Abstract
A Ti-47 at.% Al intermetallic alloy and three TiAl alloys containing ∼2.0 at.% Mn and/or ∼0.4 at.% Si were prepared by powder metallurgical processing. When the samples were irradiated with He-ions to 3 dpa at 773 K, formation of defect clusters and cavities in TiAl alloys were remarkably suppressed by the addition of Mn. In Mn-added TiAl, although no loops, which were observed in pure TiAl and Si-added samples, were formed, the defect clusters with large strain field were found. It was suggested that the defect clusters were formed by the migration of mixed dumbbell type Mn atom-interstitials. The addition of Si showed no beneficial effects on suppression of radiation damage in TiAl alloys.
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