| Active Eutectoid Decomposition of α → γ + τ _1 and the Morphological Evolution in a Ru-Containing TiAl Alloy |
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| 作者姓名： | Yulun Wu Rui Hu Jieren Yang Keren Zhang Xuyang Wang |
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| 作者单位： | State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China;State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China;Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment,Northwestern Polytechnical University,Xi'an 710072,China;State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China;Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment,Northwestern Polytechnical University,Xi'an 710072,China;School of Materials Science and Engineering,Sichuan University,Chengdu 610065,China |
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| 摘 要： | The active eutectoid decomposition and its morphological evolution during slow cooling and isothermal holding were investigated in a Ru-containing Ti Al alloy. The fine τ 1/γ active eutectoid nodules precipitated at α grain boundary and interior during water quenching. The active eutectoid microstructure evolved from sheaf-like, granular to bulky net-like sluggish eutectoid morphology gradually with the decrease in quenching/holding temperatures. The active eutectoid reaction occurs from 1220 to 1290 ℃, while the beginning temperature of sluggish eutectoid locates at 1305 ± 5 ℃. The combination of the intact τ_1 phase and immature nano-sized γ laths suggests a short incubation period of τ_1 phase in the active type. Furtherly, the semiquantitative estimation shows that the growth velocity of active eutectoid is about ninety times higher than sluggish type. In addition, a representative feature of γ phase abruptly ripening along {111} crystallographic plane was also observed in the active eutectoid.
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