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Influence of nano-alumina and sub-micron copper on mechanical properties of magnesium alloy AZ31
Affiliation:1. Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore;2. School of Mechanical and Systems Engineering, Newcastle University International Singapore, 180 Ang Mo Kio Avenue 8, Block P Room 220, Singapore 569830, Singapore;1. State Key Laboratory of Traction Power & School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China;2. Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, Southwest Jiaotong University, Chengdu, Sichuan 610031, China;3. Department of Materials Science and Engineering, University of Central Florida, Orlando, FL 32816, USA;1. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi''an Jiaotong University, No. 28, Xianning West Road, Xi''an, Shaanxi Province 710049, PR China;2. Guangxi Chang Cheng Machineries, Yingbin Avenue, Zijin Mountain County, Hezhou, Guangxi Province, PR China;1. National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai 200240, China;2. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
Abstract:Magnesium composites of AZ31–Al2O3–Cu formulations were produced using the disintegrated melt deposition technique following by hot extrusion. Microstructural characterization showed reasonable distribution of secondary phases up to 1 vol.% of copper. A tendency to form clustered agglomeration and longer shape of secondary phases was observed when the amount of copper was increased to 1.5 vol.%. Mechanical tests indicated remarkable improvements in 0.2%YS, UTS and microhardness when nano-alumina and sub-micron copper were added into AZ31. The ductility was increased up to 9.3% in the case of AZ31–1.5Al2O3–1.0Cu sample and significantly reduced (5.5%) when the amount of copper was increased to 1.5 vol.%. Heat treated sample of AZ31–1.5Al2O3–1.0Cu showed overall improvement in both tensile strength and ductility. The results suggest that the judicious selection of composition and heat treatment has the capability to enhance overall tensile response of Mg–Al2O3–Cu nanocomposites.
Keywords:A  Metal–matrix composites (MMCs)  B  Mechanical properties  D  Fractography  E  Heat treatment
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