Results 161 to 170 of about 3,427 (205)

Fatigue properties of TiAl alloys

Intermetallics, 2005
Abstract The fatigue properties of TiAl alloys, namely fatigue life, cyclic stress–strain behaviour and fatigue crack growth resistance are reviewed in the present paper. The influence of different parameters (microstructure, defects, temperature and environment) on these properties is examined. Finally, some considerations on the fatigue reliability
Gilbert Hénaff, Anne-Lise Gloanec
openaire   +1 more source

Dislocation dissociation in TiAl alloys

Materials Science and Engineering: A, 1997
Two superdislocation configurations consisting in an asymmetric planar dissociation on one octahedral plane, and symmetric wedge shape dissociation on two inclined octahedral planes are analysed using anisotropic elasticity. The presented results can be used to evaluated the stacking fault energies from the measured widths of dissociation.
V. Paidar, H. Inui, K. Kishida, M. Yamaguchi   +3 more
openaire   +1 more source

TiAl-based alloys with nickel

Intermetallics, 1996
Abstract The alloying potential of nickel as a minor constituent has been investigated in TiAl-based intermetallics with respect to its constitutional ability to provide the necessary microstructures for higher ductility and low fracture toughness. Six alloys (Ti0.60Al0.40)1 − x1Nix1 and (Ti0.56Al0.44)1 − x2Nix2 with x1.2 = 0.01, 0.02 and 0.05 have ...
Josef Bauer, Peter Rogl, André Perrin, Marcel Bohn, Walter Wolf, Raimund Podloucky, Yannick LeFriec, David Antoine   +7 more
openaire   +1 more source

Advanced Intermetallic TiAl Alloys

Materials Science Forum, 2016
Challenging issues concerning energy efficiency and environmental politics require novel approaches to materials design. A recent example with regard to structural materials is the emergence of lightweight intermetallic TiAl alloys. Their excellent high-temperature mechanical properties, low density, and high stiffness constitute a profile perfectly ...
Helmut Clemens, Svea Mayer
openaire   +1 more source

Isothermal oxidation of TiAl alloy

Metallurgical and Materials Transactions A, 2001
Isothermal oxidation behavior of Ti-48.6 at. pct Al alloy was studied in pure dry oxygen over the temperature range 850 °C to 1000 °C. The oxidation was essentially parabolic at all temperatures with significant increase in the rate at 1000 °C. Effective activation energy of 404 kJ/mol was deduced. The oxidation products were a mixture of TiO2 (rutile)
R. G. Reddy, X. Wen, M. Divakar
openaire   +1 more source

TiAl formation by mechanical alloying

Materials Science and Engineering: A, 1992
Abstract Formation of equiatomic TiAl has been achieved through mechanical alloying of powders of two brittle compounds Al 3 Ti and TiH 2 . The influence of milling time, compaction of the powder by hot isostatic pressing, and elevated temperature exposure on the species and proportion of phases formed has been determined.
C Suryanarayana, R Sundaresan, F.H Froes
openaire   +1 more source

Mechanism of isothermal oxidation of the intel-metallic TiAl and of TiAl alloys

Oxidation of Metals, 1992
The oxidation behavior of Ti36Al, Ti35Al-0.1C, Ti35Al-1.4V-0.1C, and Ti35 Al-5Nb-0.1C (mass-%) in air and oxygen has been studied between 700 and 1000°C with the major emphasis at 900°C. Generally an oxide scale consisting of two layers, an outward- and an inward-growing layer, formed.
S. Becker, A. Rahmel, M. Schorr, M. Sch�tze   +3 more
openaire   +1 more source

Review of alloy and process development of TiAl alloys

Intermetallics, 2006
Abstract The improved understanding of the factors that control microstructure and properties of TiAl alloys is reviewed together with current work aimed at developing both wrought and cast products. It is suggested that the choice of alloy composition is perhaps far simpler than the complex literature would suggest and the factors that underlie ...
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source