Shape Casting pp 321-328 | Cite as

The Effect of Friction Stir Processing on Bifilms and Structural Quality in A356 Alloy Castings

  • Nelson Netto
  • Murat TiryakioğluEmail author
  • Paul D. Eason
  • Boğaçhan Őndeş
  • Eray Erzi
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


The effect of friction stir processing (FSP) on the structural quality was tested in two A356 alloy ingots: conventional and continuously cast. Reduced pressure tests and microstructural analysis showed that the initial quality and microstructure in the two ingots were significantly different. The structural quality, as measured by the quality index QT, of the conventional ingot improved with each FSP pass, whereas that of the continuously cast ingot went up after the first pass and remained essentially constant with additional passes. The contribution of microstructural refinement as a result of FSP on the improvement of structural quality remains unknown. However, the largest contribution comes from bifilms breaking up during the friction stir process.


Bifilms Microstructural refinement Quality index 


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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Nelson Netto
    • 1
  • Murat Tiryakioğlu
    • 3
    Email author
  • Paul D. Eason
    • 1
  • Boğaçhan Őndeş
    • 1
  • Eray Erzi
    • 2
  1. 1.School of EngineeringUniversity of North FloridaJacksonvilleUSA
  2. 2.Metallurgical and Materials Engineering DepartmentIstanbul University-CerrahpaşaIstanbulTurkey
  3. 3.University of North FloridaJacksonvilleUSA

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