Role of boron in TiAl alloy development: a review

Hu, D.

doi:10.1007/s12598-015-0615-1

Cited by 84 publications

(25 citation statements)

References 51 publications

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“…Based on this understanding, the traces labeled by the black arrows are actually the previous grain boundaries of a high temperature α grain. After careful observation of the traces in Figure 2, one can realize that the grain sizes of the α grains during 1340 • C heat treatment are similar, i.e., approximately 200-300 µm in both images, which is in accordance with other reports [31,32]. This finding can further lead to the conclusion that the growth rate of α grains may decrease with the increase of time.…”

Section: Effects Of Heat Treatment Parameters On the Massive Transforsupporting

confidence: 87%

“…The black arrows in Figure 2 indicate the locations of borides. As reviewed by Hu et al, the borides can act as barriers during the growth of α phase at high temperatures [31]. Based on this understanding, the traces labeled by the black arrows are actually the previous grain boundaries of a high temperature α grain.…”

Section: Effects Of Heat Treatment Parameters On the Massive Transformentioning

confidence: 90%

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Microstructure Evolution of a Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y Alloy during Massive Transformation and Subsequent Annealing

Song

Wang

Xue

et al. 2018

Metals

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It has been widely reported that the microstructure refinement of TiAl alloys can be achieved by massive transformation and subsequent annealing in α 2 + γ two phase field. To achieve this goal, several heat treatment parameters must be adjusted, including the heat treatment temperature around single α phase field, the annealing temperature, and the annealing time for the precipitation of α 2 phase. Thus, a systematic study is needed for each alloy with different compositions. In this study, the heat treatment parameters for grain refinement via massive transformation of a high Nb-containing TiAl are investigated. Precipitation of α 2 phase during annealing is observed by transmission electron microscopy. It is found that 30 min at single α phase field is appropriate for the massive transformation; a full, massively transformed microstructure cannot be obtained by oil or water quenching. A short annealing time can result in a refined microstructure, whereas the sizes of the precipitated α 2 phase increases with the increase of annealing time. The α 2 phase can form at the interface of twin boundaries of the γ phase, following the Blackburn orientation relationship with both sides. The Vickers hardness is measured for the annealed samples, which remains relatively stable for different annealing times.

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Section: Effects Of Heat Treatment Parameters On the Massive Transforsupporting

confidence: 87%

Section: Effects Of Heat Treatment Parameters On the Massive Transformentioning

confidence: 90%

Microstructure Evolution of a Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y Alloy during Massive Transformation and Subsequent Annealing

Song

Wang

Xue

et al. 2018

Metals

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“…Hu et al. found that the borides can be used as the heterogeneous nucleation during the β→α transition and refined lamellar colonies produced in the boron‐added alloys . Yang et al.…”

Section: Introductionmentioning

confidence: 99%

“…discovered that the more the amount of boron added, the less the content of the phase transition texture . However, it should be pointed out that the beneficial effects were suppressed as cracks appear on large titanium borides . Besides, the cooling rate during β→α transition takes an important place in determining the microstructure characteristics of α phase.…”

Section: Introductionmentioning

confidence: 99%

“…Hu et al found that the borides can be used as the heterogeneous nucleation during the → transition and refined lamellar colonies produced in the boronadded alloys. [7] Yang et al discovered that the more the amount of boron added, the less the content of the phase transition DOI: 10.1002/crat.201900183 texture. [8] However, it should be pointed out that the beneficial effects were suppressed as cracks appear on large titanium borides.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Deformation Temperature on the Microstructure Characteristics of α Phase in Ti‐40Al‐8Nb‐0.5B Alloys

Yang

Wang

et al. 2020

Crystal Research and Technology

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In this work, microstructure characteristics of α phase in Ti‐40Al‐8Nb‐0.5B alloys (at%) after deformation in the β and (β+α) phase regions are examined. The experimental results indicate that the microstructure characteristics of the α phase are considerably affected by the deformation temperature. During the deformation in the β phase area, the β phase is not only elongated perpendicular to the compression direction, but also presents a 〈100〉‐〈111〉 double fiber texture. After the β→α transformation, a part of the α phase exhibits an equiaxed morphology and the others show lath‐like shapes. Due to the microstructural heredity, the α phase of the sample deformed in the β phase field presents a 〈11‐20〉‐〈10‐10〉 double fiber texture. In contrast, refined α phase with randomly distributed orientation is produced after the deformation in the (β+α) phase field and this is caused by the dynamic recrystallization during the deformation process.

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Tribological and Corrosion Properties of Ni‐Cr‐Co‐Ti‐V Multi‐Principal Element Alloy Prepared by Vacuum Hot‐Pressing Sintering

et al. 2019

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In our work, an equiatomic Ni‐Cr‐Co‐Ti‐V multi‐principal element alloy is prepared by vacuum hot‐pressing sintering. The phase structure is investigated by Transmission electron microscopy (TEM) and properties of hardness, wear and corrosion resistance are studied. Furthermore, some reported high‐entropy alloys (HEAs) and conventional alloys are used as contrast for more intuitive evaluation of properties of Ni‐Cr‐Co‐Ti‐V HEA. The average micro‐hardness of this alloy reaches 1130 ± 15 HV. By nano‐indentation testing, the value of average Young's modulus and nano‐hardness are 318.6 ± 9 GPa and 17.21 ± 0.77 GPa, respectively. Compared with the room temperature, this alloy still keeps a good wear resistance at 600 °C and adhesive wear is the main wear mechanism. In the 3.5 wt% NaCl electrolyte, the passivating capacity of this alloy is significantly higher than that of 304 stainless steel and the corrosion rate of this alloy is relatively low, ≈0.035 mm/year. Thus, this alloy is expected to be applied in the severe interaction work environment of high temperature, wear, and corrosion.

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Role of boron in TiAl alloy development: a review

Cited by 84 publications

References 51 publications

Microstructure Evolution of a Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y Alloy during Massive Transformation and Subsequent Annealing

Microstructure Evolution of a Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y Alloy during Massive Transformation and Subsequent Annealing

Effect of Deformation Temperature on the Microstructure Characteristics of α Phase in Ti‐40Al‐8Nb‐0.5B Alloys

Tribological and Corrosion Properties of Ni‐Cr‐Co‐Ti‐V Multi‐Principal Element Alloy Prepared by Vacuum Hot‐Pressing Sintering

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