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Application of Friction Stir Process to Improve Surface Reliability of Light Weight Magnesium Alloy  

Gil, Ung-Chan (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
Kim, Jae-Yeon (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
Hyun, Chang-Young (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
Publication Information
Journal of Applied Reliability / v.16, no.2, 2016 , pp. 155-161 More about this Journal
Abstract
Purpose: Purpose of this study is to analyze the effect of particle size as well as number of pass on surface microstructure and hardness of SiC(p)/AZ31 surface composite fabricated by friction stir process (FSP). Method: SiC(p)/AZ31 surface composite containing different size of SiC particle (i. e., $2{\mu}m$ and $8{\mu}m$) was fabricated by multi-pass FSP. Microstructure was observed by scanning electron microscope and surface hardness was determined by Vickers hardness tester. Results: For all the FSPed specimens with and without hardening particles, grain size was refined due to dynamic recrystallization behavior. Surface hardness was observed to increase with decreasing particle size in the composite layer. Increasing number of FSP pass was effective for homogeneous distribution of the hardening particles and for resulting increase in surface hardness. Conclusion: FSP was effective to modify surface microstructure for improving surface hardness of SiC/AZ31 composite.
Keywords
Friction Stir Process(FSP); Magnesium Alloy; Surface Reliability; Hardness;
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