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Dissolution Kinetics of Spheroidal-Shaped Precipitates in Age-Hardenable Aluminum Alloys

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Abstract

As a first attempt, a mathematical model is proposed to predict the dissolution kinetics of non-spherical secondary phase precipitates during solution heat treatment of age-hardenable aluminum alloys. The model uses general spheroidal geometry to describe the dissolution process of the alloys containing needle/disc-shaped particles with different size distributions in a finite matrix. It is found that as the aspect ratio deviates from unity, the dissolution rate is accelerated. Also, the dissolution rate of the particles in the alloy containing the particle size distribution is lower than that of mono-sized particles system. The modeling results for dissolution of θ′ precipitates in an Al-Cu alloy are compared with experiments, and a good agreement was found between the modeling and the experimental results. The proposed model can be applied to different isothermal and non-isothermal annealing conditions.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, Iran

    Nozar Anjabin

  2. Department of Materials Science and Engineering, K. N. Toosi University of Technology, Tehran, Iran

    Majid Seyed Salehi

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  1. Nozar Anjabin
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  2. Majid Seyed Salehi
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Correspondence to Nozar Anjabin.

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Manuscript submitted January 15, 2018.

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Anjabin, N., Salehi, M.S. Dissolution Kinetics of Spheroidal-Shaped Precipitates in Age-Hardenable Aluminum Alloys. Metall Mater Trans A 49, 3584–3591 (2018). https://doi.org/10.1007/s11661-018-4674-4

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