciones (Na-Ti y Sr-Na) en las propiedades mecánicas y el rechupe
(superior y lateral) de la aleación hipoeutéctica AlSi7Mg Aunque todos estos elementos y combinaciones tienden a
neutralizar la formación del rechupe substancialmente, el Sr se presenta como el más eficaz para disminuir el rechupe
superior mientras la combinación Na-Ti llevó a la menor formación de rechupe lateral.
Se observó una acción modificadora excelente para 0.02% de Sr y 0.02% de Na, pero a diferencia del Sr, el efecto
modificador del Na comienza a desvanecerse después de 30 min afectando el alargamiento notablemente. El estroncio, sin
embargo, mostró un efecto de la modificación muy duradero (aproximadamente 3 h). Otro hallazgo interesante es la
existencia de un cierto periodo de incubación de aproximadamente 90 minutos después de agregar Sr. Contrariamente a lo
esperado el uso de titanio no mejoró las propiedades mecánicas a pesar de un eficaz refinamiento de grano.


Palabras claves: Rechupe superior, acción modificadora, propiedades mecánicas, metalurgia no ferrosa.

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Abstract
The influence of Na, Sr and Ti and their combinations (Na-Ti and Sr-Na) on the mechanical properties and the shrinkage
(top macro shrinkage and lateral macro shrinkage) of hypoeutectic aluminium-silicon alloys (AlSi7xMg) has been studied.
Although all these elements and combinations tend to counteract substantially the shrinkage formation, Sr appeared to be
the most effective to decrease top macro shrinkage whereas the combination Na-Ti led to the least formation of lateral
macro shrinkage. An excellent modifying action was observed for 0.02% Sr and 0.02% Na, but unlike Sr the modifying
effect provided by Na started fading after 30 min of holding which affected the elongation markedly. However, strontium
showed a very lasting modification effect (about 3 h). Another interesting finding is the existence of a certain incubation
period of about 90 minutes after adding Sr. Contrary to expected the use of titanium did not lead to any improvement of the
mechanical properties despite an effective grain refinement.


Key words: modifier action, mechanical properties.

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How to Cite

1.
Lavaert V, Moors M, Wettinck E, Castañeda R, Goyos L. Evaluación del efecto de modificadores y refinadores en el comportamiento mecánico y magnitud del rechupe de aleaciones Al-Si-Mg. // Modifier and refiners effect evaluation in the magnitude and mechanical shrinkage behavior of Al-Si-Mg alloys. Ing. Mec. [Internet]. 2002 May 1 [cited 2025 Sep. 13];5(2):37-46. Available from: https://ingenieriamecanica.cujae.edu.cu/index.php/revistaim/article/view/278

Issue

Vol. 5 No. 2 (2002): may-august

Section

Original article

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