Influence of neutron irradiation on the martensitic transformations and shape-memory effect in a TiNi alloy |
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| Authors: | R. F. Konopleva I. V. Nazarkin V. L. Solovei V. A. Chekanov S. P. Belyaev A. E. Volkov A. I. Razov |
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| Affiliation: | (1) St. Petersburg Nuclear Physics Institute, 188350 Gatchina, Leningrad District, Russia;(2) Scientific Research Institute of Mathematics and Mechanics, St. Petersburg State University, 198904 Petrodvorets, Russia |
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| Abstract: | The paper reports measurements of the strains and electrical resistance of a TiNi shape-memory alloy under irradiation in the low-temperature helium circuit of a nuclear reactor. Irradiation of the alloy in martensitic state at 170 K revealed that the transition temperatures from cubic to rhombohedral and from rhombohedral to monoclinic phase decrease exponentially with increasing dose. No change in the shape-memory effects and transformation plasticity was observed up to a dose of 6.7×1022 n/m2. Keeping the sample at 340 K without irradiation restores (increases) partially the transition temperatures. The relations observed can be assigned to a change in the degree of long-range order in the lattice caused by neutron irradiation. Fiz. Tverd. Tela (St. Petersburg) 40, 1705–1709 (September 1998) |
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