Phase composition and defect substructure of nickel alloyed with boron and copper by electric explosion of conductors |
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Authors: | O A Tsvirkun A Ya Bagautdinov Yu F Ivanov E A Budovskikh V E Gromov |
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Institution: | (1) Siberian State University of Industry, Siberia;(2) Institute of High Current Electronics of the Siberian Branch of the Russian Academy of Sciences, Russia |
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Abstract: | Using methods of electron microscopy, we have discovered that combined electroexplosive alloying of nickel with boron and
copper gives rise to a multilayer structure. An outer amorphous crystalline layer incorporating 2–3 nm nickel-and copper-boride,
oxide, and boride-oxide crystallites is formed on the alloyed surface. The intermediate (subsurface) layer 1–2 μm thick is
made up of NiB
12 and Ni
4
B
3 crystallites 120–130 nm in size, with boron-and copper-oxide particles observed along the grain boundaries. The underlying
thick layer exhibits a cellular Ni-Cu-B melt crystallization structure grading initially into a high-rate dendritic crystallization structure and then into a granular
structure. The electroexplosive alloying process is found to bring into existence a high scalar dislocation-density substructure
in nickel crystallites both in the alloyed zone and in the adjacent heat-affected zone.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 3–7, March 2007. |
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Keywords: | |
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