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Mechanical and microstructure properties of deformed Al–Al2O3 nanocomposite at elevated temperature

Published online by Cambridge University Press:  30 January 2017

H.R. Ezatpour ,
S.A. Sajjadi ,
A. Chaichi  and
G.R. Ebrahimi
H.R. Ezatpour
Affiliation:
Faculty of Engineering, Sabzevar University of New Technology, Sabzevar, Iran
S.A. Sajjadi
Affiliation:
Department of Materials Science and Metallurgical Engineering, Engineering Faculty, Ferdowsi University of Mashhad, Mashhad, Iran
A. Chaichi
Affiliation:
Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran
G.R. Ebrahimi*
Affiliation:
Department of Materials and Polymer Engineering, Hakim Sabzevari University, Sabzevar, Iran
*
a)Address all correspondence to this author. e-mail: R_Ebrahimi2000@yahoo.com
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Abstract

Hot isotherm compression tests were performed in temperature range of 350–500 °C and at strain rates of 0.0005 to 0.5 s−1 for Al6061 alloy reinforced with alumina nanoparticles. Effect of deformation parameters and optimal conditions for hot working this nanocomposite were comprehended thoroughly via hot working data analyses, electron microscopy images, and X-ray diffractograms. The results indicated the severity of hot deformation process and an increase in the activation energy to 320 kJ/mol due to the addition of nanoparticles. Dynamic recovery (DRV) was considered as the individual determinative softening mechanism during hot deformation of this nanocomposite, and no sign of dynamic recrystallization (DRX) phenomenon observed in the same domain. The unstable region occurred at high strain rates and temperature range of 350–500 °C accompanied with happening drastic defects such as shear bands and cracks. Furthermore, the value of both critical strain and critical stress increased with increasing the strain rate and alumina addition. On the other hand, increasing the temperature decreased the value of critical strain and facilitated the initiation of softening mechanisms.

Keywords

aluminum metal matrix nanocompositehot deformation parameterssoftening mechanismstexture analysis
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 6 , 28 March 2017 , pp. 1118 - 1128
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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