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Microstructural characteristics of the microphase Y-Ti2SC in nickel-based superalloys
X. B. Hu; Y. B. Xue; S. J. Zheng; Y. L. Zhu; D. Chen; X. L. Ma
2014
Source PublicationJournal of Alloys and Compounds
ISSN0925-8388
Volume611Pages:104-110
AbstractThe microstructural characteristics of microphase Y-Ti2SC in Ni-based superalloys have been studied by means of analytical transmission electron microscopy (TEM). In the standard heat treated samples, the Y phase always exhibits slab morphology forming either the sandwiched plate in MC or the side-by-side structure with MC. Moreover, the Y phase also maintains an definite crystallographic orientation relationship of [1 (2) over bar 10](Y)//[1 (1) over bar0](MC) and (0001)(Y)//(111)(MC) with the MC-type carbide. Stacking fault which results from the insertion of two Ti-C layers has been identified in the Y-Ti2SC phase. Combined with high resolution TEM (HRTEM) and first-principles calculations, we also determine the most stable interfacial structure between Y phase and MC carbide. Additionally, we find that Y-Ti2SC phase can solutionize amounts of beneficial elements Hf and Zr from the matrix during long-term annealing process, which leads to its lattice expansion. This solution phenomenon is detrimental for superalloys due to the consumption of the beneficial elements. (C) 2014 Elsevier B. V. All rights reserved.
description.department[hu, x. b. ; xue, y. b. ; zheng, s. j. ; zhu, y. l. ; chen, d. ; ma, x. l.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. ; ma, xl (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. ; xlma@imr.ac.cn
KeywordNi-based Superalloys Transmission Electron Microscopy Y-ti2sc Phase Mc-type Carbide Interface Total-energy Calculations Augmented-wave Method Mechanical-properties Basis-set Sulfur Ti2sc Interface Ti3sic2 1st-principles Solidification
URL查看原文
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/73244
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
X. B. Hu,Y. B. Xue,S. J. Zheng,et al. Microstructural characteristics of the microphase Y-Ti2SC in nickel-based superalloys[J]. Journal of Alloys and Compounds,2014,611:104-110.
APA X. B. Hu,Y. B. Xue,S. J. Zheng,Y. L. Zhu,D. Chen,&X. L. Ma.(2014).Microstructural characteristics of the microphase Y-Ti2SC in nickel-based superalloys.Journal of Alloys and Compounds,611,104-110.
MLA X. B. Hu,et al."Microstructural characteristics of the microphase Y-Ti2SC in nickel-based superalloys".Journal of Alloys and Compounds 611(2014):104-110.
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