Nanometer-scaled lamellar microstructures in Ti-45Al-7.5Nb-(0; 0.5)C alloys and their influence on hardness

Limei Cha*, Christina Scheu, Helmut Clemens, Harald F. Chladil, Gerhard Dehm, Rainer Gerling, Arno Bartels

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

In this study, nanometer-scaled lamellar microstructures were adjusted in Ti-45Al-7.5Nb-(0; 0.5C) alloys (in at.%) and analyzed by means of transmission electron microscopy. Different annealing temperatures subsequent to quenching were used to obtain well-defined lamellar microstructures with ultrafine widths of a few tens of nanometers to a few nanometers. Surprisingly, the hardness of these alloys is enhanced by increasing the volume fraction of γ-TiAl laths. This behavior is different from the results reported in literature and can be explained by the occurrence of a size effect. The nanometer-size γ laths became harder than the α2-Ti3Al laths which are 10 times wider.

Original languageEnglish
Pages (from-to)868-875
Number of pages8
JournalIntermetallics
Volume16
Issue number7
DOIs
StatePublished - Jul 2008
Externally publishedYes

Keywords

  • A. Titanium aluminides, based on TiAl
  • B. Solid-solution hardening
  • C. Heat treatment
  • D. Microstructure
  • F. Electron microscopy, transmission

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