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Metallurgical and Materials Transactions A

, Volume 50, Issue 1, pp 326–335 | Cite as

Controlled Diffusion Solidification Pathway of an AA 7xxx Series Aluminum Alloy

  • Mohammad Pourgharibshahi
  • Hassan SaghafianEmail author
  • Mehdi Divandari
  • Giulio Timelli
Article
  • 86 Downloads

Abstract

The solidification path of a controlled diffusion solidification (CDS) mixture based on the determination of a common cooling curve cannot be easily studied. This is due to the interference caused by convectional flows through temperature distribution and loss of the liquidus temperature. In this work, the lost stage of the CDS pathway for an AA 7xxx series aluminum alloy has been defined both experimentally and by the use of a Scheil solidification curve for high thermal-mass alloy. The solidification path (Tfs curve) of the alloy shifts to higher temperatures as a result of CDS processing which indicates an alternative form of higher-kinetics nucleation and growth. As a result of the increase in the nucleation temperature, the solidification interval can be larger than that of the conventional alloy. In comparison with the conventional solidification, CDS promotes the coherency fraction solid, while it has no effect on the coherency temperature.

Notes

Acknowledgment

The authors would like to thank Dr. Alberto Fabrizi from the Department of Management and Engineering at the University of Padova for assistance with the FEG-SEM studies.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  • Mohammad Pourgharibshahi
    • 1
  • Hassan Saghafian
    • 1
    Email author
  • Mehdi Divandari
    • 1
  • Giulio Timelli
    • 2
  1. 1.School of Metallurgy and Materials EngineeringIran University of Science and TechnologyTehranIran
  2. 2.Department of Management and EngineeringUniversity of PadovaVicenzaItaly

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