Conference Papers

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    Processing of primary silicon and mg2si reinforced hybrid functionally graded aluminum composites by centrifugal casting
    (Trans Tech Publications Ltd ttp@transtec.ch, 2012) Raghunandan, S.; Akber Hyder, J.; Rajan, T.P.D.; Prabhu, K.N.; Pai, B.C.
    In the present investigation, FGMs of mono-dispersed in-situ primary Si and their hybrids with mg2si reinforcements have been fabricated by the centrifugal casting process using 390 commercial Al alloy. Hard primary silicon particles are formed during the solidification of the 390 alloy and mg 2si reinforcements are formed by the addition of varying amount of magnesium into the A390 aluminium alloy. Owing to the difference in density both primary silicon and mg2si gets segregated towards the inner periphery during centrifugal casting. The size of the mg2si in-situ reinforcement phase is relatively smaller and is distributed in the edges of primary silicon particles and also individually in the matrix. The in-situ mg2si and primary silicon can significantly increase the hardness and strength of the inner periphery of the casting. Higher Mg contents have been observed to introduce significant porosity leading to poor castings. Addition of phosphorous to the melt has led to the modification and refinement of primary Si morphology and also helped in the reduction of shrinkage porosity. Maximum hardness of 167 BHN is observed towards the inner periphery of the 390Al-2.5%Mg added in-situ composite. © (2012) Trans Tech Publications.
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    Centrifugal casting and characterisation of primary silicon and Mg2Si dispersed aluminium functionally graded materials
    (Trans Tech Publications Ltd ttp@transtec.ch, 2015) Midhun Krishnan, P.; Sanil, S.; Jayakumar, E.; Rajan, T.P.D.; Prabhu, K.
    Aluminium based FGM rings, reinforced by in-situ primary Si and primary Si/ Mg2Si hybrid reinforcement were successfully fabricated by centrifugal casting and micro structural, chemical, hardness and corrosion characteristics were evaluated. It was observed that in Al-20Si ring the primary Si particles were present mostly in inner region and few in outer region where as in Al-20Si-3Mg ring both the primary silicon and Mg2Si were completely found in the inner region only resulting in a graded FGM structure. The hardness values were measured along radial direction of samples and variations corresponding to micro structural variation were analysed. Optical Emission spectroscopic studies have revealed the remarkable compositional changes along radial direction. Corrosion characteristics were also evaluated both in particle rich and depleted regions. © (2015) Trans Tech Publications, Switzerland.