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Investigation of microstructure in hot-pressed Nb-23Ti-15Al alloy
Z. W.; Wei Shi, H.; Zhang, H. Y.; Wu, D. L.; Jin, T.; Sun, X. F.; Zheng, Q.
2015
Source PublicationJournal of Alloys and Compounds
ISSN0925-8388
Volume636Pages:61-66
AbstractMicrostructure of hot-pressed Nb-23Ti-15Al alloy has been systematically investigated, with emphasis on the characterization of Ti(O, C) phase. The microstructure and composition of Nb-23Ti-15Al alloy were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and electron probe microanalysis (EPMA). The results indicate the presence of beta, delta and Ti(O, C) phases in the alloy. The b phase exhibits as large irregular blocks, while the d phase presents as small equiaxed particles linked together around b blocks. Ordering of b phase is shown by related selected area electronic diffraction (SAED) patterns and dark-field micrograph. The Ti(O, C), a solid-solution of TiO or TiC, is characterized for the first time in Nb-Ti-Al alloy. The Ti(O, C) has a face-centered cubic (FCC) structure and a moderate lattice parameter between that of TiO and TiC. Two different morphologies of Ti(O, C) are observed in the alloy: large cobblestone-like aggregated particles and small dispersive particles. The formation of Ti(O, C) phase can potentially increase high-temperature strength of Nb-Ti-Al alloy. (C) 2015 Elsevier B.V. All rights reserved.
description.department[shi, zhiwu ; wei, hua ; zhang, hongyu ; wu, duoli ; jin, tao ; sun, xiaofeng ; zheng, qi] chinese acad sci, inst met res, superalloys div, shenyang 110016, peoples r china. ; zheng, q (reprint author), chinese acad sci, inst met res, superalloys div, 72 wenhua rd, shenyang 110016, peoples r china. ; qzheng@imr.ac.cn
KeywordHigh-temperature Alloys Powder Metallurgy Microstructure Nb-ti-al Ordering Ti(o Transmission Electron-microscopy c) Phase Ti-al Alloys Mechanical-properties Phase-transformations Fracture-toughness Titanium Carbide Composite Oxidation Solidification Deformation
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/73915
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Z. W.,Wei Shi, H.,Zhang, H. Y.,et al. Investigation of microstructure in hot-pressed Nb-23Ti-15Al alloy[J]. Journal of Alloys and Compounds,2015,636:61-66.
APA Z. W..,Wei Shi, H..,Zhang, H. Y..,Wu, D. L..,Jin, T..,...&Zheng, Q..(2015).Investigation of microstructure in hot-pressed Nb-23Ti-15Al alloy.Journal of Alloys and Compounds,636,61-66.
MLA Z. W.,et al."Investigation of microstructure in hot-pressed Nb-23Ti-15Al alloy".Journal of Alloys and Compounds 636(2015):61-66.
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