Evaluation of Cast Al-Si-Fe alloy/Coconut Shell Ash Particulate Composites

S.Y. AKU, D.S. YAWAS, Apasi ADOKMA
1.897 640

Abstract


Al-7wt%Si-2wt%Fe alloy/Coconut shell ash(CSAp) composites having 3-15wt%coconut shell ash were fabricated by double stir-casting method.  The microstructure, hardness values and density of the composites were evaluated. The density of the composites decreased as the percentage of coconut shell ash increases in the aluminum alloy. This means that composites of lower weight component can be produced by adding CSAp.  Microstructural analysis showed fairy distribution of coconut shell ash particles in the aluminum alloy. The presence of the coconut shell ash particles in the matrix alloy resulted in a much smaller grain size in the cast composites compared to the matrix alloy as confirmed from X-ray diffractometer analysis. Significant improvement in hardness values is noticeable as the wt% of the coconut shell ash increased in the alloy. Hence, this work has established that incorporation of   coconut shell particles in aluminum matrix can lead to the production of low cost aluminum composites with improved hardness values.

 

 

Key words: Aluminum alloy, Coconut shell ash, Density,

Microstructure and Hardness values


Keywords


Aluminum alloy, Coconut shell ash, Density, Microstructure and Hardness values

Full Text:

PDF

References


Aigbodion, V.S., Hassan, S.B., “Effects of silicon carbide reinforcement on microstructure and properties composites”, Journal of Materials Science and Engineering A, 447355-360 (2007). particulate

Prasad, D., Krishna, A . , “ Fabrication and Characterization of A356.2-Rice Husk Ash Composite International Journal Of Science Eng.ring And Technology, 2(12):7603-7608(2010). technique”, thesis Department of Mechanical

Harun, M.B., Shamsudin, S.R., Yazid, H., Selemat, Z., Jalil, M., “Effects of Fly Ash particle Reinforcement on Microstructure, Porosity and Hardness Malaysian Institute for Nuclear Technology, AJSTD,23(1&2):113-122(2006). composite”,

Rajan, T.P.D., Pillai, R.M., Pai, B.C., Satyanarayana, K.G., Rohatgi, P.K., “ Fabrication and characterization of Al–7Si–0.35Mg/fly ash metal matrix composites processed by different stir casting routes”, Composites Science and Technology, 67: 3369–3377(2 0 0 7 ) . 457

Rohatgi, P.K., Guo, R. Q., Keshavara, B.N., “Cast aluminium Engineering Materials, 104–107:283–92(1995). ash composites”,Key

Ejiofor, J.U., Reddy, R.G., “Developments in the processing and properties of particulate Al-Si composites”, JOM Publication Of Minerals, Metals And Materials Society, 49(11): 31-37 (1997).