Journal ArticleDOI
Effects of microstructure on the deformation and fracture of γ-TiAl alloys
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TLDR
In this article, the effects of microstructure on tensile properties and deformation-fracture behavior are analyzed for deformation temperatures below and above the brittle-ductile transition.Abstract:
Deformation and fracture behavior of two-phase γ-TiAl alloys were investigated under monotonic tension loading conditions for duplex and lamellar microstructural forms. The effects of microstructure on tensile properties and deformation-fracture behavior are analyzed for deformation temperatures below and above the brittle-ductile transition. The crack initiation toughness and associated strains near the crack tip are used to explain the inverse relationship between ductility and toughness observed at room temperature. Fracture resistance behavior and toughening mechanisms at room temperature are explained in terms of microstructure and deformation anisotropy. The competition between the effects of grain size and lamellar spacing or tensile and toughness properties is discussed.read more
Citations
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Design, Processing, Microstructure, Properties, and Applications of Advanced Intermetallic TiAl Alloys†
Helmut Clemens,Svea Mayer +1 more
TL;DR: In this article, a general survey of engineering γ-TiAl based alloys is given, but concentrates on β-solidifying alloys which show excellent hot-workability and balanced mechanical properties when subjected to adapted heat treatments.
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
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
An overview of monolithic titanium aluminides based on Ti3Al and TiAl
TL;DR: In this article, the role of solidification paths, phase relations and transformations and micro-alloying effects is examined for titanium aluminides in the context of casting of near-net shaped components.
Journal ArticleDOI
Advances in Gammalloy Materials-Processes-Application Technology: Successes, Dilemmas, and Future
Young-Won Kim,Sang-Lan Kim +1 more
TL;DR: In this article, the authors evaluate current engineering gammalloys and their limitations and introduce eight strengthening pathways that can be adopted immediately for the development of advanced, higher temperature gammaloys.
References
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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.
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Plastic deformation and fracture of binary TiAl-base alloys
Shyh-Chin Huang,Ernest L. Hall +1 more
TL;DR: In this article, the mechanical behavior of binary TiAl alloys containing 46 to 60 at. pct Al has been studied in bulk materials prepared via rapid solidification processing and the results on the deformation and fracture modes as a function of test temperature are also discussed.
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Influence of microstructure on crack-tip micromechanics and fracture behaviors of a two-phase TiAl alloy
Kwai S. Chan,Young-Won Kim +1 more
TL;DR: In this paper, a two-phase (γ + α2) gamma titanium aluminide alloy, Ti-47Al-2.6Nb-2(Cr+V), heat-treated for the microstructure of either fine duplex (gamma + lamellar) or predominantly lamella micro-structure was studied in the 25 °C to 800 °C range.
Journal ArticleDOI
The effect of orientation and lamellar structure on the plastic behavior of TiAl crystals
TL;DR: In this article, the plastic behavior of binary TiAl was found to depend strongly on the lamellar spacing and the angle between the loading axis and the laminate planes, and it was shown that a fine and uniform distribution of lamellae is necessary to obtain high strength and good ductility.