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Microstructure Modification of Powder Compact of Al–Zn–Mg Nanostructured Alloy by a Semisolid Thermomechanical Processing

Acta Metallurgica Sinica (English Letters) volume 29, pages 39–45 (2016)Cite this article

Abstract

A thermomechanical process (TMP) consisting of three cycles of cold pressing at 154 MPa and liquid-phase sintering at 600 °C for 30 min in each cycle was applied to modify the microstructure of nanostructured Al–Zn–Mg alloy. The alloy powders were produced by mechanical alloying. Also, solid-state sintering at 550 °C for 90 min was done to compare the results with those obtained from the TMP. The powders and the thermomechanically (TM) processed samples were analyzed by XRD to reveal the present phases in addition to calculating the crystallite size changes by the Williamson–Hall method. Moreover, scanning electron microscope was employed to observe the morphology of the powder and the microstructures of the sintered and the TM processed samples. The results revealed that the TMP affected the microstructure noticeably as well as the microhardness by removing the continuous grain boundary porosities and uniform distribution of the intermetallic phase particles as well as obtaining a near globular microstructure after the second cycle. Also, the average grain sizes in the first and the second cycles of the TMP were lower than those of the sintered sample. Furthermore, nanocrystalline grains were stable up to the second cycle of the TMP.

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Acknowledgments

The authors would like to thank the authorities of Institute of Science, High Technology and Environmental Sciences, Graduate University of Advanced Technology and also INSF (the No. 92006471) due to their attempts for financial support of this work.

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Authors and Affiliations

  1. Department of Metals, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, PO BOX 76315-115, Kerman, Iran

    Mohsen Hajizamani & Mostafa Alizadeh

  2. Department of Materials Science and Engineering, School of Engineering, Shiraz University, PO BOX 71348-51154, Shiraz, Iran

    Seyed Ahmad Jenabali-Jahromi

Authors
  1. Mohsen Hajizamani
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  2. Mostafa Alizadeh
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  3. Seyed Ahmad Jenabali-Jahromi
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Correspondence to Mohsen Hajizamani or Mostafa Alizadeh.

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Hajizamani, M., Alizadeh, M. & Jenabali-Jahromi, S.A. Microstructure Modification of Powder Compact of Al–Zn–Mg Nanostructured Alloy by a Semisolid Thermomechanical Processing. Acta Metall. Sin. (Engl. Lett.) 29, 39–45 (2016). https://doi.org/10.1007/s40195-015-0360-3

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  • DOI: https://doi.org/10.1007/s40195-015-0360-3

Keywords

  • Thermomechanical processing
  • Al–Zn–Mg alloy
  • Intermetallics
  • Sintering
  • Grain growth