Abstract
In order to increase the maximum service temperature of intermetallic TiAl materials novel alloy and microstructure concepts are required. Thus, this study focuses on so-called σ/γ-TiAl materials alloyed with β-stabilizing elements Cr and Mo. These alloys in principle show improved mechanical capabilities, but their microstructure control necessitates judicious design of composition and heat treatment parameters. In this work the effects of the alloying elements Cr and Mo are elucidated. The presence of these elements retards the formation of γ- and σ-phases due to diffusional redistribution required, thereby, allowing for the formation of a fine-grained matrix with an embedded particle structure.
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