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Journal of Materials Science

, Volume 43, Issue 22, pp 7157–7164 | Cite as

Effect of Ce and La on microstructure and properties of a 6xxx series type aluminum alloy

  • Mehdi HosseinifarEmail author
  • Dmitri V. Malakhov
Article

Abstract

The increase in iron content in secondary sources of aluminum has led to an increase in the amount of Fe-bearing intermetallic phases in Al alloys. One of these intermetallics, β-AlFeSi, which is seen as the dominant phase in 6xxx series alloys, reduces bendability of wrought alloys, which in turn, limits their usage in the automotive industry. It is known that small additions of Sr prevent the formation of the β phase and facilitate the precipitation of a less detrimental intermetallic, α-AlFeSi, in as-cast alloys. It is worth investigating whether other elements cause a similar effect. Cerium and lanthanum as the least expensive representatives of rare-earth metals are tried as such elements. It is found that in alloys containing 0.1–0.2 wt.% of lanthanum, the fraction of β particles is pronouncedly less than that in the reference alloy. In addition to this advantage, much smaller grains are seen in the alloy with 0.2 wt.% La. Despite similarities between La and Ce, the latter metal neither modifies the microstructure nor noticeably affects the grain size. Moderate thermo-mechanical processing nullifies the beneficial effect of small La additions resulting in no improvement in the bendability of the alloy.

Keywords

Intermetallic Particle Mischmetal AlFeSi Glow Discharge Optical Emission Spectroscopy Chinese Script 

Notes

Acknowledgements

The authors gratefully acknowledge the financial support of the Auto 21 research initiative. The in kind support of Novelis Inc. is also greatly appreciated.

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Department of Materials Science and EngineeringMcMaster UniversityHamiltonCanada

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