Effect of stress ratio on high cycle fatigue behavior of TNM‐TiAl alloy

Sun, Guanze; Cao, Rui; Zhou, Xin; Jiang, Xiao Xia; Wang, Hongwei

doi:10.1111/ffe.13835

Cited by 4 publications

(3 citation statements)

References 26 publications

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“…13 Moreover, with the increase of stress ratio, the lamellar structure in a TiAl alloy elongates along the axial direction. 14 However, the conventional models fail to consider the effects of stress ratios and other loading conditions on materials.…”

Section: Introductionmentioning

confidence: 99%

“…However, crack initiations mainly occur in the interior aluminates under uniaxial loading at a higher number of cycles to failure 13 . Moreover, with the increase of stress ratio, the lamellar structure in a TiAl alloy elongates along the axial direction 14 . However, the conventional models fail to consider the effects of stress ratios and other loading conditions on materials.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A new method for predicting the fatigue strength at various stress ratios based on damage of metallic materials

Gao,

Pang,

et al. 2024

Fatigue Fract Eng Mat Struct

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The prediction of fatigue strength for metallic materials in a wide range of stress ratios is a crucial engineering challenge. To pursue a more accurate method, the dependence of fatigue strength on stress ratio for 35CrMo steel and other materials was investigated in detail. It was found that as the stress ratio increases, the damage mechanism changes, and the errors of the conventional models in predicting the fatigue strength increase. The reason is that those models fail to describe the fatigue damage evolution of metallic materials under some special conditions. Based on the variational fatigue damage, a new prediction method was proposed by introducing the damage parameter. Through the validation with fatigue strength covering a variety of metallic materials and loading conditions, the method exhibits higher universality. And then the corresponding parameter of the formula is further analyzed to elucidate the influences of various loading conditions on fatigue damage of materials.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A new method for predicting the fatigue strength at various stress ratios based on damage of metallic materials

Gao,

Pang,

et al. 2024

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…In fatigue and creep experiments of the TiAl alloys below the T eu , the pressure can significantly accelerate the service decomposition of the α 2 phase. The α 2 → γ phase transformation occurs in traditional the TiAl alloys in different service conditions, but the morphological and orientation relationship characteristics of these phase transformations are considerably different in different modes [ 27 , 28 , 29 , 30 ]. There are few studies on the microstructure instability and phase transformation of the TiAl alloy with high-stress stored energy at service temperature.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution of the Ti-46Al-8Nb-2.5V Alloy during Hot Compression and Subsequent Annealing at 900 °C

Cao,

Li,

et al. 2023

Materials

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TiAl alloys are high-temperature structural materials with excellent comprehensive properties, and their ideal service temperature range is about 700–950 °C. High-Nb containing the Ti-46Al-8Nb-2.5V alloy was subjected to hot compression and subsequent annealing at 900 °C. During hot compression, work-hardening and strain-softening occurred. The peak stresses during compression are positively correlated with the compressive strain rates and negatively correlated with the compression temperatures. The α2 phase exhibited a typical (0001)α2 basal plane texture after hot compression, while the β0 and γ phases did not show a typical strong texture. Subsequent annealing at 900 °C of the hot-compressed samples resulted in significant phase transformations, specifically the α2 → γ and β0 → γ phase transformations. After 30 min of annealing, the volume fraction of the α2 phase decreased from 39.0% to 4.6%. The microstructure characteristics and phase fraction after 60 min of annealing were similar to those after 30 min. According to the calculation of Miller indexes and texture evolution during annealing, the α2 → γ phase transformation did not follow the Blackburn orientation relationship. Multiple crystal-oriented α2 phases with nanoscale widths (20~100 nm) precipitate within the γ phase during the annealing process, which means the occurrence of γ → α2 phase transformation. Still, the γ → α2 phase transformation follows the Blackburn orientation relationship.

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Advanced TiAl Based Alloys: From Polycrystals to Polysynthetic Twinned Single Crystals

Zhao,

Chu,

et al. 2024

Adv Funct Materials

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TiAl alloys stand out for low density, high specific strength, and excellent creep resistance, making them promising for high‐temperature aerospace applications. However, traditional TiAl alloys suffer from poor room‐temperature ductility and low service temperature that limit their critical applications in aerospace structures. To address these issues, research has focused on improving the mechanical properties of TiAl alloys through alloying and microstructural design. After decades of effort, the evolution of TiAl alloys has progressed from polycrystalline TiAl to high‐performance polysynthetic twinned (PST) TiAl single crystals. The well‐aligned PST TiAl single crystals enriched with Nb enable an excellent combination of strength and ductility, significantly outperforming polycrystalline TiAl alloys. This review summarizes recent progress on TiAl alloys, particularly focusing on newly developed PST single crystals. First, the development history of TiAl alloys is overviewed; then their crystal structures, phase diagrams, and typical microstructures are systematically discussed, along with the design strategies based on alloying elements. Additionally, recent advances in TiAl columnar crystals, which are between polycrystals and single crystals, are reviewed. Subsequently, the mechanical anisotropy, preparation methods, and superior mechanical properties of the PST single crystals are analyzed in detail. The final remark highlights the future development and application prospects of TiAl alloys.

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Effect of stress ratio on high cycle fatigue behavior of TNM‐TiAl alloy

Cited by 4 publications

References 26 publications

A new method for predicting the fatigue strength at various stress ratios based on damage of metallic materials

A new method for predicting the fatigue strength at various stress ratios based on damage of metallic materials

Microstructure Evolution of the Ti-46Al-8Nb-2.5V Alloy during Hot Compression and Subsequent Annealing at 900 °C

Advanced TiAl Based Alloys: From Polycrystals to Polysynthetic Twinned Single Crystals

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