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Dilatometry revealing Si precipitation in Al–Si-alloys

  • Fernando Lasagni , Myriam Dumont , Côme Salamida , Jorge Antonio Acuña und H. Peter Degischer
Veröffentlicht/Copyright: 11. Juni 2013
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 100 Heft 7

Abstract

The precipitation kinetics of Si after different thermal treatments in AlSi-alloys have been studied by means of isothermal calorimetry, differential scanning calorimetry and dilatometry tests. The measured exothermic and endothermic effects produced by the precipitation and dissolution of Si are correlated with the increase and reduction in the coefficient of thermal expansion CTE(T), respectively. The deviation of the CTE(T) of the studied AlSi1.1 – 1.7 alloys with respect to pure Al correspond to the volume fraction of precipitating Si according to thermodynamic solubility limits. Two different kinetics in the growth of Si precipitates are distinguished: while Si precipitates in the range of 200 – 300 °C during heating of solution quenched samples supersaturated with vacancies, retardation into the temperature range of 300 – 420 °C is observed in samples slowly cooled after solution treatment. The presence of the eutectic Si increases the quench sensitivity of the precipitation kinetics of Si as observed in CTE(T) curves. The ripening of the eutectic Si during prolonged solution treatment retards the Si precipitation slightly.

Keywords: Si precipitation; Thermal expansion; Differential scanning calorimetry (DSC); Dilatometry
* Correspondence address, Prof. Dr. H. Peter Degischer, TU-Wien, Karlsplatz 13/E308, A-1040 Vienna, Austria, Tel.: +43 1 58801 30811, Fax: +43 1 58801 30899, E-mail:

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Received: 2008-1-31
Accepted: 2009-4-15
Published Online: 2013-06-11
Published in Print: 2009-07-01

© 2009, Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Feature
  4. Intermolecular slip mechanism in tropocollagen nanofibrils
  5. Basic
  6. Identification of model parameters from elastic/elasto-plastic spherical indentation
  7. Penetration of a pyramid indenter into a multilayer coating
  8. Nanoindentation of pseudoelastic NiTi shape memory alloys: Thermomechanical and microstructural aspects
  9. Analysis of nanoindentation curves in the case of bulk amorphous polymers
  10. Effect of indenter shapes on inverse materials characterization based on the dual indenters method
  11. Applied
  12. Creep properties from indentation tests by analytical and numerical techniques
  13. Analysis of nanoindentation and nanoscratch experiments of thin amorphous carbon coatings and multilayers: friction, wear and elastic – plastic deformation
  14. Mutual consistency of hardness testing at micro- and nanometer scales
  15. Friction and adhesion of carbon nanotube brushes
  16. Mechanical testing of single yeast cells in liquid environment: Effect of the extracellular osmotic conditions on the failure behavior
  17. UFG and nanocrystalline microstructures produced by hydrostatic extrusion of multifilament wires
  18. In-situ high temperature microstructural analysis during tempering of 42CrMo4 using transmission electron microscopy
  19. Mixing enthalpies in Ag–Ca, Ag–Eu and Ag–Yb liquid alloys
  20. Dilatometry revealing Si precipitation in Al–Si-alloys
  21. Notifications
  22. DGM News
https://doi.org/10.3139/146.110145
Schlagwörter für diesen Artikel
Si precipitation; Thermal expansion; Differential scanning calorimetry (DSC); Dilatometry

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Feature
  4. Intermolecular slip mechanism in tropocollagen nanofibrils
  5. Basic
  6. Identification of model parameters from elastic/elasto-plastic spherical indentation
  7. Penetration of a pyramid indenter into a multilayer coating
  8. Nanoindentation of pseudoelastic NiTi shape memory alloys: Thermomechanical and microstructural aspects
  9. Analysis of nanoindentation curves in the case of bulk amorphous polymers
  10. Effect of indenter shapes on inverse materials characterization based on the dual indenters method
  11. Applied
  12. Creep properties from indentation tests by analytical and numerical techniques
  13. Analysis of nanoindentation and nanoscratch experiments of thin amorphous carbon coatings and multilayers: friction, wear and elastic – plastic deformation
  14. Mutual consistency of hardness testing at micro- and nanometer scales
  15. Friction and adhesion of carbon nanotube brushes
  16. Mechanical testing of single yeast cells in liquid environment: Effect of the extracellular osmotic conditions on the failure behavior
  17. UFG and nanocrystalline microstructures produced by hydrostatic extrusion of multifilament wires
  18. In-situ high temperature microstructural analysis during tempering of 42CrMo4 using transmission electron microscopy
  19. Mixing enthalpies in Ag–Ca, Ag–Eu and Ag–Yb liquid alloys
  20. Dilatometry revealing Si precipitation in Al–Si-alloys
  21. Notifications
  22. DGM News
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