Grain refinement in beta-solidifying Ti44Al8Nb1B

D. Hu, C. Yang, A. Huang, M. Dixon, U. Hecht

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Abstract

Grain refinement in Ti44Al8Nb1B was studied using directional solidification technique and SEM EBSD analysis. Grain refinement occurred during beta-to-alpha transformation through boride assisted alpha nucleation mechanism rather than during solidification. Burgers and non-Burgers alpha2 grain coexisted and they were inoculated by boride precipitates. The orientation relationship between alpha and the B27 TiB precipitates is <1120> α2//[010] B27 and (0001) α2//(001) B27. The Burgers alpha variants were inoculated by the boride precipitates having an OR with beta phase and the OR was deduced as (001) TiB//{110} β, (010) TiB//{111} β and (100) TiB//{211} β.

Original languageEnglish
Pages (from-to)49-56
Number of pages8
JournalIntermetallics
Volume23
DOIs
Publication statusPublished - Apr 2012
Externally publishedYes

Keywords

  • A. Titanium aluminides, based on TiAl
  • B. Phase identification
  • B. Phase transformation
  • C. Crystal growth
  • D. Microstructure

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