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Journal of Materials Science

, Volume 45, Issue 3, pp 641–651 | Cite as

Precipitation-hardening in cast AL–Si–Cu–Mg alloys

  • F. J. Tavitas-Medrano
  • A. M. A. Mohamed
  • J. E. Gruzleski
  • F. H. SamuelEmail author
  • H. W. Doty
Article

Abstract

Age-hardenable aluminum–silicon alloys have attracted increasing attention in recent years, particularly as a result of the demand for lighter vehicles as part of the overall goal to improve fuel efficiency and to reduce vehicle emissions. Among these aluminum cast alloys, the 319-type alloys have become the object of extensive investigation considering their practical importance to the transport industry. All the experimental variables, such as solidification condition, composition, and heat treatment, are known to have an influence on precipitation behavior; precipitation-hardening, however, is the most significant of these because of the presence of excess alloying elements from the supersaturated solid solution which form fine particles and consequently act as obstacles to dislocation movement. The precipitation-hardening behavior of a Sr-modified 319-type alloy containing 0.4% Mg was investigated for this study using transmission electron microscopy. Non-conventional aging cycles were applied so as to evaluate the degree of the improvement in strength potentially obtainable. The results show that the main strengthening phase is θ-Al2Cu occurring in the form of plates; other phases were observed as minor constituents in this alloy, including the binary β-Mg2Si, the ternary S-CuAlMg2, and the quaternary Q-Al5Cu2Mg7Si7.

Keywords

Zone Axis Solution Heat Treatment TiAl3 Supersaturated Solid Solution Show Transmission Electron Microscope Image 

Notes

Acknowledgements

The authors would like to express their gratitude to the Natural Sciences and Engineering Research Council of Canada (NSERC), to General Motors Powertrain Group (USA), and to Corporativo Nemak (Mexico) for the financial support and in-kind help provided for carrying out this research. Help provided by Dr. Agnes M. Samuel in correcting the manuscript is greatly appreciated.

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • F. J. Tavitas-Medrano
    • 1
  • A. M. A. Mohamed
    • 2
    • 3
  • J. E. Gruzleski
    • 1
  • F. H. Samuel
    • 2
    Email author
  • H. W. Doty
    • 4
  1. 1.Department of Mining, Metals and Materials EngineeringMcGill UniversityMontrealCanada
  2. 2.Département des Sciences AppliquéesUniversité du Québec à ChicoutimiChicoutimiCanada
  3. 3.Department of Metallurgical and Materials Engineering, Faculty of Petroleum and Mining EngineeringSuez Canal UniversitySuezEgypt
  4. 4.GM Powertrain Group, Metal Casting Technology, Inc.MilfordUSA

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