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Structural stability and the alloying effect of TiB polymorphs in TiAl alloys
Liu, B. G.; Liu, L. H.; Xing, W. D.; Liu, R. C.; Yang, R.; Withey, P. A.; Zhu, J.; Yu, R.; Yu, R (reprint author), Tsinghua Univ, Sch Mat Sci & Engn, Natl Ctr Electron Microscopy Beijing, Beijing 100084, Peoples R China.
2017-11-01
Source PublicationELSEVIER SCI LTD
ISSN0966-9795
Volume90Pages:97-102
AbstractBorides have been widely used in cast TiAl alloy for grain refinement and a variety of stoichiometry and crystal structure of borides were reported. Here the effects of alloying elements Nb, Ta, and Mn on the structural stability of fine boride precipitates in TiAl alloys have been studied combining transmission electron microscopy (TEM) and first-principles calculations. The results show that most boride particles have the TiB stoichiometry. In the alloy containing Nb and Mn, all the TiB particles have the B27 structure and are highly enriched with Nb but depleted with Mn. In the alloy containing Nb and Ta, however, the intergrowth of B-f and B27 structure has been observed, and the TiB particles are enriched with both Nb and Ta. First-principles calculations reveal different effects of Nb, Ta, and Mn on the structural stability of TiB polymorphs. Nb stabilizes B27 but destabilizes B-f. Ta strongly stabilizes both B27 and B-f structures. Mn strongly destabilizes both B27 and B-f structures.; Borides have been widely used in cast TiAl alloy for grain refinement and a variety of stoichiometry and crystal structure of borides were reported. Here the effects of alloying elements Nb, Ta, and Mn on the structural stability of fine boride precipitates in TiAl alloys have been studied combining transmission electron microscopy (TEM) and first-principles calculations. The results show that most boride particles have the TiB stoichiometry. In the alloy containing Nb and Mn, all the TiB particles have the B27 structure and are highly enriched with Nb but depleted with Mn. In the alloy containing Nb and Ta, however, the intergrowth of B-f and B27 structure has been observed, and the TiB particles are enriched with both Nb and Ta. First-principles calculations reveal different effects of Nb, Ta, and Mn on the structural stability of TiB polymorphs. Nb stabilizes B27 but destabilizes B-f. Ta strongly stabilizes both B27 and B-f structures. Mn strongly destabilizes both B27 and B-f structures.
description.department[liu, b. g. ; liu, l. h. ; xing, w. d. ; zhu, j. ; yu, r.] tsinghua univ, sch mat sci & engn, natl ctr electron microscopy beijing, beijing 100084, peoples r china ; [liu, b. g. ; liu, l. h. ; xing, w. d. ; zhu, j. ; yu, r.] tsinghua univ, sch mat sci & engn, key lab adv mat, minist educ china, beijing 100084, peoples r china ; [liu, b. g. ; liu, l. h. ; xing, w. d. ; zhu, j. ; yu, r.] tsinghua univ, sch mat sci & engn, state key lab new ceram & fine proc, beijing 100084, peoples r china ; [liu, r. c. ; yang, r.] chinese acad sci, inst met res, shenyang 110016, liaoning, peoples r china ; [withey, p. a.] rolls royce plc, derby de24 8bj, england
KeywordTitanium Aluminides Borides Structural Stability Transmission Electron Microscopy First-principles Calculations
Subject AreaChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNSFC [51525102, 51390475, 51371102]; National Basic Research Program of China [2015CB654902]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79022
Collection中国科学院金属研究所
Corresponding AuthorYu, R (reprint author), Tsinghua Univ, Sch Mat Sci & Engn, Natl Ctr Electron Microscopy Beijing, Beijing 100084, Peoples R China.
Recommended Citation
GB/T 7714
Liu, B. G.,Liu, L. H.,Xing, W. D.,et al. Structural stability and the alloying effect of TiB polymorphs in TiAl alloys[J]. ELSEVIER SCI LTD,2017,90:97-102.
APA Liu, B. G..,Liu, L. H..,Xing, W. D..,Liu, R. C..,Yang, R..,...&Yu, R .(2017).Structural stability and the alloying effect of TiB polymorphs in TiAl alloys.ELSEVIER SCI LTD,90,97-102.
MLA Liu, B. G.,et al."Structural stability and the alloying effect of TiB polymorphs in TiAl alloys".ELSEVIER SCI LTD 90(2017):97-102.
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