Abstract
The macroscopic activation energy for the initiation of the serrations which are characteristic of the Portevin-Le Chatelier Effect in hydrogenated nickel, was found to be 0.59 ev at 0.21 at. pct H. This differs markedly from the 0.33 ev previously reported by earlier workers.1 Also, it differs from activation energy for hydrogen diffusion in nickel,Q D , which is reported to be 0.42 ev.13 The difference between the macroscopic activation energy for the disappearance (Q U ) and initiation of the serrations (Q L ) was found to be approximately equal to the binding energy of hydride to dislocations (ΔE), of 0.14 ev. The concentration dependence for the initiation and disappearance of serrations was found to approach a saturation level at approximately 0.08 at. pct H. The dominant dislocation locking mechanism responsible for the serrated yielding is thought to be one involving the drift flow of hydrogen to dislocations under an electrical driving force and the ultimate precipitation of the hydride. Electron microscopy has confirmed that an enhanced dislocation multiplication accompanies serrated yielding in hydrogenated nickel.
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T. Boniszewski and G. C. Smith:Acta Met., 1963, vol. 11, pp. 165–78.
B. A. Wilcox and G. C. Smith:Acta Met., 1964, vol. 12, pp. 371–76.
B. A. Wilcox and G. C. Smith:Acta Met., 1965, vol. 13, pp. 331–43.
A. S. Keh, Y. Nakada, and W. C. Leslie:Dislocation Dynamics, pp. 381–408, McGraw-Hill, New York, 1968.
J. S. Blakemore, W. A. Oates and E. O. Hall:Trans TMS-AIME, 1968, vol. 242, pp. 332–33.
M. A. Adams:J. Sci. Instr., 1959, vol. 36, pp. 444–46.
J. S. Blakemore and E. O. Hall:Trans. TMS-AIME, 1968, vol. 242, pp. 333–35.
A. Portevin and F. Le Chatelier:Acad. Sci. Compt. Rendus, vol. 175, 1923, pp. 507–09.
J. P. Hirth:Dislocation Dynamics, p. 407, McGraw-Hill, New York, 1968.
R. Stickler and R. J. Engle:J. Sci. Inst., vol. 40, 1963, pp. 518–20.
A. F. Rowcliffe:J. Inst. Metals, vol. 94, 1964, pp. 263–64.
N. D. Greene:Corrosion, 1959, vol. 15, pp. 369–72.
Y. Ebisuzaki, W. J. Kass, and M. O'Keefe:J. Chem. Phys., 1967, vol. 46, pp. 1378–81.
A. H. Cottrell:Dislocations and Plastic Flow in Crystals, p. 141, Oxford, 1953.
T. Boniszewski and G. C. Smith:Phys. Chem. Solids, 1961, vol. 21, pp. 115–18.
B. E. P. Beeston, I. L. Dillamore, and R. E. Smallman:Metal Sci. J., 1968, vol. 2, pp. 12–14.
I. Isenberg:Phys. Rev., 1950, vol. 79, pp. 736–37.
A. C. Makrides:J. Phys. Chem., 1964, vol. 68, pp. 2160–69.
Y. Ebisuzaki and M. O'Keefe:Progress in Solid State Chemistry, p. 187, vol. 4, 1967.
A. H. Cottrell, S. C. Hunter, and F. R. N. Nabarro:Phil. Mag., 1953, vol. 44, pp. 1064–68.
A. Sugiyama:J. Phys. Soc. Japan, 1966, vol. 21, no. 10, pp. 1873–80.
N. F. Mott:Proc. Camb. Phil. Soc., 1936, vol. 32, pp. 218–90.
N. F. Mott:Proc. Phys. Soc. (London), 1935, vol. 47, pp. 571–80.
J. Friedel:Advances in Physics 1954, vol. 3, no. 12, pp. 446–507.
B. R. Coles:J. Inst. Metals, 1956, vol. 84, pp. 346–48.
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J. S. BLAKEMORE, formerly International Nickel Research Fellow, Department of Metallurgy, University of Newcastle, N.S.W., Australia,
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Blakemore, J.S. The Portevin-Le Chatelier Effect in hydrogenated nickel. Metall Trans 1, 145–149 (1970). https://doi.org/10.1007/BF02819254
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DOI: https://doi.org/10.1007/BF02819254