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

Abstract

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: Δεt/2 = ±0.25%, Δεt/2 = ±0.28%, and Δεt/2 = ±0.30%. At early deformation stages, α2lamellae 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 ωo area. In addition, according to the peak intensity and peak broadening results, the ωo → B2 phase transformation occurred, leading to the appearance of single B2-phase areas. The lattice strains in the ωo 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, thismore » study provides a better understanding of the low cycle fatigue deformation of TiAl alloys.« less

Authors:
 [1];  [1];  [1];  [1];  [2];  [3];  [1]
  1. Univ. of Science and Technology Beijing (USTB) (China). State Key Lab. for Advanced Metals and Materials
  2. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division. Advanced Photon Source
  3. Beijing Inst. of Aeronautical Materials (China). National Key Lab. of Science and Technology on Advanced High Temperature Structural Materials
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Science and Technology Beijing (USTB) (China)
Sponsoring Org.:
USDOE; National Natural Science Foundation of China (NSFC); National Science Foundation for Distinguished Young Scholars (China)
OSTI Identifier:
1461317
Alternate Identifier(s):
OSTI ID: 1548983
Grant/Contract Number:  
AC02-06CH11357; 51671016; 51401195
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 145; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; high Nb-containing TiAl alloys; low cycle fatigue; high-energy X-ray diffraction; phase transformation

Citation Formats

Ding, Jie, Zhang, Minghe, Ye, Teng, Liang, Yongfeng, Ren, Yang, Dong, Chengli, and Lin, Junpin. Microstructure stability and micro-mechanical behavior of as-cast gamma-TiAl alloy during high-temperature low cycle fatigue. United States: N. p., 2017. Web. doi:10.1016/j.actamat.2017.12.040.
Ding, Jie, Zhang, Minghe, Ye, Teng, Liang, Yongfeng, Ren, Yang, Dong, Chengli, & Lin, Junpin. Microstructure stability and micro-mechanical behavior of as-cast gamma-TiAl alloy during high-temperature low cycle fatigue. United States. https://doi.org/10.1016/j.actamat.2017.12.040
Ding, Jie, Zhang, Minghe, Ye, Teng, Liang, Yongfeng, Ren, Yang, Dong, Chengli, and Lin, Junpin. Mon . "Microstructure stability and micro-mechanical behavior of as-cast gamma-TiAl alloy during high-temperature low cycle fatigue". United States. https://doi.org/10.1016/j.actamat.2017.12.040. https://www.osti.gov/servlets/purl/1461317.
@article{osti_1461317,
title = {Microstructure stability and micro-mechanical behavior of as-cast gamma-TiAl alloy during high-temperature low cycle fatigue},
author = {Ding, Jie and Zhang, Minghe and Ye, Teng and Liang, Yongfeng and Ren, Yang and Dong, Chengli and Lin, Junpin},
abstractNote = {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: Δεt/2 = ±0.25%, Δεt/2 = ±0.28%, and Δεt/2 = ±0.30%. At early deformation stages, α2lamellae 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 ωo area. In addition, according to the peak intensity and peak broadening results, the ωo → B2 phase transformation occurred, leading to the appearance of single B2-phase areas. The lattice strains in the ωo 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.},
doi = {10.1016/j.actamat.2017.12.040},
journal = {Acta Materialia},
number = ,
volume = 145,
place = {United States},
year = {Mon Dec 18 00:00:00 EST 2017},
month = {Mon Dec 18 00:00:00 EST 2017}
}

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Cited by: 38 works
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Works referenced in this record:

High-temperature structural intermetallics
journal, January 2000


Pore structures and thermal insulating properties of high Nb containing TiAl porous alloys
journal, March 2010


On the origin of superior high strength of Ti–45Al–10Nb alloys
journal, May 2002


Investigations of hydrogen-promoted α2-lamella decomposition of a γ-TiAl based alloy
journal, August 2015


Thermomechanical fatigue behaviours of a third generation γ-TiAl based alloy
journal, May 2007


A novel method for grain refinement and microstructure modification in TiAl alloy by ultrasonic vibration
journal, January 2016


Monotonic and Cyclic Properties of TiAl Alloys Doped with Nb, Mo and C
journal, January 2014


The enhancement of low cycle fatigue life by carbon addition in lamellar TiAl alloy
journal, October 2002


Microstructure–low cycle fatigue behaviour relationships in a PM γ-TiAl alloy
journal, October 2006


