Abstract
This work focuses on the synthesis of nano-structured Al6061 using machining under plane strain and evaluation of its mechanical properties. It discusses an unusual application of the machining process by using it as a severe plastic deformation (SPD) process to develop nano-structured or ultra-fine grained materials. Chips obtained from this process show higher hardness than the bulk material which is in agreement with results reported in existing literature. Chips with minimum curvature have been obtained using restricted contact tool and extrusion-machining processes. Hardness of the straight chips obtained by the stated methods, though higher than the bulk material, was less than the hardness of the curled chips obtained from conventional orthogonal machining. Furthermore, hardness of the chips obtained using tool with restricted contact length of 0.6mm showed lesser variation. Hence they were used to prepare samples for the tensile test. A novel method was used to prepare small test specimens from chips to measure tensile strength. Specimens made from the chips had higher ultimate tensile strength (53%) and yield strength (85%) than that of bulk material. Improvement in strength was accompanied by a reduction in ductility (58%) for chips as compared to bulk material. It was observed that for both the chip and the bulk material, the reduction in gauge length leads to lower values of Young s modulus showing size effect.
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Acknowledgements
Authors would like to thank the following laboratories at IIT Madras for providing facilities for the experimental work: Manufacturing Engineering Section (Mechanical Engineering Dept.), Physical Metallurgy Laboratory (Metallurgy and Material Science Dept.) and Structures Laboratory (Civil Engineering Dept.). Authors would also like to thank Frontier life line pvt. ltd., Chennai for permitting us to use their INSTRON 3345 tensile testing machine.
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© 2013 The Society for Experimental Mechanics
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Ghangrekar, P.S., Murthy, H., Rao, B.C. (2013). Evaluation of Mechanical Properties of Nano-structured Al6061 Synthesized Using Machining. In: Shaw, G., Prorok, B., Starman, L. (eds) MEMS and Nanotechnology, Volume 6. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-4436-7_16
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DOI: https://doi.org/10.1007/978-1-4614-4436-7_16
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