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Densification and deformation studies on powder metallurgyAl–TiO2–Gr composite during cold upsetting

Published online by Cambridge University Press:  10 July 2014

Manickam Ravichandran ,
Abdullah Naveen Sait  and
Veeramani Anandakrishnan
Manickam Ravichandran
Affiliation:
Department of Mechanical Engineering, Chendhuran College of Engineering and Technology, Pudukkottai 622 507, Tamilnadu, India
Abdullah Naveen Sait*
Affiliation:
Department of Mechanical Engineering, Chendhuran College of Engineering and Technology, Pudukkottai 622 507, Tamilnadu, India
Veeramani Anandakrishnan
Affiliation:
Department of Production Engineering, National Institute of Technology, Tiruchirappalli 620 015, Tamilnadu, India
*
a)Address all correspondence to this author. e-mail: naveensait@yahoo.co.in
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Abstract

Aluminum metal matrix hybrid composites were synthesized through powdermetallurgy route from ball milled powders to yield the compositions: Al+ 0% TiO2, Al + 2.5% TiO2, Al +2.5% TiO2 + 2% Gr, and Al + 2.5% TiO2+ 4% Gr. The densification and deformation properties of sinteredAl–TiO2–Gr composites during cold upsettingwere investigated experimentally. The powder preforms are compacted usingsuitable punch and die in 40 kN hydraulic press and the initial percentagetheoretical density was maintained as 85%. Sintering was done in an electricmuffle furnace at the temperature of 590 °C for a period of 3 h. Thesintered preforms were subjected to incremental compressive loading of 10 kNuntil cracks were found at the free surface. The true axial stress(σz), true hoop stress(σθ), true hydrostatic stress(σm), and true effective stress (σeff)were calculated for all the preforms and all these stresses are correlated withthe true axial strain (εz). The densification behaviors ofthe composites were studied against true axial strain (εz)and lateral strain. Better densification and deformation property were obtainedfor pure aluminum preforms compared with other composite preforms. Addition ofTiO2 to the pure Al and Gr reinforcements increases the strengthcoefficient of the Al–TiO2 composite.

Keywords

metal matrix compositesTiO2cold upsettingpowder metallurgyaluminum

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Type
Articles
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Journal of Materials Research , Volume 29 , Issue 13 , 14 July 2014 , pp. 1480 - 1487
Copyright
Copyright © Materials Research Society 2014 

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References

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