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Phase transformation behavior of a Mn containing beta-solidifying gamma-TiAl alloy during continuous cooling
Xu, Hao1,2; Li, Xiaobing1; Xing, Weiwei1; Shu, Lei1; Ma, Yingche1; Liu, Kui1
Corresponding AuthorLi, Xiaobing(xbli@imr.ac.cn)
2018-08-01
Source PublicationINTERMETALLICS
ISSN0966-9795
Volume99Pages:51-58
AbstractThe research was mainly focused on the phase transformation of Ti-42Al-5Mn (at%) alloy produced by vacuum induction melting (VIM) and vacuum arc remelting (VAR) followed by wrought process. The phase transformation kinetics of the alloy during continuous cooling under the cooling rates of 0.1 degrees C/s, 0.5 degrees C/s, 2 degrees C/s, 10 degrees C/ s, 50 degrees C/s, and 200 degrees C/s were identified by the Gleeble-3800 system, which is finally used to construct a schematic continuous cooling transformation (CCT) diagram of this alloy. The related phase composition, microstructure and property of the alloy were studied using X-ray diffraction (XRD), electron probe micro analyzer (EPMA), transmission electron microscope (TEM) and Vickers hardness (HV). It shows that six kinds of phase transformation are existed during continuous cooling from 1300 degrees C with the cooling rates of 0.1 degrees C/s, 0.5 degrees C/s, 2 degrees C/s, 10 degrees C/s, 50 degrees C/s, 200 degrees C/s and WQ, including beta ->alpha(2)', beta ->alpha, beta ->gamma, beta ->beta(o)/alpha ->alpha(2), alpha(2)->alpha(2)/gamma and alpha(2)/gamma ->beta(o,sec).It reveals that partial transformations would be inhibited when the cooling rate is relatively high. The martensitic structures (alpha(2)') obtained by beta ->alpha(2) were formed under the WQ condition after holding at 1300 degrees C for 5min, and it will be completely restrained below the cooling rate of WQ. For the beta ->gamma, it is restrained if the cooling rates are higher than 50 degrees C/s. The alpha(2)->alpha(2)/gamma could be also suppressed when cooling with 200 degrees C/s, and the gamma lath within the supersaturated alpha(2)-grains would be formed at lower cooling rate below 50 degrees C/s. For 0.5 degrees C/s and 0.1 degrees C/s, a small amount of dotted beta(o) (beta(o,sec)) phases can be formed in the lamellar interfaces, which is proved the reaction products of alpha(2)/gamma ->beta(o,sec). Furthermore, the effect of cooling rates on the microstructure, including interlamellar spacing (lambda) and gamma grains are also identified and discussed.
KeywordTitanium aluminide Phase transformation Microstructure Kinetics CCT diagram
DOI10.1016/j.intermet.2018.05.004
Indexed BySCI
Language英语
WOS Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000436221800008
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/128656
Collection中国科学院金属研究所
Corresponding AuthorLi, Xiaobing
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Xu, Hao,Li, Xiaobing,Xing, Weiwei,et al. Phase transformation behavior of a Mn containing beta-solidifying gamma-TiAl alloy during continuous cooling[J]. INTERMETALLICS,2018,99:51-58.
APA Xu, Hao,Li, Xiaobing,Xing, Weiwei,Shu, Lei,Ma, Yingche,&Liu, Kui.(2018).Phase transformation behavior of a Mn containing beta-solidifying gamma-TiAl alloy during continuous cooling.INTERMETALLICS,99,51-58.
MLA Xu, Hao,et al."Phase transformation behavior of a Mn containing beta-solidifying gamma-TiAl alloy during continuous cooling".INTERMETALLICS 99(2018):51-58.
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