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Characterization and strengthening mechanism of SiC nanoparticles reinforced magnesium matrix composite fabricated by ultrasonic vibration assisted squeeze casting

Published online by Cambridge University Press:  31 May 2017

Kaibo Nie Open the ORCID record for Kaibo Nie [Opens in a new window] ,
Kunkun Deng ,
Xiaojun Wang  and
Kun Wu
Kaibo Nie*
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, People’s Republic of China
Kunkun Deng
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, People’s Republic of China
Xiaojun Wang
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Kun Wu
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: kaibo.nie@gmail.com, niekaibo2015@163.com
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Abstract

SiC nanoparticles reinforced magnesium matrix composite was fabricated by ultrasonic vibration assisted squeeze casting. Since ultrasonic device could meet the use requirements according to theoretic calculation, uniform dispersion of SiC nanoparticles was expected to achieve. The grains of the composite were refined compared with the AZ91 alloy, which was related to the increase of nucleation sites during solidification and Zenner pinning effect caused by SiC nanoparticles. With increasing the ultrasonic power, grain size of the composite changed no obviously while the morphology of β-Mg17Al12 phase was significantly affected. The ultimate tensile strength, yield strength, and elongation to fracture of the composites fabricated under different ultrasonic powers were simultaneously improved compared with the AZ91 alloy. The increase of yield strength could be attributed to Hall–Petch strengthening and Orowan strengthening for the present composites. Theoretical value of the yield strength obtained by the square root method was close to the experimental value.

Keywords

magnesium matrix compositeultrasonic vibration assisted squeeze castingmicrostructurestrengthening mechanism
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 13 , 14 July 2017 , pp. 2609 - 2620
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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