Low-amplitude jump-like deformation of Pb-27 at.% In alloy in superconducting and normal states in the temperature range 1.65-4.2 K

V.P. Lebedev, V.S. Krylovskiy, and S.V. Lebedev

V. Karazin Kharkov National University, 4 Svobody Sq., Kharkov 61077, Ukraine
E-mail: victor.p.lebedev@univer.kharkov.ua
pos Анотація:

Received November 18, 2010, reseived December 24, 2010

For polycrystals of the Pb–27 at.% In alloy the instability of plastic flow of different amplitude was studied in the interval 1,65–4,2 K and in different states of the electronic system. The drops of deformation stress with amplitude δσ_dr = (1–20)·10⁴ Pa and concentration n_dr = 10–250 were observed in the superconducting state of the alloy at temperatures between 4,2 and 2 K. At lower temperatures 2.2–1.65 K the low-amplitude instability manifests itself in the normal state of the alloy with jump amplitude δσ_dr = (1–20)·10⁴ Pa and concentration n_dr = 10–250, against the background of which with developing deformation there occur jumps δσ_dr = 0,5–2 MPa. The mechanisms of jump-like deformation of the alloy in different temperature ranges are discussed.

Key words: deformation stress drop, normal and superconductive state, deformation and impurity defects.

References

1. V. P. Lebedev, V. S. Krylovskii, S. V. Lebedev, and S. V. Savich, Fiz. Nizk. Temp. 34, 300 (2008) V. P. Lebedev, V. S. Krylovskii, S. V. Lebedev, and S. V. Savich, [Low Temp. Phys. 34, 234 (2008)]. CrossRef Google Scholar

2. S. V. Lebedev, Visnyk KhNU, ser. âFizykaâ 865, 69 (2009). Google Scholar

3. V. S. Krylovskii and S. V. Lebedev, in Ninth International Conference on Physical Phenomena in Solids, Kharkiv, 2009, Ñ. 104. Google Scholar

4. V. S. Krylovskii and S. V. Lebedev, Visnyk KhNU, ser. âFizykaâ 915, 102 (2010). Google Scholar

5. A. E. Vol and I. K. Kagan, Structure and Properties of Metal Alloys [in Russian], (Nauka, Moscow, 1976). Google Scholar

6. I. S. Braude, N. V. Isaev, and O. N. Onyshko, Visnyk KhNU, ser. âFizykaâ 739, 164 (2006). Google Scholar

7. V. V. Pustovalov, Fiz. Nizk. Temp. 26, 515 (2000) V. V. Pustovalov, [Low Temp. Phys. 26, 375 (2000)]. CrossRef Google Scholar

8. V. V. Pustovalov, Fiz. Nizk. Temp. 34, 871 (2008) V. V. Pustovalov, [Low Temp. Phys. 34, 683 (2008)]. CrossRef Google Scholar

9. P. B. Volosevich, Ukr. Fiz. Zh. 26, 1154 (1981). CAS Google Scholar

10. M. L. Bernshtein and V. A. Zaimovskii, Mechanical Properties of Metals [in Russian] (Metallurgiya, Moscow, 1979). Google Scholar

11. V. N. Vydashenko and A. I. Landau, Fiz. Tverd. Tela 19, 614 (1977). Google Scholar

12. B. Obst and A. Nyilas, Adv. Cryog. Eng. A 44, 311 (1998). Google Scholar

13. V. I. Startsev, V. Ya. Ilâichev, V. V. Pustovalov, Plasticity and Hardness of Metals and Alloys at Low Temperatures [in Russian] (Metallurgiya, Moscow, 1975). Google Scholar

14. O. V. Klyavin, The Physics of Crystal Plasticity at Helium Temperatures [in Russian] (Nauka, Moscow, 1987). Google Scholar