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Microstructure Evolution of Ultra-Fine-Grained AZ31 B Magnesium Alloy Produced by Submerged Friction Stir Processing

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Abstract

Ten-millimeter-thick strain-hardened AZ31B-H24 magnesium sheets were subjected to friction stir processing (FSP) in air and submerged friction stir processing (SFSP) under water to investigate their microstructures and microhardness properties. Different rotational speeds of 500, 630, 800, and 1000 rpm and traverse speeds of 50, 100, 200, and 350 mm/min were employed for processing the materials. For SFSPed samples, the rotational speed of 500 rpm and 200 mm/min of traverse speed resulted in an ultra-fine-grained structure with a minimum grain size of about 400-500 nm, which is half compared to that of FSPed. It was found that both processes led to variation of crystallographic orientation, and enhancing the rotational speed and lowering the traverse speed promoted the development of a {0002} basal texture. The microhardness of SFSPed material increased significantly up to 110% (~ 95 Hv), while the microhardness was 45% (~ 65 Hv) higher than the base metal (~ 45 Hv) for FSPed material.

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Authors and Affiliations

  1. Department of Materials Engineering, Isfahan University of Technology, Esfahan, 84156-83111, Iran

    Ali Shahnam, Fathallah Karimzadeh & Mohammad Ali Golozar

  2. Department of Mechanical Engineering, Persian Gulf University, Bushehr, 75169-13798, Iran

    Seyedeh Narjes Hosseini

Authors
  1. Ali Shahnam
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  2. Fathallah Karimzadeh
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  4. Seyedeh Narjes Hosseini
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Correspondence to Fathallah Karimzadeh or Seyedeh Narjes Hosseini.

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Shahnam, A., Karimzadeh, F., Golozar, M.A. et al. Microstructure Evolution of Ultra-Fine-Grained AZ31 B Magnesium Alloy Produced by Submerged Friction Stir Processing. J. of Materi Eng and Perform 28, 4593–4601 (2019). https://doi.org/10.1007/s11665-019-04198-6

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  • DOI: https://doi.org/10.1007/s11665-019-04198-6

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