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Alignment of the lamellar orientation of multi-component TiAl alloys by directional solidification (DS) and mechanical properties of DS ingots

  • Y. Omiya (a1), S. Muto (a1), T. Yamanaka (a1), D. R. Johnson (a2), H. Inui (a1) and M. Yamaguchi (a1)...

Abstract

By using an appropriately oriented seed from the TiAl-Si system (Ti-43Al-3Si), the TiAl/Ti3Al lamellar structure has been successfully aligned parallel to the growth direction for TiAl ingots of the Ti-Al-Nb, Ti-Al-Nb-Si, Ti-Al-Ta-Si systems on the basis of the recently proposed method to predict the appropriate compositions. The Al equivalents for Nb and Ta are reevaluated in order to extend the proposed method to large addition (above a several at. %) of these alloying elements. These DS ingots with the lamellar structure all aligned parallel to the loading axis exhibit creep properties far better than conventionally produced TiAl ingots so far reported.

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Alignment of the lamellar orientation of multi-component TiAl alloys by directional solidification (DS) and mechanical properties of DS ingots

  • Y. Omiya (a1), S. Muto (a1), T. Yamanaka (a1), D. R. Johnson (a2), H. Inui (a1) and M. Yamaguchi (a1)...

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