THE TENSILE PROPERTIES OF P/M ALUMINIUM REINFORCED SHORT FIBRE ALUMINA SAFFILTM.

Derman*, Z.A. Ahmad, L.B. Hussain and N.M. Sharif

  • Mohd Nazree Derman

Abstract

THE TENSILE PROPERTIES OF P/M ALUMINIUM REINFORCED SHORT FIBRE ALUMINA SAFFILTM.

Derman*, Z.A. Ahmad, L.B. Hussain and N.M. Sharif

School of Material and Mineral Resources Engineering,

Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Pulau Pinang.

The microstructure and mechanical properties of aluminium reinforced with short fibre alumina SaffiITM (Al203(sf)) prepared via powder metallurgy (P/M) technique were studied. Flaky aluminium (Al) powder was mixed with different weight percentages of short fibre alumina SaffilTM (from Swt % to 25 wt %) by dry mixing using a ball mill. The mixtures were uniaxially pressed at 210 MPa. Specimens were sintered for 7 hours at 600 °C under normal atmosphere. The optical microscope (OM) and scanning electron microscope (SEM) were used to study the fracture surface of specimens. Specimens were tested by tensile test according to ASTM B 577 standard to determine the strength and elastic modulus. The effects of different weight percentage of short fibre alumina SaffilTM to the tensile strength and modulus of elasticity were studied. The optical microscope observation showed good reinforcement distribution in composite specimens containing 5 wt% to 15 wt% Al203(sf) compared to composite specimens containing 20 wt% and 25 wt% Al203(sf) composites. The specimen containing 15 wt % Al203(sf) showed the maximum tensile strength and elastic modulus of 48.5 MPa and 24.58 GPa at room temperature. The composite specimen containing 25 wt% Al20 ,(sf) showed the lowest tensile strength and elastic modulus (18.98 MPa and 19.52 GPa). Based on the graph, tensile strength and elastic modulus of aluminium increases with increasing weight percentage of Al203(sf). However, tensile strength and elastic modulus decreases for composite specimens containing 20 wt% Al203(4) and 25 wt% Al203(sf). SEM showed fibre breakage and pull-out with some intergranular failure in the matrix for all composites.

* Corresponding author's E-mail: d_mohd_nazree@yahoo.com (Mohd Nazree Derman)

Published
2015-12-01
Section
Original Research Articles