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Densification and deformation studies on powder metallurgy Al–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: [email protected]
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Abstract

Aluminum metal matrix hybrid composites were synthesized through powder metallurgy 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 sintered Al–TiO2–Gr composites during cold upsetting were investigated experimentally. The powder preforms are compacted using suitable punch and die in 40 kN hydraulic press and the initial percentage theoretical density was maintained as 85%. Sintering was done in an electric muffle furnace at the temperature of 590 °C for a period of 3 h. The sintered preforms were subjected to incremental compressive loading of 10 kN until 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 with the true axial strain (εz). The densification behaviors of the composites were studied against true axial strain (εz) and lateral strain. Better densification and deformation property were obtained for pure aluminum preforms compared with other composite preforms. Addition of TiO2 to the pure Al and Gr reinforcements increases the strength coefficient of the Al–TiO2 composite.

Keywords

metal matrix compositesTiO2cold upsettingpowder metallurgyaluminum
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 13 , 14 July 2014 , pp. 1480 - 1487
Copyright
Copyright © Materials Research Society 2014 

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