Nucleation of massive gamma during air cooling of Ti46Al8Ta

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Nucleation of massive gamma during air cooling of Ti46Al8Ta. / Jiang, H-X; Zhang, K; Hao, Xinjiang; Saage, H; Wain, Nicholas; Hu, Dawei; Loretto, Michael; Wu, Xinhua.

In: Intermetallics, Vol. 18, No. 5, 01.05.2010, p. 938-944.

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@article{6c88d80a9f3f4534b903c9745bef7f25,
title = "Nucleation of massive gamma during air cooling of Ti46Al8Ta",
abstract = "Interrupted quenching has been used to investigate the factors influencing the nucleation of massive gamma during air cooling of Ti46Al8Ta from the alpha phase field; air cooling directly to room temperature results in virtually 100% massive gamma and water quenching results in virtually 100% retained alpha. If samples are air cooled to successively lower temperatures within the (alpha + gamma) phase field, before being water quenched, it has been found that they contain increasing amounts of massive gamma. Measurements of the cooling rates during interrupted quenching and during air cooling to room temperature together with microstructural observations suggest that the undercooling required to nucleate massive gamma is reduced by the presence of {"}equilibrium{"} grain boundary gamma formed above To. It has been shown that a (111) of the massive gamma is parallel with a (111) of the grain boundary gamma implying that the massive gamma is nucleated by the grain boundary gamma. These observations are discussed in terms of the factors which influence nucleation of massive gamma. The formation of significant amounts of grain boundary gamma above To (the temperature above which massive gamma cannot form) sets a lower limit to the cooling rate which can be used to generate virtually 100% massive gamma. (C) 2010 Elsevier Ltd. All rights reserved.",
keywords = "Titanium aluminides, based on TiAl, Phase transformation",
author = "H-X Jiang and K Zhang and Xinjiang Hao and H Saage and Nicholas Wain and Dawei Hu and Michael Loretto and Xinhua Wu",
year = "2010",
month = may,
day = "1",
doi = "10.1016/j.intermet.2010.01.006",
language = "English",
volume = "18",
pages = "938--944",
journal = "Intermetallics",
issn = "0966-9795",
publisher = "Elsevier",
number = "5",

}

RIS

TY - JOUR

T1 - Nucleation of massive gamma during air cooling of Ti46Al8Ta

AU - Jiang, H-X

AU - Zhang, K

AU - Hao, Xinjiang

AU - Saage, H

AU - Wain, Nicholas

AU - Hu, Dawei

AU - Loretto, Michael

AU - Wu, Xinhua

PY - 2010/5/1

Y1 - 2010/5/1

N2 - Interrupted quenching has been used to investigate the factors influencing the nucleation of massive gamma during air cooling of Ti46Al8Ta from the alpha phase field; air cooling directly to room temperature results in virtually 100% massive gamma and water quenching results in virtually 100% retained alpha. If samples are air cooled to successively lower temperatures within the (alpha + gamma) phase field, before being water quenched, it has been found that they contain increasing amounts of massive gamma. Measurements of the cooling rates during interrupted quenching and during air cooling to room temperature together with microstructural observations suggest that the undercooling required to nucleate massive gamma is reduced by the presence of "equilibrium" grain boundary gamma formed above To. It has been shown that a (111) of the massive gamma is parallel with a (111) of the grain boundary gamma implying that the massive gamma is nucleated by the grain boundary gamma. These observations are discussed in terms of the factors which influence nucleation of massive gamma. The formation of significant amounts of grain boundary gamma above To (the temperature above which massive gamma cannot form) sets a lower limit to the cooling rate which can be used to generate virtually 100% massive gamma. (C) 2010 Elsevier Ltd. All rights reserved.

AB - Interrupted quenching has been used to investigate the factors influencing the nucleation of massive gamma during air cooling of Ti46Al8Ta from the alpha phase field; air cooling directly to room temperature results in virtually 100% massive gamma and water quenching results in virtually 100% retained alpha. If samples are air cooled to successively lower temperatures within the (alpha + gamma) phase field, before being water quenched, it has been found that they contain increasing amounts of massive gamma. Measurements of the cooling rates during interrupted quenching and during air cooling to room temperature together with microstructural observations suggest that the undercooling required to nucleate massive gamma is reduced by the presence of "equilibrium" grain boundary gamma formed above To. It has been shown that a (111) of the massive gamma is parallel with a (111) of the grain boundary gamma implying that the massive gamma is nucleated by the grain boundary gamma. These observations are discussed in terms of the factors which influence nucleation of massive gamma. The formation of significant amounts of grain boundary gamma above To (the temperature above which massive gamma cannot form) sets a lower limit to the cooling rate which can be used to generate virtually 100% massive gamma. (C) 2010 Elsevier Ltd. All rights reserved.

KW - Titanium aluminides, based on TiAl

KW - Phase transformation

U2 - 10.1016/j.intermet.2010.01.006

DO - 10.1016/j.intermet.2010.01.006

M3 - Article

VL - 18

SP - 938

EP - 944

JO - Intermetallics

JF - Intermetallics

SN - 0966-9795

IS - 5

ER -