Densification behaviour of sintered aluminum composites during hot deformation

Sumesh Narayan; Ananthanarayanan Rajeshkannan; Sumesh Narayan; Ananthanarayanan Rajeshkannan

doi:10.3934/matersci.2018.5.902

AIMS Materials Science

2018, Volume 5, Issue 5: 902-915. doi: 10.3934/matersci.2018.5.902

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Research article

Densification behaviour of sintered aluminum composites during hot deformation

Sumesh Narayan ^{1
,
,},
Ananthanarayanan Rajeshkannan ²

1.
Senior Lecturer, Mechanical Engineering, School of Engineering and Physics, Faculty of Science, Technology & Environment, The University of the South Pacific, Laucala Campus, PO Box 1168, Suva, FIJI
2.
Associate Professor, Mechanical Engineering, School of Engineering and Physics, Faculty of Science, Technology & Environment, The University of the South Pacific, Laucala Campus, PO Box 1168, Suva, FIJI

Received: 07 July 2018 Accepted: 09 August 2018 Published: 12 September 2018

In this study, an investigation on the densification behavior and forming limit of powder metallurgy composites containing hard carbide particles were carried out. The selected composite materials are Al4TiC, Al4WC, Al4Fe₃C and Al4Mo₂C. The compacts of 0.82 and 0.86 relative density and 0.4 and 0.6 aspect ratio were prepared on a 1-MN capacity hydraulic press using suitable die-set assembly. Sintering was carried out at 594 ℃ for 60 minutes in an electrical muffle furnace. Hot upsetting was carried out at the sintering temperature immediately after the sintering process and the forming process was stopped once visible cracks were seen on the free surface. Flat dies on the upper and lower surface were employed under dry friction conditions during hot upsetting. Finally, the densification behavior and forming limit of sintered-forged aluminium composite preforms is presented in this research work. It was concretely noted that Al4TiC produced the best density amongst all the above mentioned aluminium composites. Further, it was seen that Al4Mo₂C and Al4WC produced good final height and diameter strain at fracture.
- densification,
- forming limit,
- aluminium composite,
- hot forging,
- powder metallurgy
Citation: Sumesh Narayan, Ananthanarayanan Rajeshkannan. Densification behaviour of sintered aluminum composites during hot deformation[J]. AIMS Materials Science, 2018, 5(5): 902-915. doi: 10.3934/matersci.2018.5.902

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Abstract

In this study, an investigation on the densification behavior and forming limit of powder metallurgy composites containing hard carbide particles were carried out. The selected composite materials are Al4TiC, Al4WC, Al4Fe₃C and Al4Mo₂C. The compacts of 0.82 and 0.86 relative density and 0.4 and 0.6 aspect ratio were prepared on a 1-MN capacity hydraulic press using suitable die-set assembly. Sintering was carried out at 594 ℃ for 60 minutes in an electrical muffle furnace. Hot upsetting was carried out at the sintering temperature immediately after the sintering process and the forming process was stopped once visible cracks were seen on the free surface. Flat dies on the upper and lower surface were employed under dry friction conditions during hot upsetting. Finally, the densification behavior and forming limit of sintered-forged aluminium composite preforms is presented in this research work. It was concretely noted that Al4TiC produced the best density amongst all the above mentioned aluminium composites. Further, it was seen that Al4Mo₂C and Al4WC produced good final height and diameter strain at fracture.

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