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Effect of hot extrusion on the microstructure and mechanical properties of the SiCp/Mg-9Al-1Zn nanocomposite fabricated by different stir time
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Shanxi Key Laboratory of Advanced Magnesium based Materials,School of Materials Science and Engineering,Taiyuan University of Technology,Shanxi Key Laboratory of Advanced Magnesium based Materials,School of Materials Science and Engineering,Taiyuan University of Technology,Shanxi Key Laboratory of Advanced Magnesium based Materials,School of Materials Science and Engineering,Taiyuan University of Technology,Shanxi Key Laboratory of Advanced Magnesium based Materials,School of Materials Science and Engineering,Taiyuan University of Technology,Shanxi Key Laboratory of Advanced Magnesium based Materials,School of Materials Science and Engineering,Taiyuan University of Technology

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National Natural Science Foundation of China; International Cooperation in Shanxi; Technological Innovation Programs of Higher Education Institutions in Shanxi

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    Abstract:

    1wt% SiC nanoparticles reinforced Mg-9Al-1Zn magnesium matrix composite was fabricated by stir casting and hot extrusion. Effect of stirring for 10min and 30min respectively on microstructure and mechanical properties of SiCp/Mg-9Al-1Zn nanocomposite was researched. The results show that the grains of the matrix in the as-cast SiCp/Mg-9Al-1Zn nanocomposite stirring for 30min are mainly refined. But the mechanical properties of nanocomposite decline due to the increase of agglomerated SiC nanoparticles and Mg17Al12 phases with network morphology along the grain boundaries. After hot extrusion, a bimodal microstructure composed of alternate arrays of fine DRXed grains and relatively coarse DRXed grains is formed. Particularly, for as-extrusion nanocomposites stirring for 30min, the fine DRXed region can be increased and the distribution of SiC nanoparticles is more homogenous, which can exhibit superior mechanical properties compared with as-extruded SiCp/Mg-9Al-1Zn nanocomposite stirring for 10min.

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[Wang Wanhua, Wang Hongxia, Ren Guangxiao, Cheng Weili, Zhang Shaoxiong. Effect of hot extrusion on the microstructure and mechanical properties of the SiCp/Mg-9Al-1Zn nanocomposite fabricated by different stir time[J]. Rare Metal Materials and Engineering,2017,46(10):2847~2851.]
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History
  • Received:July 22,2016
  • Revised:January 08,2017
  • Adopted:February 21,2017
  • Online: December 01,2017
  • Published: