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Mechanical Characterisation Of Aluminium Bronze-Iron Granules Composite

Journal: International Journal of Scientific & Technology Research (Vol.2, No. 4)

Publication Date:

Authors : ; ; ; ;

Page : 179-185

Keywords : Keywords- Aluminium-bronze; iron millscale IMS; mechanical properties; kappa-phase;

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Abstract

ABSTRACT- Despite some of the desirable characteristics most aluminium bronze exhibits abysmally deficient responses in certain critical applications necessitate mechanical properties enhancement. Hence the microstructure and mechanical properties of cast aluminium bronze reinforced with iron granules millscale were investigated in this paper. Cast samples of the composite made from metal mould contain millscale in varied amount from 2-10 wt.. The samples were homogenised at 11000C for 10 minutes in order to relief the as-cast structures. Standard specimens were prepared from these homogenised samples for tensile charpy impact and microhardness tests while the composite microstructures were studied using an optical microscope. Results show that optimum improved mechanical properties were achieved at 4 wt. millscale addition with ultimate tensile strength UTS of 643.8MPa which represents 10.1 improvement over conventional aluminium-bronze. The composite also demonstrated impact resilence of 83.9J and micro-hardness value of 88.7HRB. Millscale presence in the aluminium bronze system induced a stable reinforcing kappa phase by nucleation mechanism which resulted to enhancement of mechanical properties. However the composite properties were impaired on millscale addition above 4 wt. due to grain clustering.

Last modified: 2013-08-10 23:33:59