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Analysis of hot deformation behavior and microstructure evolution of as-cast SiC nanoparticles reinforced magnesium matrix composite

Published online by Cambridge University Press:  11 October 2016

Ting Wang ,
Kai-bo Nie Open the ORCID record for Kai-bo Nie [Opens in a new window] ,
Kun-kun Deng  and
Wei Liang
Ting Wang
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, People's Republic of China
Kai-bo Nie*
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, People's Republic of China; and Shanxi Key Laboratory of Advanced Magnesium-Based Materials, Taiyuan University of Technology, Taiyuan 030024, People's Republic of China
Kun-kun Deng
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, People's Republic of China; and Shanxi Key Laboratory of Advanced Magnesium-Based Materials, Taiyuan University of Technology, Taiyuan 030024, People's Republic of China
Wei Liang
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, People's Republic of China; and Shanxi Key Laboratory of Advanced Magnesium-Based Materials, Taiyuan University of Technology, Taiyuan 030024, 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

The hot deformation behavior of as-cast AZ91 magnesium alloy reinforced by SiC nanoparticles (SiCp/AZ91 nanocomposite) was investigated using hot compression test. Compared with unreinforced AZ91 alloy, peak stress of the SiCp/AZ91 nanocomposite achieved faster and high temperature deformation ability which was enhanced by the addition of SiC nanoparticles. The values of n for the AZ91 alloy and nanocomposite were 6.9 and 4.6, while the values of Q were 207.96 kJ/mol and 184.6 kJ/mol, respectively. The processing map showed the optimum processing conditions for the nanocomposite mainly concentrated at 523–673 K/0.018–0.001 s−1 and the maximum power dissipation efficiency was found to be 36% at a temperature of 673 K and the strain rate of 0.001 s−1. Based on the constitutive equation and processing map, the deformation mechanism for the present nanocomposite should be dominated by the mechanism of dynamic recrystalization.

Keywords

magnesium matrix nanocompositeprocessing mapconstructive equationactivation energy
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 21 , 14 November 2016 , pp. 3437 - 3447
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Copyright
Copyright © Materials Research Society 2016 

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Footnotes

Contributing Editor: Michele Manuel

References

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