Summary
Two experimental works concerning the behaviour of dislocations at high rates of strain in polycrystalline OFHC copper are reported. The first work is time resolved measurements of the ultrasonic attenuation and velocity in specimens undergoing dynamic deformation. The highest strain rate imposed was about 80 /sec. From the ultrasonic data the density of the mobile dislocations was estimated as a function of the strain rate. The second work is measurements of the flow stress in a strain rate range from 1 × 103 to 2.5 × 104 /sec and at 293°, 573° and 773° K. A sharp increase in the strain rate sensitivity which means a transition in the rate controlling mechanism appeared at a strain rate of about 1 × 104 /sec. The behaviour of dislocations in this transition range is discussed.
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© 1979 Springer-Verlag, Berlin/Heidelberg
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Shioiri, J., Satoh, K., Nishimura, K. (1979). Experimental Studies on the Behaviour of Dislocations in Copper at High Rates of Strain. In: Kawata, K., Shioiri, J. (eds) High Velocity Deformation of Solids. International Union of Theoretical and Applied Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-67208-8_5
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DOI: https://doi.org/10.1007/978-3-642-67208-8_5
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