Browsing by Author "Kiran Aithal, S."

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    Effect of Lateral Vibrations during Directional solidification on Mechanical Properties of Al-18%wt Si Alloys
    (Elsevier Ltd, 2018) Ramesh Babu, N.; Ramesh, M.R.; Kiran Aithal, S.; Kotresh, K.
    Experimental Investigation on the effect of mold vibration on the mechanical properties of Al-18%WtSi have been carried out using Taguchi Technique, as the molten metal at 750°C is poured in to the insulated mold which is subjected to lateral vibrations, directional solidification takes place due to the presence of chill at the bottom which gives rise to a functionally graded alloy. Due to the excitation, silicon present in the molten metal precipitates along its length. The castings are prepared with varying chill materials and chill volumes without vibrations and with a vibrating frequency of 50Hz. ANOVA was applied to optimize the process parameters. Hardness and Tensile test for the samples was carried out. Improvements in the properties can be attributed to the grain refinement of the casting prepared under vibrations. © 2017 Elsevier Ltd.
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    Influence of vibrations during directional solidification on microstructure, hardness and strength of Al-Si-graphite FG composite
    (Bangladesh University of Engineering and Technology, 2019) Ramesh Babu, N.; Ramesh, M.R.; Kiran Aithal, S.
    The present work aims to synthesize functionally Graded (FG) composites through directional solidification (DS) in combination with lateral vibrations. Directional solidification is one of the effective processing techniques to synthesize FG composite. Due to the advancements in developing new class of materials, DS has become one of the important processing techniques in order to attain the gradation in properties. To achieve the better gradation of properties in Al-Si alloy, Chill was placed at the bottom of the mold which is subjected to lateral vibrations. FG composites produced showed that better hardness was obtained towards the region where primary Silicon (Si) is precipitated. In contrast diametrical compression strength results revealed that the Si rich region is brittle in nature when compared to the other end of the cast which is ductile in nature. Microstructural study also revealed that gradation in properties has taken place from bottom to top portion due to precipitation of Si. © 2019 Bangladesh University of Engineering and Technology. All rights reserved.