Abstract
From the standpoint of plasma contamination by surface erosion, in-situ composites of low Z (low atomic number) materials are thought to be probable candidates for first walls of fusion reactors. The objective of this investigation was to evaluate the potential of Mo-TIC eutectic alloy by means of heavy ion irradiation. The materials used were electron beam melted Mo-23.5 mol %. TiC eutectic alloy and arc melted TiC 0.98. Argon and helium ion irradiations were performed with a maximum energy of 400 keV and with a maximum fluence of 1.5 × 10 22 ions/m 2, at ambient temperature. In Mo-TiC eutectic alloy, reduction of grain size to the sub-micron level proved to be very effective in reducing surface erosion due to high dose irradiation with Ar + or He +. Further, a quasi-honeycomb structure with extruded TiC showed excellent resistance to radiation induced surface erosion.
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