Lamellae Orientation Control and Mechanical Properties of Directionally Solidified Binary Ti-49Al Alloy in Oxide Ceramics Crucible

Fan, Jiangkun; Wei, Zexin; Liu, Ying; Wang, Yan; Wu, Shen; Zhou, Xiangkui; Liu, Jianxiu; Guo, Jingjie

doi:10.1007/s40962-021-00614-7

Cited by 8 publications

(5 citation statements)

References 46 publications

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“…However, at high growth rates, some grains nucleated at the inner wall of the mold and grew poorly oriented grains, which hindered the growth of grains with parallel orientation. Fan et al [16] also studied the preparation of directionally solidified Ti-49Al alloy self-seeding. Other alloys that can adopt self-seeding include Ti-50Al-4Nb [18] since Al-equivalent of composition is similar to Ti-49Al.…”

Section: Self-seeding Methodsmentioning

confidence: 99%

“…Fan et al [ 16 ] also studied the preparation of directionally solidified Ti-49Al alloy by self-seeding. Other alloys that can adopt self-seeding include Ti-50Al-4Nb [ 18 ] since the Al-equivalent of composition is similar to Ti-49Al.…”

Section: Seed Crystal Methods and Principlesmentioning

confidence: 99%

“…The solidification modes of multi-component TiAl alloys are not clear yet, bringing difficulties in obtaining single crystal or columnar crystals with consistent lamellar orientation. Furthermore, the application range of traditional α phase seeds remains relatively limited; the quasi-seed method [ 14 , 15 ] and the self-seeding method [ 16 , 17 , 18 ] require specific master alloy compositions.…”

Section: Difficulties and Critical Problems In Lamellar Orientation C...mentioning

confidence: 99%

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Review on Progress of Lamellar Orientation Control in Directionally Solidified TiAl Alloys

et al. 2023

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TiAl alloys have excellent high-temperature performance and are potentially used in the aerospace industry. By controlling the lamellar orientation through directional solidification (DS) technology, the plasticity and strength of TiAl alloy at room temperature and high temperatures can be effectively improved. However, various difficulties lie in ensuring the lamellar orientation is parallel to the growth direction. This paper reviews two fundamental thoughts for lamellar orientation control: using seed crystals and controlling the solidification path. Multiple specific methods and their progress are introduced, including α seed crystal method, the self-seeding method, the double DS self-seeding method, the quasi-seeding method, the pure metal seeding method, and controlling solidification parameters. The advantages and disadvantages of different methods are analyzed. This paper also introduces novel ways of controlling the lamellar orientation and discusses future development.

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Section: Self-seeding Methodsmentioning

confidence: 99%

Section: Seed Crystal Methods and Principlesmentioning

confidence: 99%

Section: Difficulties and Critical Problems In Lamellar Orientation C...mentioning

confidence: 99%

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Review on Progress of Lamellar Orientation Control in Directionally Solidified TiAl Alloys

et al. 2023

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“…In spite of the aforementioned findings that highlight the influence of lamellar orientation on fatigue behavior, research on the combined effect of microdefects and surrounding lamellar orientation of grains is rather surprising. It shall be also pointed out that research on lamellar orientation control is mostly focused on experimental material processing, 33,34 and the experimental cost of the details of lamellar orientation control cannot be ignored. Conversely, numerical modeling provides an alternative approach to tuning lamellar orientation in bimodal titanium alloys, offering a variety of options for advanced material design.…”

Section: Introductionmentioning

confidence: 99%

Crystal plasticity modeling fatigue behavior in bimodal Ti–6Al–4V: Effects of microdefect and lamellar orientation

Zhao,

Tang,

Ferro

et al. 2024

Fatigue Fract Eng Mat Struct

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Investigating fatigue failure in titanium alloys is crucial for material design and engineering. Fatigue behavior in dual‐phase titanium alloys is strongly correlated with microstructural features and microdefects. This work formulates an improved modeling method to investigate fatigue behavior of bimodal Ti–6Al–4V, emphasizing the effects of lamellar orientation and microdefects. Using an improved Voronoi tessellation method, we establish representative volume element (RVE) models with various grain size distributions. Crystal plasticity finite element modeling (CPFEM) is used to analyze fatigue deformation in bimodal Ti–6Al–4V, considering microdefects and lamellar orientation. Fatigue indicator parameters are then incorporated into CPFEM to predict fatigue life and verified with experimental data. Numerical results highlight the significant influence of lamellar orientation and microdefects on fatigue behavior, with predicted life within the 3‐error band. This method efficiently overcomes challenges in quantitatively characterizing microstructural lamellae that experiments are short of, paving the way for designing fatigue‐resistant alloy materials with similar microstructures.

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“…If the alloy is characterized by a mixture of lamellar colonies and c grains, then the resulting alloy is an interesting structural material having mechanical properties that are sensitive to microstructure, grain size and micro-alloying. Many efforts have also been devoted to improve mechanical properties of TiAl-based alloys by controlling the lamellar orientation by the seeding technology 11 Studies and simulations have been carried out to limit residual stresses, which are very critical for these alloys, and to avoid the formation of defects such as shrinkage cavities. 12,13 Computer simulation modeling and experimental tests allowed to study the effect of cooling rates and temperature gradients on the formation of macroshrinkage porosity.…”

Section: Introductionmentioning

confidence: 99%

Enhanced High-Temperature Mechanical Behavior of an in Situ TiAl Matrix Composite Reinforced With Alumina

et al. 2022

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A Ti-45Al-3Cr-2.5Nb alloy reinforced with in situ formed alumina has been produced by means of centrifugal casting by adding zirconium oxide in the crucible. The dispersion-strengthened alloy has been characterized to verify its microstructure and particle distribution. Mechanical tests carried out over the temperature range 850–950 °C highlighted that in situ formed alumina allows to increase the alloy yield stress by 21% at 850 °C and by 35% at 900 °C. Moreover, the in situ formed oxide particles produced an increase of the Young’s modulus of about 10% at 850 °C and of about 8% at 900 °C. Considering that the tested alloy has a density that is about a half of nickel superalloys, obtaining high specific mechanical properties over the temperature range 850–950 °C can boost its application in the production of turbine blades. Graphical abstract

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Lamellae Orientation Control and Mechanical Properties of Directionally Solidified Binary Ti-49Al Alloy in Oxide Ceramics Crucible

Cited by 8 publications

References 46 publications

Review on Progress of Lamellar Orientation Control in Directionally Solidified TiAl Alloys

Review on Progress of Lamellar Orientation Control in Directionally Solidified TiAl Alloys

Crystal plasticity modeling fatigue behavior in bimodal Ti–6Al–4V: Effects of microdefect and lamellar orientation

Enhanced High-Temperature Mechanical Behavior of an in Situ TiAl Matrix Composite Reinforced With Alumina

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