Effects of volume ratio on the microstructure and mechanical properties of particle reinforced magnesium matrix composite |
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| Affiliation: | 1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China;2. Key Laboratory of Interface Science and Engineering in Advanced materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, PR China;1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;1. School of Materials Science and Engineering, Harbin Institute of Technology (HIT), Harbin, China;2. School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, China;3. Harbin Turbine Company Limited, Harbin, China;4. College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, China;1. Department of Printed Electronics Engineering, Sunchon National University, Suncheon, South Korea;2. School of Engineering and Material Science, Queen Mary University of London, London E1 4NS, UK |
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| Abstract: | In the present study, the AZ91 alloy reinforced by (submicron + micron) SiCp with four kind volume ratio was fabricated by the semisolid stirring casting technology. The influence of volume ratio between submicron and micron SiCp on the microstructure and mechanical properties of Mg matrix was investigated. Results show that the submicron SiCp is more conducive to grain refinement as compared with micron SiCp. With the increase of volume ratio, the submicron particle dense regions increase and the average grain size decreases. The yield strength of bimodal size SiCp/AZ91 composite is higher than monolithic micron SiCp/AZ91composite. Both ΔσHall–Petch and ΔσCTE increase as the volume ratio changes from 0:10, 0.5:9.5, 1:9 to 1.5:8.5. Among the composite with different volume ratio, the S-1.5 + 10-8.5 composite has the best mechanical properties. The interface debonding is found at the interface of micron SiCp-Mg. As the increase of volume ratio, the phenomenon of interface debonding weakens and the amount of dimples increases. |
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| Keywords: | Magnesium matrix composite SiCp Microstructure Mechanical properties Fracture |
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