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The change in the structural-phase state and microhardness of the 67CoNi5Nb alloy while ion and electron beams processing

Authors: Скаков Мажын Канапинович, Рахадилов Бауыржан Корабаевич, Зарва Денис Борисович, Гулькин Александр Владимирович

Keywords: ионная имплантация, электронно-лучевая обработка, микротвердость, сплав

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The article shows the influence of ion implantation of nitrogen and electron-beam processing on structural-phase state and microhardness of a dispersion-hardening 67CoNi5Nb alloy. It is established that at the surface treatment of electronic and ion beams is the place to morphological changes, and changes in the elemental composition of the 67CoNi5Nb alloy. It is determined that in the result of treatment by nitrogen ions and electrons on the surface of a dispersion-hardening 67CoNi5Nb alloy formed fine inclusion due to surface segregation of niobium. It is shown that the
ion implantation leads to an increase in the microhardness to 10–50%, depending from dose of irradiation. It is determined that the surface microhardness of the 67CoNi5Nb alloy after electron irradiation increases almost to 2 times.

Effect of MeV energy of crypton ions on Ni-Ti alloy hardening

Authors: Сатпаев Д.А., Полтавцева В.П., Дегтярева А.С.

Keywords: сплав, Ni-Ti

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The patterns of changes in microhardness and phase composition of Ni-Ti alloy in the martensitic-austenite state have been experimentally studied as a result of irradiation with 84Kr15+ ions with the energy of 93 and 147 MeV at the temperature of ≤ 100 °С. It was established that irrespective of the energy of 84Kr15+ ions, a complete radiationstimulated В19'→В2 transformation occurs during irradiation. It was shown that hardening of the modified layers increases with the energy of 84Kr15+ ions and it is determined by hardness of NiTi austenite phase due to formation of the hardened radiation-introduced defective structures.

Effect of the fluence of high-energy crypton ions irradiation on Ni-Ti alloy hardening

Authors: Сатпаев Д.А., Полтавцева В.П., Партыка Я.

Keywords: микротвердость, сплав, Ni-Ti

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The patterns of changes in microhardness and phase composition of Ni-Ti alloy in the austenitic structural-phase state have been experimentally studied depending on the fluence of irradiation with 84Kr15+ ions with the energy of 147 MeV. It was established that hardening with a maximum in the range of the projected range Rp and in the out-of-range region (h > Rp) increases with the growth of the irradiation fluence up to 5·1019 ion/m2 . It was shown that the reason of hardening is formation of the radiation-introduced hardened defective structures. The formation of nano-sized particles of the martensitic R-phase and the decrease in Ni-Ti phase content with the B2 structure are also characteristic in the process of irradiation up to maximum fluence due to radiation effects.