Fatigue properties of TiAl alloys

Hénaff, Gilbert; Gloanec, Anne-Lise

doi:10.1016/j.intermet.2004.09.007

Cited by 96 publications

(64 citation statements)

References 54 publications

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“…The effect of temperature on the fatigue threshold properties of γ -TiAl alloys has been reviewed extensively elsewhere [8,9]; however, little further progress has been made since towards understanding the effect of temperature on the micromechanisms of fatigue crack initiation and growth [28,[55][56][57][58][59][60]. The effect of temperature appears to be complex.…”

Section: Effect Of Temperature and Environmentmentioning

confidence: 99%

“…Similarly, an increased consideration of the complex HCF loading conditions that the component must withstand is required to optimise the texture of γ -TiAl alloy microstructures this top-tobottom approach has been reviewed recently [7]. Several reviews of the fatigue properties of γ -TiAl alloys exist [8,9]. However, most of the understanding of FCG is focussed on plasticity in the bulk and at crack tips during LCF; HCF is treated using conventional approaches to fatigue life evaluation [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Recent progress in the high-cycle fatigue behaviour of γ-TiAl alloys

Edwards

2018

Materials Science and Technology

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The high-cycle fatigue (HCF) properties of γ -TiAl (gamma titanium aluminide) alloys are reviewed, particularly with regards to the deformation mechanisms active in the near-threshold cyclic loading regime. By examining the influence of lamellar orientation and thickness on the HCF threshold, in addition to more conventional microstructural considerations such as the grain size or the volume fraction of lamellar colonies, factors to improve the γ -TiAl microstructure for HCF are assessed. Finally, experimental methods and loading strategies are surveyed to identify techniques for improving HCF testing of γ -TiAl alloys. In this, we consider both the conservativism of differing approaches and the possibility to measure with suitable resolution the local mechanical behaviour under HCF of the lamellar γ -TiAl microstructure. ARTICLE HISTORY

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Section: Effect Of Temperature and Environmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recent progress in the high-cycle fatigue behaviour of γ-TiAl alloys

Edwards

2018

Materials Science and Technology

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“…Intensive TEM investigations of microstructures after cyclic loading up to high temperatures (973 K) revealed that the deformation behaviour of two-phase γ-TiAl alloys is determined by the easy activation of regular dislocation glide and mechanical twinning [75]. Furthermore, Henaff and Gloanec [76] observed recovery and climb processes as well as remnant dislocation loops in an ordinary dislocation arrangement after LCF tests at 723 K. In comparison to TEM investigations, ECCI studies on bulk specimens allow to investigate the dislocation arrangements with a reasonable good statistic without demanding and time consuming preparation of thin foils. Details on the investigated material and the thermo-mechanical fatigue tests are presented in [77,78].…”

Section: Observation Of Individual Dislocations By Hr-eccimentioning

confidence: 99%

Case studies on the application of high-resolution electron channelling contrast imaging – investigation of defects and defect arrangements in metallic materials

Weidner

Biermann

2015

Philosophical Magazine

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In 1967, Coates discovered the electron channelling contrast of backscattered electrons (BSEs) in scanning electron microscopy, and by this the possibility to investigate arrangements of lattice defects in deformed microstructures of materials. Since that time, a straightforward development of the scanning electron microscopes as well as of the electron channelling contrast technique took place. Nowadays, the performance of scanning electron microscopes is high enough that the resolution of electron channelling contrast imaging (ECCI) micrographs is comparable with conventional bright field transmission electron microscopy (TEM) micrographs. In the first part of the present paper, a historical review on the development of the ECCI technique starting from its discovery more than 45 years ago up to the combination with other advanced methods of scanning electron microscopy like electron backscatter diffraction or high-resolution selected area channelling patterning in the last few years is given. Major important investigations using this technique for the visualization of individual lattice defects like stacking faults (SFs) and dislocations or dislocation arrangements are chronologically summarized. The second part demonstrates that nowadays, ECCI micrographs taken in high-resolution scanning electron microscopes can be called high-resolution ECCI (HR-ECCI). It is shown that the resolution of individual SFs and dislocations in the HR-ECCI micrographs is comparable to that of conventional TEM (about 15 nm defect image width). Furthermore, the paper is demonstrating that HR-ECCI micrographs can be obtained for various types of materials after different mechanical loadings and different grain sizes ranging from large grain size of 500 μm (cast steel) down to less than 2 μm (γ-TiAl).

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“…Special attention is paid to establishing the influence of surface treatment methods on high-cycle and low-cycle fatigue [13]. For example, the authors of [14] proposed the use of surface rolling by steel rollers and shot blasting to increase the fatigue characteristics of Ti-6 at.…”

Section: Research Of Existing Solutions Of the Problemmentioning

confidence: 99%