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The simultaneous efect of extrusion and T6 treatment on the mechanical properties of Al-15wt.%Mg2Si composite

  • N. Soltani , A. Bahrami , F. M. Moghimi , M. I. Pech-Canul and A. Hajaghasi
Published/Copyright: May 2, 2013
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HTM Journal of Heat Treatment and Materials
From the journal HTM Journal of Heat Treatment and Materials Volume 67 Issue 6

Abstract

This article investigates the simultaneous efect of extrusion ratio and T6 heat treatment on microstructure and mechanical properties of in-situ Al-15wt.%Mg2Si composite. his composite has already been introduced as a new class of light materials but the brittle structure of the primary Mg2Si which is formed during solidiication limits its application. As-cast composite was directly extruded as rod by using three diferent dies. Ater T6 heat treatment on extruded samples, microstructure was studied by optical and scanning electron microscopy. Results demonstrated that extruded and heat treated composite possesses considerably higher strength and enhanced ductility in comparison with the as-cast samples. It was also found that heat treatment and extrusion processes change the primary Mg2Si morphology considerably and its size increases as extrusion ratio decreased. Fracture surface examinations revealed a transition from brittle fracture mode in as-cast composite to ductile fracture in heat treated and extruded specimens. his can be attributed to the changes in size and morphology of Mg2Si intermetallics and porosity content.

Kurzfassung

Die vorliegende Arbeit untersucht den kombinierten Einluss verschiedener Umformgrade beim Strangpressen und einer T6-Wärmebehandlung auf Gefüge und mechanische Eigenschaten eines Al-15 Ma.-%Mg2Si-Verbundwerkstofs. Dieser gehört zu einer bereits bekannten Klasse neuer Leichtbauwerkstofe, deren Einsatzbereich jedoch durch die Sprödigkeit der primären Mg2Si-Partikel, die sich während der Erstarrung bilden, eingeschränkt ist. Das gegossene Ausgangsmaterial wurde mithilfe von drei verschiedenen Stempeln direkt in Stangenform gepresst. Nach der T6-Wärmebehandlung an extrudierten Proben wurde die Mikrostruktur durch Lichtund Rasterelektronenmikroskopie untersucht. Die Ergebnisse zeigten, dass extrudierte und wärmebehandelte Proben wesentlich höhere Festigkeit und erhöhte Duktilität im Vergleich zu den Proben im gegossenen Zustand besitzen. Ferner wurde beobachtet, dass Prozesse, die Strangpressen und Wärmebehandlung kombinieren, die Morphologie der primären Mg2Si-Ausscheidungen signiikant verändern, wobei ihre Gräße mit abnehmendem Umformgrad ansteigt. Eine Untersuchung der Bruchflächen zeigte einen Übergang des Bruchmodus von Sprödbruch beim Ausgangsmaterial zu duktilem Bruch in den extrudierten und wärmebehandelten Proben. Dies kann den Änderungen der Größe und Morphologie der Mg2Si-Phasen und der Porosität zugeschrieben werden.

Keywords: Aluminum matrix composite; hot extrusion; T6 heat treatment; mechanical properties
Schlüsselwörter: Aluminiummatrix-Verbundwerkstoff; Warmstrangpressen; T6-Wärmebehandlung; mechanische Eigenschaten
∗ (Corresponding author/Kontakt)

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Published Online: 2013-05-02
Published in Print: 2012-12-01

© 2012, Carl Hanser Verlag, München

Articles in the same Issue

  1. Veranstaltungen/Events
  2. Veranstaltungen in Zusammenarbeit mit der AWT
  3. HTM-Praxis
  4. HTM Praxis
  5. Kurzfassungen/Summaries
  6. Kurzfassungen/Abstracts
  7. Inhalt/Contents
  8. Inhalt
  9. Fachbeiträge/Technical Contributions
  10. Analysis of surface layer characteristics for sequential cutting operations
  11. Einfluss der Wärmebehandlung und des Werkstoffs auf den Verzug von querfließgepressten Tripoden
  12. Experimentelle und numerische Untersuchung zum induktiven Vorschubhärten von Profil führungsschienen
  13. The simultaneous efect of extrusion and T6 treatment on the mechanical properties of Al-15wt.%Mg2Si composite
  14. Kurzzeit-Rekristallisationsglühen von Mikrobauteilen aus X5CrNi18-10 im Fallrohrofen∗∗
  15. Vergleichende Untersuchungen zur Bestimmung des Austenitgehalts austenitisch-ferritischen Gusseisens mit Kugelgraphit (ADI)
https://doi.org/10.3139/105.110158
Keywords for this article
Aluminum matrix composite; hot extrusion; T6 heat treatment; mechanical properties

Articles in the same Issue

  1. Veranstaltungen/Events
  2. Veranstaltungen in Zusammenarbeit mit der AWT
  3. HTM-Praxis
  4. HTM Praxis
  5. Kurzfassungen/Summaries
  6. Kurzfassungen/Abstracts
  7. Inhalt/Contents
  8. Inhalt
  9. Fachbeiträge/Technical Contributions
  10. Analysis of surface layer characteristics for sequential cutting operations
  11. Einfluss der Wärmebehandlung und des Werkstoffs auf den Verzug von querfließgepressten Tripoden
  12. Experimentelle und numerische Untersuchung zum induktiven Vorschubhärten von Profil führungsschienen
  13. The simultaneous efect of extrusion and T6 treatment on the mechanical properties of Al-15wt.%Mg2Si composite
  14. Kurzzeit-Rekristallisationsglühen von Mikrobauteilen aus X5CrNi18-10 im Fallrohrofen∗∗
  15. Vergleichende Untersuchungen zur Bestimmung des Austenitgehalts austenitisch-ferritischen Gusseisens mit Kugelgraphit (ADI)
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