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Investigation of the phase transformations in Ti-22Al-25Nb alloy

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Investigation of the phase transformations in Ti-22Al-25Nb alloy. / Shao, Bin; Zong, Yingying; Wen, Daosheng et al.
In: Materials Characterization, Vol. 114, 04.2016, p. 75-78.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Shao, B, Zong, Y, Wen, D, Tian, Y & Shan, D 2016, 'Investigation of the phase transformations in Ti-22Al-25Nb alloy', Materials Characterization, vol. 114, pp. 75-78. https://doi.org/10.1016/j.matchar.2016.02.011

APA

Shao, B., Zong, Y., Wen, D., Tian, Y., & Shan, D. (2016). Investigation of the phase transformations in Ti-22Al-25Nb alloy. Materials Characterization, 114, 75-78. https://doi.org/10.1016/j.matchar.2016.02.011

Vancouver

Shao B, Zong Y, Wen D, Tian Y, Shan D. Investigation of the phase transformations in Ti-22Al-25Nb alloy. Materials Characterization. 2016 Apr;114:75-78. Epub 2016 Feb 23. doi: 10.1016/j.matchar.2016.02.011

Author

Shao, Bin ; Zong, Yingying ; Wen, Daosheng et al. / Investigation of the phase transformations in Ti-22Al-25Nb alloy. In: Materials Characterization. 2016 ; Vol. 114. pp. 75-78.

Bibtex

@article{2ac2956781624bdda82f623cc7a5b80b,
title = "Investigation of the phase transformations in Ti-22Al-25Nb alloy",
abstract = "In this paper, changes in the morphology and composition of the O, α2 and B2/β phases and the transformation relationship between the three phases of Ti22Al25Nb alloy were systematically investigated by performing a series of short heat treatments. The results showed that the phase transformations can be divided into three stages in the temperature range of 870 °C ~ 1080 °C. In the first stage of 870 °C ~ 930 °C, the O phase started transferring to α2 + B2 first along grain boundaries with lamellar morphology due to short-range diffusion, and the O → α2 + B2 reaction was accompanied by a large amount of Nb segregation. With the increase in temperature, the phase transformation migrated from the boundaries to the inside of the grains, and the α2-phase spheroidized gradually. In the second stage from 960 °C to 1020 °C, granular α2 and B2 phases precipitated directly from the O phase due to long-range diffusion. At 1020 °C, the O → α2 + B2 transition was completed and the granular α2 phase mainly populated along the grain boundaries. In the third stage above 1020 °C, the main phase transformation was α2 → B2, and the aggregation and growth of the α2 phase were observed in α2-rich regions.",
keywords = "Ti2AlNb, Phase transformation, Segregation, Spheroidization, Diffusion",
author = "Bin Shao and Yingying Zong and Daosheng Wen and Yingtao Tian and Debin Shan",
year = "2016",
month = apr,
doi = "10.1016/j.matchar.2016.02.011",
language = "English",
volume = "114",
pages = "75--78",
journal = "Materials Characterization",
issn = "1873-4189",
publisher = "Elsevier Inc.",

}

RIS

TY - JOUR

T1 - Investigation of the phase transformations in Ti-22Al-25Nb alloy

AU - Shao, Bin

AU - Zong, Yingying

AU - Wen, Daosheng

AU - Tian, Yingtao

AU - Shan, Debin

PY - 2016/4

Y1 - 2016/4

N2 - In this paper, changes in the morphology and composition of the O, α2 and B2/β phases and the transformation relationship between the three phases of Ti22Al25Nb alloy were systematically investigated by performing a series of short heat treatments. The results showed that the phase transformations can be divided into three stages in the temperature range of 870 °C ~ 1080 °C. In the first stage of 870 °C ~ 930 °C, the O phase started transferring to α2 + B2 first along grain boundaries with lamellar morphology due to short-range diffusion, and the O → α2 + B2 reaction was accompanied by a large amount of Nb segregation. With the increase in temperature, the phase transformation migrated from the boundaries to the inside of the grains, and the α2-phase spheroidized gradually. In the second stage from 960 °C to 1020 °C, granular α2 and B2 phases precipitated directly from the O phase due to long-range diffusion. At 1020 °C, the O → α2 + B2 transition was completed and the granular α2 phase mainly populated along the grain boundaries. In the third stage above 1020 °C, the main phase transformation was α2 → B2, and the aggregation and growth of the α2 phase were observed in α2-rich regions.

AB - In this paper, changes in the morphology and composition of the O, α2 and B2/β phases and the transformation relationship between the three phases of Ti22Al25Nb alloy were systematically investigated by performing a series of short heat treatments. The results showed that the phase transformations can be divided into three stages in the temperature range of 870 °C ~ 1080 °C. In the first stage of 870 °C ~ 930 °C, the O phase started transferring to α2 + B2 first along grain boundaries with lamellar morphology due to short-range diffusion, and the O → α2 + B2 reaction was accompanied by a large amount of Nb segregation. With the increase in temperature, the phase transformation migrated from the boundaries to the inside of the grains, and the α2-phase spheroidized gradually. In the second stage from 960 °C to 1020 °C, granular α2 and B2 phases precipitated directly from the O phase due to long-range diffusion. At 1020 °C, the O → α2 + B2 transition was completed and the granular α2 phase mainly populated along the grain boundaries. In the third stage above 1020 °C, the main phase transformation was α2 → B2, and the aggregation and growth of the α2 phase were observed in α2-rich regions.

KW - Ti2AlNb

KW - Phase transformation

KW - Segregation

KW - Spheroidization

KW - Diffusion

U2 - 10.1016/j.matchar.2016.02.011

DO - 10.1016/j.matchar.2016.02.011

M3 - Journal article

VL - 114

SP - 75

EP - 78

JO - Materials Characterization

JF - Materials Characterization

SN - 1873-4189

ER -