Is 'Sr ' grain refiner for cast Al-alloys?

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• 
  Iman El Mahallawi · The British University in Egypt

  at one stage Na as well as Sr were added to AlSi alloys for refining purposes and evidence was shown in many cases of refinement of AlSi eytectic interlamellar particles and spacings. However, refining was not homogenuous in many cases and fading effects were reported. Recently, I have found evidence of refinement of microstructure in Al Si alloys by dispersing nano-particles.

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  at one stage Na as well as Sr were added to AlSi alloys for refining purposes and evidence was shown in many cases of refinement of AlSi eytectic interlamellar particles and spacings. However, refining was not homogenuous in many cases and fading effects were reported. Recently, I have found evidence of refinement of microstructure in Al Si alloys by dispersing nano-particles.

  Jan 10, 2012
• 
  Gopal Anugula · Aditya Birla Group

  Thanks a lot for your valuable explanation

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  Thanks a lot for your valuable explanation

  Jan 11, 2012
• 
  V. C. Srivastava · National Metallurgical Laboratory

  Sr is basically a eutectic modifier which modifies the platelike eutectic. Generally, refinement can be achieved by using AlP which acts as hetergeneous nucleation sites for the primary Si. The refinement achieved by using nanoparticles comes from a different mechanism and depends upon the wettability of the particles with Al liquid.

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  Sr is basically a eutectic modifier which modifies the platelike eutectic. Generally, refinement can be achieved by using AlP which acts as hetergeneous nucleation sites for the primary Si. The refinement achieved by using nanoparticles comes from a different mechanism and depends upon the wettability of the particles with Al liquid.

  Feb 29, 2012
• 
  Nils Ellendt · Universität Bremen

  To my knowledge TiB2 might work. Are you thinking about some specific alloys or alloy systems?

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  To my knowledge TiB2 might work. Are you thinking about some specific alloys or alloy systems?

  Feb 29, 2012