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Effect of explosive contact and non-contact shock-processing on structure, microstructure and mechanical characteristics of aluminum

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Abstract

Contact and non-contact techniques are used to obtain monoliths of micro-sized aluminum powder under explosive shock loading. The measurement technique involves instrumented detonics to determine the velocity of detonation and compaction of powder in a single-shot experiment. The compacted specimens were examined for crystallographic, micro-strain, particle size, microstructure, mechanical strength, microhardness and density variations. Results indicate that non-contact technique gives rise to uniform thick compacts with negligible change in particle size, micro-strain, microhardness and microstructure with lower density. Whereas the compacts obtained by contact arrangement are accompanied by a substantial change in these parameters with higher density. Compacts of uniform density greater than 98 % theoretical value have been obtained by using explosive mixture of detonation velocity of 4.2 km/s. The compacted specimens possess micro-strain 2.8×10−3, microhardness (60±2)H v, tensile strength of 112 MPa and compressive strength of 116 MPa with elongation up to 6.4 %. Fracture/void free compacts obtained by contact arrangement have tremendous use in materials science and technology.

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Acknowledgements

The authors wish to acknowledge the Defence Research and Development Organization (DRDO), India, for Grant-in-aid project No. ERIP/ER/0703665/M/01/1044. Special thanks go to the University Grants Commission (UGC)—New Delhi, India, for providing Research Fellowship No. F.4-1/2006 (BSR)/11-08/2008. Thanks are also due to the Director of TBRL and the entire trial team for necessary assistance in carrying out the experiments.

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Authors and Affiliations

  1. Materials Research Laboratory, Department of Physics, Himachal Pradesh University, Shimla, 171005, India

    A. D. Sharma & N. Thakur

  2. Terminal Ballistics Research Laboratory, Chandigarh, 160030, India

    A. K. Sharma

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  1. A. D. Sharma
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Sharma, A.D., Sharma, A.K. & Thakur, N. Effect of explosive contact and non-contact shock-processing on structure, microstructure and mechanical characteristics of aluminum. Appl. Phys. A 111, 783–789 (2013). https://doi.org/10.1007/s00339-013-7649-8

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  • DOI: https://doi.org/10.1007/s00339-013-7649-8

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