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Solidification pathway and phase transformation behavior in a beta-solidified gamma-TiAl based alloy
Xu, H.; Li, X. B.; Xing, W. W.; Shu, L.; Ma, Y. C.; Liu, K.
2019-11-01
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume35Issue:11Pages:2652-2657
AbstractThe phase transformation behavior of an as-cast Ti-42Al-5 Mn (at.%) alloy after subsequent quenching from 1380 degrees C to 1000 degrees C was investigated based on the differential thermal analysis (DTA), electron probe micro analyzer-backscattered electrons (EPMA-BSE), transmission electron microscope (TEM) and X-ray diffraction (XRD). The results show that, the solidification path can be summarized as follows: Liquid -> Liquid+beta ->beta ->beta+alpha ->beta+alpha+gamma ->beta(o)+alpha(2)+gamma ->beta(o)+gamma+alpha(2)/gamma+beta(0,sec), with the phase transformation alpha ->beta temperature (T-beta) = 1311 degrees C, phase transformation gamma ->beta temperature of (T-gamma solv) = 1231 degrees C, phase transformation alpha(2)->alpha or beta(o)->beta temperature (T-alpha 2 ->alpha/T-beta o ->beta) = 1168 degrees C, eutectoid temperature (T-eut) = 1132 degrees C and T-alpha 2/gamma ->beta o,T-sec approximate to 1120 degrees C. In comparison with Ti-42Al alloy, the T-eut and T-gamma solv are slightly increased while both the T-beta is decreased obviously by 5% Mn addition. When quenched from the temperature of 1380-1260 degrees C, the martensitic transformation beta ->alpha' could occur to form the needle-like martensite structure in beta area. This kind of martensitic structure is much obvious with the increase of temperature from 1260 degrees C to 1380 degrees C. When the temperature is below T-gamma solv (1231 degrees C), the gamma grains would nucleate directly from the beta phase. For the temperature slightly lower than T-eut (1132 degrees C), the dotted beta(o,sec) phases could nucleate in the lamellar colonies besides the gamma lamellae precipitated within alpha(2) phase. Finally, at room-temperature (RT), the alloy exhibits (beta(o)+alpha(2)+gamma) triple phase with microstructure of beta(o) +lamellae+gamma, of which the lamellar structure consists of alpha(2), gamma and beta(o,sec) phases. The phase transformation mechanisms in this alloy, involving beta ->alpha', beta ->gamma, alpha 2 ->alpha 2/gamma and alpha(2)->beta(o,sec) were discussed. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
KeywordTitanium aluminides Quenching Phase transformation Microstructure beta phase
Indexed BySCI
Language英语
WOS IDWOS:000497965900027
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/80654
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Xu, H.,Li, X. B.,Xing, W. W.,et al. Solidification pathway and phase transformation behavior in a beta-solidified gamma-TiAl based alloy[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2019,35(11):2652-2657.
APA Xu, H.,Li, X. B.,Xing, W. W.,Shu, L.,Ma, Y. C.,&Liu, K..(2019).Solidification pathway and phase transformation behavior in a beta-solidified gamma-TiAl based alloy.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,35(11),2652-2657.
MLA Xu, H.,et al."Solidification pathway and phase transformation behavior in a beta-solidified gamma-TiAl based alloy".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 35.11(2019):2652-2657.
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