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Coarsening of equiaxed microstructure in the semisolid state of aluminum 7075 alloy through SIMA processing

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Abstract

In the present study, the coarsening mechanism of equiaxed grains in the semisolid state of aluminum 7075 alloy, treated via strain induced melting activation process, was investigated. The kinetics of equiaxed grain growth in the semisolid state of the experimental alloy was determined. The results revealed that when the holding temperature increased, the coarsening rate constant (K) showed a precipitously increasing character in the range of 590–610 °C. This was attributed to the extensive effect of the coalescence mechanism on the grain growth at the high solid fractions. By further increasing the holding temperature to 620 and 625 °C (increasing the liquid fraction), the effect of coalescence on the grain growth appeared to be weakened, that is, although there was a slight decrease at 620 °C, a gently increasing character could be generally supposed. Severe segregation of Zn and Cu alloying elements at grain boundaries and intragranular droplets was detected at 620 and 625 °C after 15 and 10 min, respectively.

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Acknowledgements

This study was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2009-008/099) and (No. 2011-0030665) of MEST.

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Authors and Affiliations

  1. Graduate School of Mechanical and Precision Engineering, Pusan National University, Busan, 609-735, Republic of Korea

    Amir Bolouri

  2. Department of Materials and Metallurgical Engineering, Iran University of Science and Technology, 16846-13114, Narmak, Tehran, Iran

    Mohammad Shahmiri

  3. School of Mechanical Engineering, Pusan National University, Busan, 609-735, Republic of Korea

    Chung Gil Kang

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  1. Amir Bolouri
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  2. Mohammad Shahmiri
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  3. Chung Gil Kang
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Correspondence to Chung Gil Kang.

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Bolouri, A., Shahmiri, M. & Kang, C.G. Coarsening of equiaxed microstructure in the semisolid state of aluminum 7075 alloy through SIMA processing. J Mater Sci 47, 3544–3553 (2012). https://doi.org/10.1007/s10853-011-6200-6

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  • DOI: https://doi.org/10.1007/s10853-011-6200-6

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