Grain refinement in cast Ti-46Al-8Nb and Ti-46Al-8Ta alloys via massive transformation

V. Imayev, T. Khismatullin, T. Oleneva, R. Imayev, R. Valiev, R. Wunderlich, A. Minkow, U. Hecht, H. -J. Fecht

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Some of the advantages and disadvantages of massive transformation, which has emerged as a grain refinement technique for cast Ti-46Al-8Nb and Ti-46Al-8Ta alloys, are discussed. The most significant advantages of the treatment technique, include its simplicity and exclusion of boron as a refining agent. It is expected that the second advantage can be beneficial for ductility, considering that coarse borides reduce the tensile ductility in cast TiAl alloys. The main problem faced in developing the massive transformation, as a useful processing technique for TiAl alloys, relates to the fact that high and narrow cooling rates windows are required for the massive transformation. It is found that high cooling rates can lead to crack formation, while being difficult to achieve in thick sections. Another problem associated with the technique is, the need to gather information about the temperature range at which these alloys transform into a convoluted structure.

Original languageEnglish
Pages (from-to)1095-1100
Number of pages6
JournalAdvanced Engineering Materials
Volume10
Issue number12
DOIs
Publication statusPublished - Dec 2008
Externally publishedYes

Keywords

  • grain refinement
  • alloys
  • coarse grained structures

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