Abstract:
The paper presents the results of studying the structure and phase state of tungsten and
tungsten-copper alloy after pulsed action of compression plasma flows and irradiation with helium
ions. The compression plasma flows were used to modify the surface layer of tungsten, as well as
to create an alloy based on tungsten and copper. Using scanning electron microscopy and X-ray
structural analysis, the formation of radiation defects on the tungsten surface was detected in the
form of local areas of exfoliation and destruction, which begin to form at helium ion irradiation
doses of 2 × 1017 cm−2
. It is shown that preliminary plasma treatment of the surface in the melting
mode leads to the complete disappearance of surface radiation defects up to a dose of 2 × 1017 cm−2
,
which may be associated with the formation of a fine-crystalline grain structure, the intergranular
boundaries of which serve as effective sinks for primary radiation defects.
