Abstract
The mechanical properties and the dislocation structure of Ni3Ge alloy single crystals have been experimentally studied at low temperatures. It is found that the flow stresses increase beginning with 4.2 K, and the observed rise in the stresses depends on the orientation of the strain axes of the crystals. The dislocation structure is investigated thoroughly. It is revealed that the mean density of dislocations and the interdislocation interaction parameter α anomalously increase as the temperature increases in the range 4.2–293 K. The mechanisms providing an explanation for the temperature anomaly of flow stresses and the α parameter are considered. The activation energy of thermal hardening is evaluated. It is assumed that the low activation energies of thermal hardening are due to the motion of dislocations at velocities close to the velocity of sound at these temperatures.
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References
T. Takasugi and M. Yoshida, Philos. Mag. A 67, 447 (1993).
V. A. Starenchenko, Yu. V. Solov’eva, Yu. A. Abzaev, et al., Fiz. Tverd. Tela (S.-Peterburg) 38, 3050 (1996) [Phys. Solid State 38, 1668 (1996)].
H.-R. Pak, T. Saburi, and S. J. Nenno, J. Jpn. Inst. Met. 39, 1215 (1975).
B. H. Kear and H. G. B. Wilsdorf, Trans. Metall. Soc. AIME 224, 382 (1962).
R. A. Mulford and D. P. Pope, Acta Metall. 21, 1375 (1973).
D. Caillard, N. Clement, and A. Couret, Philos. Mag. Lett. 58, 263 (1988).
A. Korner, H. P. Karntaler, and C. Hitzenberger, Philos. Mag. 56, 73 (1987).
P. A. Flinn, Trans. Metall. Soc. AIME 218, 145 (1960).
J. P. Hirth and J. Lothe, Theory of Dislocations (McGraw-Hill, New York, 1967; Atomizdat, Moscow, 1972).
L. E. Popov, V. A. Starenchenko, and S. V. Kolupaeva, Model. Mekh. 3, 123 (1989).
L. E. Popov, V. S. Kobytev, and T. A. Kovalevskaya, Plastic Deformation in Alloys (Metallurgiya, Moscow, 1984).
V. S. Kobytev, V. A. Starenchenko, S. P. Zhukovskii, and V. P. Chubis, Atomic Ordering and Its Influence on the Properties of Alloys (Tomsk, 1978).
V. A. Starenchenko, V. S. Kobytev, and L. E. Popov, Available from VINITI No. 299-78 (TISI, Tomsk, 1978).
V. A. Starenchenko, Yu. A. Abzaev, and L. G. Chernykh, Metallofizika (Kiev) 8, 22 (1987).
V. I. Al’shits and V. G. Indenbom, Dynamics of Dislocations (Naukova Dumka, Kiev, 1978).
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Translated from Fizika Tverdogo Tela, Vol. 42, No. 11, 2000, pp. 2017–2023.
Original Russian Text Copyright © 2000 by Starenchenko, Solov’eva, Nikolaev, Shpe\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \)zman, Smirnov.
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Starenchenko, V.A., Solov’eva, Y.V., Nikolaev, V.I. et al. Thermal hardening of Ni3Ge alloy single crystals with an L12 superstructure at low temperatures. Phys. Solid State 42, 2076–2082 (2000). https://doi.org/10.1134/1.1324042
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DOI: https://doi.org/10.1134/1.1324042