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Microstructural evolution and its effect on Hall-Petch relationship in friction stir welding of thixomolded Mg alloy AZ91D

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Abstract

Microstructural evolution of a thixomolded magnesium (Mg) alloy AZ91D during friction stir welding was investigated. Friction stir welding resulted in a homogeneous microstructure consisting of fine recrystallised α-Mg grains in the thixomolded material. The microstructural homogenisation and refinement was attributed to dynamic recrystallisation accompanied by the dissolution of the eutectic structure during the welding. The grain refinement in the stir zone was effective in increasing the hardness, as predicted by the Hall-Petch equation. The effect of grain size on hardness was smaller than that in conventional and rapidly solidified AZ91. This phenomenon may be explained as being due to the microstructure of the stir zone which consisted of fine equiaxed grains with a high density of dislocations.

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Authors and Affiliations

  1. Department of Materials Processing, Graduate School of Engineering, Tohoku University, Aoba-yama 02, Sendai, 980-8579, Japan

    Seung Hwan C. Park, Yutaka S. Sato & Hiroyuki Kokawa

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  1. Seung Hwan C. Park
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  2. Yutaka S. Sato
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  3. Hiroyuki Kokawa
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Park, S.H.C., Sato, Y.S. & Kokawa, H. Microstructural evolution and its effect on Hall-Petch relationship in friction stir welding of thixomolded Mg alloy AZ91D. Journal of Materials Science 38, 4379–4383 (2003). https://doi.org/10.1023/A:1026351619636

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