Abstract
The radiant energy emitted from electrolytic tough pitch copper during plastic tensile elongation was recorded with a photoconductive detection system sensitive to wavelengths from 2 to 30 μm. Radiation measurements were made while Cu samples were deformed at strain rates from 0.56 to 172 s−1. Abrupt changes in emission were correlated with the intermittent plastic action of Lüders bands. It is emphasized that the measurements were of the differences in radiation emitted by nearby points on a sample. The differences in the emitted radiation were due to the inhomogeneous nature of the deformation. A new calibration technique is described that accounts for the optical effects of changes in surface topography and the thermal radiating characteristics of a metal that arise during plastic deformation. This calibration technique was used to associate temperature differences with the radiation measurements and the localized nature of the plasticity. Temperature differences were observed at low average strains that were large enough to imply crack nucleation. Changes in the inhomogeneous temperature-strain data occur at the critical strains that have been reported for many metals. This correlation is very clear at the critical strains of 1.5, 7.5 and 16.4 pct. Whether or not there are real changes at the other critical strains is more speculative.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
J. Erdmann and J. Jahoda: Report D1-82-0384, Boeing Scientific Research Laboratories, Seattle, Washington, Oct., 1964.
A. Nadai and M. J. Manjoine:J. Appl. Mech., 1941, vol. 8, pp. A77-A91.
F. P. Bowden and P. H. Thomas:Proc. Roy. Soc., 1954, vol. 233A, pp. 29–40.
J. W. Taylor:J. Appl. Phys., 1963, vol. 34, pp. 2727–31.5. N. C. Small:Proc. of Infrared Session, Symposium, Soc. for Nondestructive Testing, Raytheon Co., Wayland, Massachusetts, 1966.
P. J. King, D. F. Cotgrove, and P. M. B. Slate:Behavior of Dense Media Under High Dynamic Pressure, p. 513, Gordon and Breach, New York, 1968.
Paul A. Urtiew and Richard Grover:Temperature, Its Measurement and Control in Science and Industry, vol. 4, part I, H. H. Plumb, ed., p. 677, Instrument Society of America, Pittsburgh, 1972.
R. K. Linde and D. G. Doran:Nature, 1966, vol. 212, pp. 27–29.
V. A. Phillips, A. J. Swain, and R. Eborall:J. Inst. Metals, 1952, vol. 81, pp. 625–47.
C. E. Mobley, Jr.: Ph.D. Thesis, Johns Hopkins University, 1968.
J. F. Bell:The Physics of Large Deformation of Crystalline Solids, pp. 33 and 77, Springer-Verlag, New York, 1968.
T. N. Rhodin, Jr.:J. Amer. Chem. Soc., 1950, vol. 72, p. 5102.
G. L. Moss: Ph.D. Thesis, Johns Hopkins University, 1972.
Lord Kelvin:Trans. Roy. Soc. Edinburgh, 1851; Mathematical and Physical Papers, vol. III, pp. 236–38, C. J. Clay and Sons, Cambridge University Press Warehouse, London, 1890.
R. M. Fisher and J. S. Lally: Can.J. Phys., 1967, vol. 45, pp. 1147–59.
J. F. Bell:The Physics of Large Deformation of Crystalline Solids, pp. 205–12, Springer-Verlag, New York, 1968.
W. N. Sharpe, Jr.:J. Mech. Phys. Solids, 1966, vol. 14, p. 187.
A. Nadai:Theory of Flow and Fracture of Solids, vol. 1, pp. 275–96, McGraw- Hill, New York, 1950.
A. W. McReynolds:Trans. AIME, 1949, vol. 185, pp. 32–45. (Metals Technology, January 1949, pp. 32-45.)
F. Seitz:Advan. Phys., 1952, vol. 1, pp. 43–90.
J. D. Eshelby and P. L. Pratt:Acta Met., 1956, vol. 4, pp. 560–62.
A. M. Fruedenthal and J. H. Weiner:J. Appl. Phys., 1956, vol. 27, pp. 44–50. $
Author information
Authors and Affiliations
Additional information
This paper is based on a portion of a thesis submitted by Gerald L. Moss in partial fulfillment of the requirements of the degree of Doctor of Philosophy at The Johns Hopkins University.
Rights and permissions
About this article
Cite this article
Moss, G.L., Pond, R.B. Inhomogeneous thermal changes in copper during plastic elongation. Metall Trans A 6, 1223–1235 (1975). https://doi.org/10.1007/BF02658532
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02658532