Phase identification and effect of W on the microstructure and micro-hardness of Ti2AlNb-based intermetallic alloys

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The O-phase (orthorhombic Ti2AlNb phase) intermetallic alloy has been considered one of the strongest materials for high temperature application. The primary compositions of the test alloys in this paper are Ti-22Al-27Nb (at.%) and Ti-22Al-20Nb-2W (at.%). By in-situ X-ray diffraction (XRD) tests, each phase is identified and the lattice parameters of each phase are calculated for different temperatures. XRD tests show that a T2AlNb-beta phase, partially ordered b.c.c. phase, exists besides O, alpha(2) and B2 that are usually expected in the Ti-Al-Nb alloy system. In this paper, the effects of tungsten on the microstructure and micro-hardness of a Tl2AlNb-based (O+b.c.c.) alloy are investigated. The effects of W on Ti2AlNb-based intermetallic alloys are widely known to cause a refinement of microstructure and improvement of mechanical strength, however, the reason has not yet been reported. In this paper, the role of W in the improvement of mechanical strength is clarified. The main effect of W addition is not the formation of a solid solution or the formation of W-precipitates but the refinement of the Widmanstatten structure. (C) 2002 Elsevier Science B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2003-02
Language
English
Article Type
Article
Keywords

ORTHORHOMBIC TI-22AL-20NB-2W ALLOY; TI3AL-NB ALLOY; O-PHASE

Citation

JOURNAL OF ALLOYS AND COMPOUNDS, v.350, no.1-2, pp.280 - 287

ISSN
0925-8388
DOI
10.1016/S0925-8388(02)00956-8
URI
http://hdl.handle.net/10203/79555
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