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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Jie Ding
  • Shuntian Huang
  • Zhili Dong
  • Junpin Lin
  • Xiaodong Wu
  • Hui Chang

Detail(s)

Original languageEnglish
Article number2001337
Journal / PublicationAdvanced Engineering Materials
Volume23
Issue number9
Online published23 Jun 2021
Publication statusPublished - Sep 2021
Externally publishedYes

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.

Research Area(s)

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

Citation Format(s)

Thermal Stability and Lattice Strain Evolution of High-Nb-Containing TiAl Alloy under Low-Cycle-Fatigue Loading. / Ding, Jie; Huang, Shuntian; Dong, Zhili; Lin, Junpin; Ren, Yang; Wu, Xiaodong; Chang, Hui.

In: Advanced Engineering Materials, Vol. 23, No. 9, 2001337, 09.2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review