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Metallurgical and Materials Transactions A

, Volume 28, Issue 6, pp 1289–1295 | Cite as

The effect of strontium on the Mg2Si precipitation process in 6201 aluminum alloy

  • M. H. Mulazimoglu
  • A. Zaluska
  • F. Paray
  • J. E. Gruzleski
Article

Abstract

A transmission electron microscopy (TEM) study of a 6201 aluminum alloy to which controlled strontium additions were made has revealed important differences compared to the same alloy free of strontium. In the as-cast state, strontium favors the formation of α-AlFeSi (Al8Fe2Si) rather than β-AlFeSi (Al5FeSi) phase, resulting in a greater quantity of excess silicon present in the strontium-treated alloy. During heat treatment, the excess silicon allows a greater density of finer β″-Mg2Si precipitates to form, leading to increased tensile strength values and increased electrical resistivity. Strontium also retards the growth of the precipitates formed during heat treatment and inhibits formation of the equilibrium β-Mg2Si phase. As a result, the strontium-treated alloy exhibits a resistance to overaging.

Keywords

Material Transaction Electrical Resistivity Ultimate Tensile Strength Subgrain Structure Coherency Strain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 1997

Authors and Affiliations

  • M. H. Mulazimoglu
    • 1
  • A. Zaluska
    • 2
  • F. Paray
    • 3
  • J. E. Gruzleski
    • 3
  1. 1.the Aluminum DivisionAmerican Racing Equipment Inc.Rancho Dominguez
  2. 2.Department of PhysicsMcGill UniversityMontrealCanada
  3. 3.Department of Mining and Metallurgical EngineeringMcGill UniversityMontrealCanada

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