Results 271 to 280 of about 3,417 (305)

Surface tension of γ-TiAl-based alloys

Journal of Materials Science, 2009
Within the Integrated Project IMPRESS, funded by the EU, a concerted action was taken to determine the thermophysical properties of a c-TiAl-based alloys, suitable for casting of large turbine blades for aeroengines and stationary gas turbines. The challenge was to develop a castable alloy, free of grain refiners and susceptible to heat treatment ...
R Nowak, T Lanata, N Sobczak, E Ricci, D Giuranno, R Novakovic, D HollandMoritz, I Egry   +7 more
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Alignment of the TiAl/Ti3Al lamellar microstructure in TiAl alloys by directional solidification

Materials Science and Engineering: A, 1997
Abstract By using an appropriately oriented seed from the TiAl–Si system, the TiAl/Ti 3 Al lamellar microstructure was aligned parallel to the growth direction for ingots having compositions of Ti–47Al, Ti–43Al–3Si, and Ti–46.5Al–3Nb–0.5Si (at.%). Directional solidification was performed in a floating zone furnace at growth rates between 5 and 40 mm ...
D.R Johnson, Y Masuda, H Inui, M Yamaguchi   +3 more
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Effect of alloying elements on the behaviour of TiAl-based alloys

Intermetallics, 2014
Abstract TiAl-based alloys containing Nb, Mo and Cr have been produced by induction melting both under an Ar atmosphere and in vacuum. Fracture toughness and isothermal oxidation tests at 900 °C have been performed on a number of alloys in order to evaluate the effect of alloying elements on both fracture toughness and hot corrosion.
BROTZU, Andrea, FELLI, Ferdinando, PILONE, Daniela   +2 more
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Segregation of alloying elements in a fully lamellar TiAl alloy

Scripta Materialia, 2001
Abstract Alloying elements strongly segregate at ledges in the crept microstructure of Ti 48.55 Al 47 Cr 2 Nb 1 Ta 0.8 W 0.2 B 0.15 Si 0.3 alloy. The amount of segregation is related to the stress concentration and distorted lattice caused by the applied stress. The segregation can stabilize α 2 phase and improve creep resistance.
X.-W Du, J.N Wang, J Zhu
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Mechanical behavior of TiAl alloys

Science China Technological Sciences, 2023
HengGao Xiang, Yang Chen, ZhiXiang Qi, Gong Zheng, FengRui Chen, YueDe Cao, Xu Liu, Bing Zhou, Guang Chen   +8 more
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The site occupancies of alloying elements in TiAl and Ti3Al alloys

Acta Materialia, 1999
The site occupancies of V, Cr, Mn, Fe, Ni, Zr, Nb, Mo, Ta, Ga and Sn (1-5 at.%) in TiAl alloys with different compositions, and in Ti3Al with the compositions of Ti-26 at.%Al-(1-2 at.%)X, were measured by the atom location channelling enhanced microanalysis (ALCHEMI) method.
Y.L. Hao, D.S. Xu, Y.Y. Cui, R. Yang, D. Li   +4 more
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TiAl alloys in commercial aircraft engines

Materials at High Temperatures, 2016
The present article will describe aspects of the science and technology of titanium aluminide (TiAl) alloy system and summarise the low and high temperature mechanical and environmental properties exhibited by different alloy generations. In terms of processing developments, conventional gravity casting and near net shape casting would be discussed in ...
B. P. Bewlay, S. Nag, A. Suzuki, M. J. Weimer   +3 more
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Phase transformations in TiAl based alloys

Acta Materialia, 2005
Microstructural characteristics of a fully lamellar Ti49Al47Cr2Nb2 alloy have been investigated in different annealed conditions by quantitative transmission electron microscopy. Statistical analyses have yielded clear information about the γ–γ interfaces, the respective orientation groups of the γ phase, and the distribution of orientational variants.
Slim Zghal, Marc Thomas, Shigehisa Naka, Alphonse Finel, Alain Couret   +4 more
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Tensile Ductility of Cast TiAl Alloys

Materials Science Forum, 2010
The microstructural characteristics and room temperature tensile ductility in some cast TiAl alloys were analyzed. It was found that grain refinement, either through Q&A treatment in boron-free alloys or through low dose of boron addition in beta solidifying alloys with lamellar microstructures, is not sufficient for good ductility. For cast alloys
Da Wei Hu, Xin Hua Wu
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DRILLING OF INTERMETALLIC ALLOYS GAMMA TIAL

AIP Conference Proceedings, 2011
Due to their high strength/weight ratio and resistance to corrosion and wear, superalloys such as gamma TiAl or Inconel 718 appear as the best choice for the high mechanical/thermal demands in the vicinity of the combustion chamber of aircraft engines.
A. Beranoagirre, D. Olvera, L. N. López de Lacalle, G. Urbicain, Francisco Chinesta, Yvan Chastel, Mohamed El Mansori   +6 more
openaire   +1 more source