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Microstructure Evolution and Improved Creep Behavior of Mg-Al-Si Alloy Matrix Composite Reinforced with SiC Nanoparticles

  • Ming Li
  • Gaozhan Zhao
  • Zhiwei Huang
  • Jianquan Tao
  • Yuanyuan Wan
  • Zhihui Xing
  • Hongxia WangEmail author
  • Qiang Chen
Article

Abstract

The Mg-9Al-1Si matrix composite reinforced with SiC nanoparticles is fabricated by semisolid stirring-assisted ultrasonic vibration, which contains finer grains and a more uniform microstructure compared to that of the Mg-9Al-1Si alloys. The sizes of the Mg17Al12 and Mg2Si phases decreased continuously as the volume fraction of n-SiCp increased from 0 to 1% and then increased apparently when the volume fraction of n-SiCp increased to 1.5%. The steady-creep rates of the 1 vol.% n-SiCp/Mg-9Al-1Si are approximately two times lower than those of the Mg-9Al-1Si matrix alloy at 200 °C under applied stress of 70 MPa due to the strengthening effect of the nanosized SiCp. The reason for the improved creep properties is mainly attributed to the obvious grain boundary strengthening, the Orowan strengthening mechanism, the load transfer effect, and the pinning effect of the n-SiCp and the refined Mg17Al12 and Mg2Si phases.

Keywords

creep resistance magnesium matrix composite microstructure SiC nanoparticles strengthening mechanism 

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (Nos. 51301118, 51375464 and 51404166), the National Natural Science Foundation of Shanxi Province (No. 201701D121045), Shanxi Province Scientific Facilities and Instruments Shared Service Platform (No. 201805D141005) and the Shanxi Key Laboratory of Advanced Magnesium-Based Material, Taiyuan University of Technology (AMM-2017-12).

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Copyright information

© ASM International 2019

Authors and Affiliations

  • Ming Li
    • 1
    • 2
  • Gaozhan Zhao
    • 1
  • Zhiwei Huang
    • 1
  • Jianquan Tao
    • 1
  • Yuanyuan Wan
    • 1
  • Zhihui Xing
    • 1
  • Hongxia Wang
    • 2
    Email author
  • Qiang Chen
    • 1
  1. 1.Southwest Technology and Engineering Research InstituteChongqingPeople’s Republic of China
  2. 2.Shanxi Key Laboratory of Advanced Magnesium-Based Materials, School of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuanPeople’s Republic of China

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