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Journal of Materials Engineering and Performance

, Volume 26, Issue 4, pp 1847–1855 | Cite as

Microstructure and Tensile Properties of n-SiCp/Mg-9%Al Composites Prepared by Ultrasonic Assisted Hot Pressing of Powder

  • Ming Li
  • Hongxia Wang
  • Kaibo Nie
  • Yiming Liu
  • Wei Liang
Article

Abstract

In this paper, the Mg-9%Al alloy reinforced by 5 wt.% SiC nanoparticles was fabricated by hot pressing of powder with ultrasonic vibration under a semi-solid state. The influence of hot-pressing temperature on the microstructure and mechanical properties of the n-SiCp/Mg-9%Al composite was investigated. The results indicated that the density of the composite was increased significantly and the agglomeration of SiC nanoparticles was evidently reduced with the increase in the hot-pressing temperature from 450 to 510 °C. Additionally, the elevated hot-pressing temperature resulted in remarkable grain refinement. However, as the hot-pressing temperature increased to 530 °C, the density decreased and the average grain size increased, which caused a decline in the mechanical properties. The study of the interface between the n-SiCp and the matrix in the nanocomposite suggested that n-SiCp bonded well with the matrix without interfacial activity. The ultimate tensile strength, yield strength and elongation to fracture of the nanocomposites were simultaneously enhanced compared with that of the Mg-9%Al alloy. This improvement could be attributed to obvious grain refinement and the Orowan strengthening mechanism.

Keywords

hot pressing of powder magnesium matrix composite mechanical properties microstructure strengthening mechanism 

Notes

Acknowledgments

The authors gratefully acknowledge the financial support obtained from the National Natural Science Foundation of China (Grant Nos. 51301118 and 51401144), the Projects of International Cooperation in Shanxi (Grant No. 2014081002) and Technological Innovation Programs of Higher Education Institutions in Shanxi (Grant No. 2013108).

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Copyright information

© ASM International 2017

Authors and Affiliations

  • Ming Li
    • 1
    • 2
  • Hongxia Wang
    • 1
    • 2
  • Kaibo Nie
    • 1
    • 2
  • Yiming Liu
    • 1
    • 2
  • Wei Liang
    • 1
    • 2
  1. 1.Shanxi Key Laboratory of Advanced Magnesium based Materials, School of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuanChina
  2. 2.Key Laboratory of Interface Science and Engineering in Advanced MaterialsTaiyuanChina

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