Abstract
The behavior of Ti-rich MC-type precipitates in the Japanese prime-candidate-alloy (JPCA) during irradiation in HFIR to 58 dpa at 300°C is described. Fine MC precipitates formed after irradiation to 34 dpa. The number density of MC particles decreased, however, as irradiation continued to 68 dpa. Chemical composition of the radiation produced MC phase particles was strongly dependent on precipitate size. MC precipitates produced by thermal aging prior to irradiation also showed the same size-dependent composition after irradiation. The relation between the size-dependent composition and the stability of the MC phase particles is discussed.
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