Journal ArticleDOI
On the origin of superior high strength of Ti–45Al–10Nb alloys
W.J. Zhang,S.C. Deevi,G.L. Chen +2 more
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In this article, the authors investigated the impact of Nb additions on the performance of TiAl alloys with and without Nb addition and found that the hardening effect was dependent on the Al content of γ phase, being less significant in the phase containing higher aluminum.About:
This article is published in Intermetallics.The article was published on 2002-05-01. It has received 100 citations till now. The article focuses on the topics: Hardening (metallurgy) & Microstructure.read more
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Advances in gamma titanium aluminides and their manufacturing techniques
TL;DR: Gamma titanium aluminides display attractive properties for high temperature applications as discussed by the authors, including microstructure, deformation mechanisms, and alloy development, which has led to the production of gamma-titanium aluminide sheets.
Journal ArticleDOI
Grain refinement in γ-Ti–Al-based alloys by solid state phase transformations
Helmut Clemens,Arno Bartels,Slawomir Bystrzanowski,Harald F. Chladil,Harald Leitner,Gerhard Dehm,Rainer Gerling,F.-P. Schimansky +7 more
TL;DR: In this paper, a massive phase transformation was used for microstructural refinement of a coarse-grained fully lamellar ingot, which was characterized by hardness measurements and the variation of the c / a -ratio of the tetragonal γ-TiAl cell as obtained from X-ray diffraction.
Journal ArticleDOI
High carbon solubility in a γ-TiAl-based Ti–45Al–5Nb–0.5C alloy and its effect on hardening
Christina Scheu,Christina Scheu,Erich Stergar,Michael Schober,Limei Cha,Helmut Clemens,Arno Bartels,F.-P. Schimansky,Alfred Cerezo +8 more
TL;DR: In this paper, the C distribution within the γ-TiAl-phase of a Ti-45Al-5Nb-0.5C alloy with near-γ microstructure was studied by atom probe tomography.
Journal ArticleDOI
Flow characteristics and constitutive modeling for elevated temperature deformation of a high Nb containing TiAl alloy
TL;DR: In this article, the hot deformation behavior of a high Nb containing TiAl alloy with a nominal composition of Ti-42Al-8Nb-(W, B, Y) was investigated at temperatures ranging from 1000 to 1150°C and strain rates from 10 −3 ǫs −1 to 0.5 ǔ s −1 on a Gleeble thermo-simulation machine.
Journal ArticleDOI
Microstructure and mechanical properties of high niobium containing TiAl alloys elaborated by spark plasma sintering
Houria Jabbar,Jean-Philippe Monchoux,Florent Houdellier,Mickaël Dollé,Frank-Peter Schimansky,Florian Pyczak,Marc Thomas,Alain Couret +7 more
TL;DR: In this paper, two-phased, duplex and lamellar microstructures have been obtained for pre-alloyed powders (Tie-46Al-9Nb) sintered between 975 and 1300 °C under 100 MPa.
References
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High-temperature ordered intermetallic alloys
TL;DR: In this article, the authors describe the behavior of grain boundaries in a two-dimensional model ordered alloy and the effects of elastic anisotropy on the anomalious yield behavior of cubic ordered alloys.
Journal ArticleDOI
Gamma titanium aluminides
TL;DR: The first International Symposium on Gamma Titanium Aluminides (ISGTA) was held in conjunction with the TMS '95 Annual Meeting, 13-16 February 1995, Las Vegas, under the sponsorship of the Structural Materials Division--Titanium Committee as discussed by the authors, which covered almost the entire aspects of the current gamma technology such as fundamentals, alloy development and design, process development, microstructure and property evaluation, and applications.
Journal ArticleDOI
Microstructure and deformation of two-phase γ-titanium aluminides
TL;DR: In this paper, the current knowledge on dislocation types and slip systems, the development of deformation substructures, factors controlling the mobility and multiplication of dislocations, interface related plasticity, solid solution and precipitate strengthening mechanisms as well as microscopic aspects of creep and fracture are addressed.
Journal ArticleDOI
The deformation and fracture of TiAl at elevated temperatures
TL;DR: In this paper, the tensile properties of the intermetallic compound TiAl have been determined at several temperatures in the range 25 to 1000°C, and the results indicate that the ductilebrittle transition behavior of TiAl at about 700°C is controlled by the trailinga/6 [112] partial dislocation components of the superdislocations overcoming their pinning barriers.
Journal ArticleDOI
The compression behaviour of niobium alloyed γ-titanium alumindies
TL;DR: In this paper, the underlying mechanisms behind the reported high strength of titanium aluminide alloys containing a large addition of niobium has been investigated by determining the flow stresses and activation parameters of plastic deformation.
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