Thermal Stability and Lattice Strain Evolution of High-Nb-Containing TiAl Alloy under Low-Cycle-Fatigue Loading

Jie Ding, Shuntian Huang, Zhili Dong, Junpin Lin, Yang Ren, Xiaodong Wu, Hui Chang

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The micromechanical behavior and the effect of temperature on the micromechanical mechanism of high-Nb-containing TiAl alloy during low-cycle fatigue still remain uncertain. Herein, in situ and ex situ synchrotron-based high-energy X-ray (HEXRD) experiment results reveal that the γ and ωo phases suffer compressive lattice strains but the lattice strain in the α2 phase evolves from tensile to compressive during low-cycle fatigue at 900 °C. In addition, the three phases suffer compressive lattice strains during cooling to room temperature, which could result in larger compressive lattice strains in γ and ωo phases and the change of the lattice strain state in the α2 phase. The peak-broadening results show γ recrystallization is dominant in the interrupted low-cycle-fatigue samples, whereas inhomogeneous deformation occurs in the failed low-cycle-fatigue samples. The performed synchrotron diffraction experiments offer a deeper insight into the phase transformations and micromechanism of TiAl alloy during low-cycle fatigue.

Original languageEnglish
Article number2001337
JournalAdvanced Engineering Materials
Volume23
Issue number9
DOIs
StatePublished - Sep 2021

Keywords

  • cyclic stress–strain behavior
  • intermetallics
  • low-cycle fatigue
  • phase transformations
  • recrystallization

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