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Journal of Materials Science

, Volume 43, Issue 14, pp 4962–4971 | Cite as

Orientation of silicon particles in a binary Al–Si alloy

  • C. D. MarioaraEmail author
  • S. J. Andersen
  • A. Birkeland
  • R. Holmestad
Article

Abstract

The orientations Si-crystals take in aluminium, in an alloy with composition Al–1.3at%Si, were investigated by transmission electron microscopy. Hardness was measured for isothermal heat-treatments at 175 °C and 260 °C. Conditions analysed by TEM were 17 h at 175 °C and an additional 3 h at 260 °C, both containing a high density of small Si-crystals, the finest corresponding to 175 °C. Two main orientation relationships were found: \((001)\hbox{Al}\,||\,(001)\text{Si}, [100]\hbox{Al}\,||\,[100]\text{Si} \hbox{ and } (001)\hbox{Al}\,||\,(110)\text{Si}, [1\;\overline{1}\;\overline{1}] \text{Si}\,||\,[010]\text{Al}.\) The first accounted for approximately 60% of Si precipitates in condition 17 h_175 °C. Despite a high number density and well-aligned interfaces, the Si precipitates have negligible influence on hardness. Findings are consistent with Ge particles in Al–Ge alloys.

Keywords

Orientation Relation Angular Separation Periodic Match Zone Axis Parallel Diamond Silicon 

Notes

Acknowledgements

This work was financially supported by The Research Council of Norway via two projects: 177600/V30 “Fundamental investigations of solute clustering and nucleation of precipitation” and project 176816/I40 “Nucleation control for optimised properties”, which is also supported by Hydro Al and Steertec Raufoss AS.

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • C. D. Marioara
    • 1
    Email author
  • S. J. Andersen
    • 1
  • A. Birkeland
    • 2
  • R. Holmestad
    • 2
  1. 1.SINTEF Materials and ChemistryTrondheimNorway
  2. 2.Department of PhysicsNorwegian University of Science and TechnologyTrondheimNorway

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