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Effects of strain rate and elevated temperature on electromagnetic radiation emission during plastic deformation and crack propagation in ASTM B 265 grade 2 titanium sheets

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Abstract

Some basic aspects of electromagnetic radiation (EMR) emission during quasi-static plastic deformation and crack propagation in ASTM B 265 grade 2 titanium sheets are reported in this paper. It has been observed that titanium emits several intermittent EMR signals starting near the yield and continuing up to fracture. The EMR emissions are sensitive to the applied strain rates. The number of EMR emissions shows a parabolic variation with strain rate, exhibiting a maxima. It appears that the temporary pinnings of the dislocations injected from the crack tip, which is essential for the emission of EMR as described in a recent model by the authors, do not adequately occur at high as well as low strain rates. At elevated temperatures, the square of the EMR amplitude is observed to be proportional to \( \exp {\left( { - {mU} \mathord{\left/ {\vphantom {{mU} {kT}}} \right. \kern-\nulldelimiterspace} {kT}} \right)}, \) where U is the activation energy for the movement of jogs, k the Boltzmann constant, T the temperature and m ≤ 1.0.

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Acknowledgement

Research grant from the Department of Science and Technology, Government of India, is gratefully acknowledged.

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  1. Department of Mechanical Engineering, Birla Institute of Technology, Mesra, Ranchi, 835 215, India

    V. S. Chauhan & Ashok Misra

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  1. V. S. Chauhan
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  2. Ashok Misra
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Correspondence to V. S. Chauhan.

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Chauhan, V.S., Misra, A. Effects of strain rate and elevated temperature on electromagnetic radiation emission during plastic deformation and crack propagation in ASTM B 265 grade 2 titanium sheets. J Mater Sci 43, 5634–5643 (2008). https://doi.org/10.1007/s10853-008-2590-5

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