Effect of lamellar spacing on fatigue crack growth behaviour of a TiAl-based aluminide with lamellar microstructure
journal, January 2012


Impact of microstructure, temperature and strain ratio on energy-based low-cycle fatigue life prediction models for TiAl alloys
journal, July 2010


Effect of dwell time on creep-fatigue life of a high-Nb TiAl alloy at 750°C
journal, December 2015


Effect of stress ratio on fatigue crack growth in TiAl intermetallics at room and elevated temperatures
journal, October 2000


The role of competing mechanisms in the fatigue life variability of a nearly fully-lamellar ?-TiAl based alloy
journal, March 2005


Microstructural stability of lamellar TiAl-based alloys at high temperature
journal, November 1999


Electron microscope characterization of low cycle fatigue in a high-strength multiphase titanium aluminide alloy
journal, May 2010


Intragranular nucleation sites of massive γ grains in a TiAl-based alloy
journal, August 2007


Effects of B and W alloying additions on the formation and stability of lamellar structures in two-phase γ-TiAl
journal, January 1997


Ordered α2 to ωo phase transformations in high Nb-containing TiAl alloys
journal, June 2015


Ordered ω phases in a 4Zr–4Nb-containing TiAl-based alloy
journal, May 2008


Omega phase in as-cast high-Nb-containing TiAl alloy
journal, June 2013


Evolution of the ωo phase in a β-stabilized multi-phase TiAl alloy and its effect on hardness
journal, February 2014


Phase transformation and decomposition mechanisms of the β (ω) phase in cast high Nb containing TiAl alloy
journal, December 2014


Microsegregation in high Nb containing TiAl alloy ingots beyond laboratory scale
journal, May 2007


On the microsegregation of Ti–45Al–(8–9)Nb–(W, B, Y) alloy
journal, January 2007


Thermal exposure induced α2+γ→B2(ω) and α2→B2(ω) phase transformations in a high Nb fully lamellar TiAl alloy
journal, January 2003


Evolution of microstructure and texture in Ti–46Al–9Nb sheet material during tensile flow at elevated temperatures
journal, May 2010


Ordered ω phase transformations in Ti-45Al-8.5Nb-0.2B alloy
journal, October 2015


Precipitation behavior of the ωo phase in an annealed high Nb-TiAl alloy
journal, April 2017


Cyclic deformation and microstructure evolution of high Nb containing TiAl alloy during high temperature low cycle fatigue
journal, June 2017


Dynamic elastic moduli of the titanium aluminides
journal, June 1977

  • Schafrik, Robert E.
  • Metallurgical Transactions A, Vol. 8, Issue 6
  • DOI: 10.1007/BF02661586

The effect of processing on the elastic moduli of porous γ-TiAl
journal, August 2003


Microstructures and Elastic Moduli of Binary Titanium Alloys Containing Biocompatible Alloying Elements
journal, January 2005


Effect of internal stresses on the fracture toughness of a TiAl-based alloy with duplex microstructures
journal, October 2003


A study of mechanical properties and microscopic stress of a two-phase TiAl-based intermetallic alloy
journal, September 2001


X-ray elastic constant determination and microstresses of α2 phase of a two-phase TiAl-based intermetallic alloy
journal, January 2003


Precipitation behaviors in a quenched high Nb-containing TiAl alloy during annealing
journal, October 2017


Silicon distribution and silicide precipitation during annealing in an advanced multi-phase γ-TiAl based alloy
journal, May 2016


Works referencing / citing this record:

Oxidation Behavior of a High-Nb-Containing TiAl Alloy with Multilayered Thermal Barrier Coatings
journal, July 2018


Improvement of high-temperature oxidation resistance of γ -TiAl intermetallic alloy by YSZ-NiCoCrAlY coating using APS process
journal, November 2019


Microstructure Evolution and Mechanical Properties of PM-Ti43Al9V0.3Y Alloy
journal, January 2020

  • Zhang, Dongdong; Liu, Na; Chen, Yuyong
  • Materials, Vol. 13, Issue 1
  • DOI: 10.3390/ma13010198

Study on the oxidation resistance of γ -TiAl intermetallic alloy coated via different diffusion coating processes
journal, August 2019


Microstructure Evolution and Mechanical Properties of PM-Ti43Al9V0.3Y Alloy
journal, January 2020

  • Zhang, Dongdong; Liu, Na; Chen, Yuyong
  • Materials, Vol. 13, Issue 1
  • DOI: 10.3390/ma13010198