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Applications for the strontium treatment of wrought and die-cast Al

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Abstract

Strontium is well known for its ability to modify the eutectic silicon phase in aluminum-silicon foundry alloys. More recently, however, it has been established that strontium also stabilizes the more desirable α iron-bearing intermetallic phase in 6XXX series wrought aluminum alloys. As a result, lengthy billet homogenization times that are normally required to transform the acicular β iron-bearing intermetallic phase to the α phase can be shortened significantly. In the case of the foundry alloys, strontium additions to a 380 alloy were found to increase the pressure tightness of high-pressure die castings by as much as 60%. This improvement is believed to occur as a result of improved metal flow with the strontium addition causing a reduction in the size of the entrapped air pores and the refinement of sludge particles.

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Authors and Affiliations

  1. Timminco Limited, USA

    B. Kulunk Ph.D. (senior research investigator, member of TMS) & D. J. Zuliani Ph.D. (vice president of marketing and research and development, member of TMS)

Authors
  1. B. Kulunk Ph.D.
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  2. D. J. Zuliani Ph.D.
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Kulunk, B., Zuliani, D.J. Applications for the strontium treatment of wrought and die-cast Al. JOM 48, 60–63 (1996). https://doi.org/10.1007/BF03223107

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  • DOI: https://doi.org/10.1007/BF03223107

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