Abstract
Tungsten fiber-reinforced tungsten composites are considered as plasma-facing material in future fusion reactors. Such composites are obtained by chemical vapor deposition of tungsten on potassium-doped, drawn tungsten wires. In model composites containing single fibers, particular texture types develop due to the cylindrical geometry of the deposition process. The vapor-deposited tungsten layers form a cyclic <100> ring fiber texture with one of the <100> directions pointing radially along the growth direction. The procedure for revealing this non-standard texture type from orientation data obtained by electron backscatter diffraction is presented. Identification of cyclic textures requires carefully chosen acquisition regions as well as a suitable coordinate system for their analysis. It is demonstrated that quite erroneous conclusions about the texture of the layer would be drawn if this is not accounted for properly.
Highlights
Tungsten is considered for plasma-facing components in future fusion reactors as armor material for the first wall and the divertor
The microstructure of a model composite containing a single potassium-doped tungsten fiber is investigated by means of electron backscatter diffraction [3]
For the square region in figure 6b, 100 poles are observed under 45° with respect to x- and y-direction implying preferred orientations belonging to a {100} texture component; for the rotated square region, 100 poles along both x- and y-direction are dominating implying the presence of an ideal {100} cube component; for the horizontal rectangle, 100 poles appear along the x-direction and an additional ring in the yz-plane implying a fiber texture along the x-axis
Summary
Tungsten is considered for plasma-facing components in future fusion reactors as armor material for the first wall and the divertor. Tungsten fiber-reinforced tungsten composites have achieved certain interest due to their pseudo-ductile behavior [1]. Such composites can be obtained by chemical vapor deposition of tungsten on drawn tungsten wires [2]. The microstructure of a model composite containing a single potassium-doped tungsten fiber is investigated by means of electron backscatter diffraction [3]. Focus is on revealing the particular texture caused by deposition geometry
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
