Grain refinement in small-size ingots of intermetallic alloys Ti-46Al-8Nb and Ti-46Al-8Ta with the use of a massive transformation

V. M. Imayev, T. I. Oleneva, T. G. Khismatullin, R. M. Imayev, R. Valiev, H. J. Fecht

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

An estimation of the efficiency of the refinement of colonies/grains of the as-cast structure of ingots of size φ13 × 150 mm in the Ti-46Al-8Nb and Ti-46Al-8Ta (at %) alloys with the aid of a heat treatment including massive transformation has been performed. It is shown that the initial coarse-grained as-cast structure of these alloys can be refined using massive transformation without the use of a labor-consuming procedure of hot working. The method proposed is efficient for the alloys containing alloying elements that retard diffusion in the alloys, which makes it possible to obtain massive γm phase at moderate cooling rates. It is shown by X-ray diffraction that the massive ?m phase is characterized by a reduced parameter of tetragonality, which can be restored via subsequent high-temperature aging. 

Original languageEnglish
Pages (from-to)369-375
Number of pages7
JournalPhysics of Metals and Metallography
Volume109
Issue number4
DOIs
Publication statusPublished - Apr 2010
Externally publishedYes

Keywords

  • Gamma titanium aluminides
  • grain refinement
  • massive transformation

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