Plastic deformation of recrystallized tungsten-potassium wires: Constitutive deformation law in the temperature range 22–600 °C
(2018) International Journal of Refractory and Hard Metals — Vol. 73, p. 38-45 (2018)
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- Authors
Zinovev, Aleksandr 
Coenen, J.W.
- Abstract
- Recent efforts dedicated to the mitigation of tungsten (W) brittleness have demonstrated that tungsten fiber- reinforced composites acquire extrinsic toughening even at room temperature, which is due to the outstanding strength of W wires. However, high temperature operation/fabrication of the fiber-reinforced composite might result in the degradation of the mechanical properties ofWwires. To address this, we investigate mechanical and microstructural properties of potassium-doped tungsten wires, being heat treated at 2300 °C and tested in temperature range 22–600 °C. Based on the microscopic analysis, the engineering deformation curves are converted into actual stress - strain dataset, accounting for the local necking. The analysis demonstrates that local strain in the necking region can reach up to 50% and the total elongation monotonically increases with tem- perature, while the ultimate tensile strength goes down. Preliminary transmission electron microscopy analysis using FIB-cut lamella from the necking region revealed the presence of curved dislocation lines in the sample tested at 300 °C, proving that plastic deformation occurred by dislocation glide.
- Affiliations
Citations
Terentyev, D., Riesch, J., Lebediev, S., Khvan, T., Zinovev, A., Rasiński, M., Dubinko, A., & Coenen, J. W. (2018). Plastic deformation of recrystallized tungsten-potassium wires: Constitutive deformation law in the temperature range 22–600 °C. International Journal of Refractory and Hard Metals, 73, 38-45. https://doi.org/10.1016/j.ijrmhm.2018.01.012 (Original work published 2018)