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

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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 (T–fs 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.

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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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Authors and Affiliations

  1. School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Narmak, Tehran, 16846-13114, Iran

    Mohammad Pourgharibshahi, Hassan Saghafian & Mehdi Divandari

  2. Department of Management and Engineering, University of Padova, Stradella S. Nicola, 3, 36100, Vicenza, Italy

    Giulio Timelli

Authors
  1. Mohammad Pourgharibshahi
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  2. Hassan Saghafian
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  3. Mehdi Divandari
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  4. Giulio Timelli
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Corresponding author

Correspondence to Hassan Saghafian.

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Manuscript submitted July 18, 2018.

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Pourgharibshahi, M., Saghafian, H., Divandari, M. et al. Controlled Diffusion Solidification Pathway of an AA 7xxx Series Aluminum Alloy. Metall Mater Trans A 50, 326–335 (2019). https://doi.org/10.1007/s11661-018-5000-x

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  • DOI: https://doi.org/10.1007/s11661-018-5000-x

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