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- W2022918809 abstract "Abstract The effect of Ni additive on recrystallization and grain growth in W wires has been investigated in order to explain the role of nickel in the activated sintering of tungsten, because the two phenomena are comparable with each other, being principally diffusion controlled and greatly influenced by the presence of Ni. The experiment was carried out in a bundle model of W wires in which the initial state of nickel could be appropriately controlled by arranging Ni-coated W wires together with non-coated wires. The recrystallization and grain growth processes were observed and analysed on the basis of the geometrical relation between the Ni source and the W wires. The development of the recrystallization front depends on the Ni diffusion path and rate. Nickel diffuses fast into the W wires through high diffusivity paths such as the surface and grain boundaries, inducing recrystallization at relatively low temperature. The apparent diffusivity of Ni in W wire, estimated by measuring the migration rate of the recrystallization front, is about 1.7 × 10 −9 cm 2 s −1 , while the surface diffusivity of Ni on W is estimated to be about 10 −5 cm 2 s −1 . The role of Ni in W is further discussed." @default.
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- W2022918809 date "1993-11-01" @default.
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- W2022918809 title "Nickel-enhanced grain growth in tungsten wire" @default.
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- W2022918809 doi "https://doi.org/10.1016/0925-8388(93)90873-l" @default.
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