Microstructure stability and micro-mechanical behavior of as-cast gamma-TiAl alloy during high-temperature low cycle fatigue

Ding, Jie; Zhang, Minghe; Ye, Teng; Liang, Yongfeng; Ren, Yang; Dong, Chengli; Lin, Junpin

doi:10.1016/j.actamat.2017.12.040

Title: Microstructure stability and micro-mechanical behavior of as-cast gamma-TiAl alloy during high-temperature low cycle fatigue

Journal Article · Mon Dec 18 00:00:00 EST 2017 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2017.12.040· OSTI ID:1461317

Ding, Jie ^[1]; Zhang, Minghe ^[1]; Ye, Teng ^[1]; Liang, Yongfeng ^[1]; Ren, Yang ^[2]; Dong, Chengli ^[3]; Lin, Junpin ^[1]

Univ. of Science and Technology Beijing (USTB) (China). State Key Lab. for Advanced Metals and Materials
Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division. Advanced Photon Source
Beijing Inst. of Aeronautical Materials (China). National Key Lab. of Science and Technology on Advanced High Temperature Structural Materials

This paper systematically investigated the low cycle fatigue deformation of a high Nb-containing TiAl alloy with a nominal chemical composition of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y at 850 °C by using transmission electron microscopy (TEM), scanning electron microscopy (SEM), and synchrotron-based high-energy X-ray diffraction (HE-XRD) techniques. Cyclic stress-strain (CSS) behavior, lattice strain, and peak broadening of {100}_α2, {201}_γ, and {202}_ωo planes, phase transformations, and crack propagation behavior were obtained for samples with three total strain amplitudes: Δε_t/2 = ±0.25%, Δε_t/2 = ±0.28%, and Δε_t/2 = ±0.30%. At early deformation stages, α_2lamellae transformed into ωo phase with a distinct orientation relationship, and a certain orientation relationship (OR) between them was observed after the following cyclic deformation. Furthermore, γ particles precipitated within the single ω_o area. In addition, according to the peak intensity and peak broadening results, the ω_o → B2 phase transformation occurred, leading to the appearance of single B2-phase areas. The lattice strains in the ω_o phase were always in tension during the cyclic deformation and large differences of the lattice strains were found in the γ phase and α₂ phase, not only the values but also the directions, which resulted in crack nucleated at and propagated along the α₂/γ lamellar interface. Finally, this study provides a better understanding of the low cycle fatigue deformation of TiAl alloys.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Science and Technology Beijing (USTB) (China)

Sponsoring Organization:: USDOE; National Natural Science Foundation of China (NSFC); National Science Foundation for Distinguished Young Scholars (China)

Grant/Contract Number:: AC02-06CH11357; 51671016; 51401195

OSTI ID:: 1461317

Alternate ID(s):: OSTI ID: 1548983

Journal Information:: Acta Materialia, Vol. 145; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 38 works

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Title: Microstructure stability and micro-mechanical behavior of as-cast gamma-TiAl alloy during high-temperature low cycle fatigue

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