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- W4324045262 abstract "Undeformed tungsten suffers from a brittleness that makes it unsuitable for applications at low temperatures. Cold-worked tungsten materials such as drawn wires or rolled plates can however show considerable ductility even at low temperatures. The reason for this behaviour is so far not understood. We investigated a series of potassium-doped tungsten wires that were subsequently drawn from one sintered ingot, making them chemically identical. Hence, the properties of the wires could be studied without the influence of different impurity levels. Using transient mechanical tests, namely repeated stress relaxation experiments and strain-rate jump tests, the effective activation volumes Veff and strain-rate sensitivities m of the wires were determined at room-temperature. Based on the obtained results, it is deduced that the motion of (a0/2)⟨111⟩ screw dislocations by formation and dissociation of kink-pairs is controlling the rate of plastic deformation in all wires that show plasticity at room temperature. It is hence concluded that the ductility of drawn tungsten wires at low temperatures is not due to a change in the rate-controlling deformation mechanisms, but should be a consequence of the microstructural and textural changes during wire drawing." @default.
- W4324045262 created "2023-03-14" @default.
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- W4324045262 date "2023-03-13" @default.
- W4324045262 modified "2023-10-14" @default.
- W4324045262 title "Rate-controlling deformation mechanisms in drawn tungsten wires" @default.
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- W4324045262 doi "https://doi.org/10.1080/14786435.2023.2184877" @default.
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