Journal ArticleDOI
Advanced Intermetallic TiAl Alloys
Helmut Clemens,Svea Mayer +1 more
TLDR
The 3rd generation TiAl alloys, such as the TNM alloy described in this paper, are complex multi-phase alloys which can be processed by ingot or powder metallurgy as well as precision casting methods as mentioned in this paper.Abstract:
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 suitable for their application as advanced aero-engine turbine blades or as turbocharger turbine wheels in next-generation automotive engines. Advanced so-called 3rd generation TiAl alloys, such as the TNM alloy described in this paper, are complex multi-phase alloys which can be processed by ingot or powder metallurgy as well as precision casting methods. Each process leads to specific microstructures which can be altered and optimized by thermo-mechanical processing and/or subsequent heat treatments.read more
Citations
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Journal ArticleDOI
Mechanical Alloying of Immiscible Metallic Systems: Process, Microstructure, and Mechanism
Cijun Shuai,Cijun Shuai,Chongxian He,Shuping Peng,Fangwei Qi,Guoyong Wang,Anjie Min,Wenjing Yang,Weiguo Wang +8 more
Journal ArticleDOI
High-density deformation nanotwin induced significant improvement in the plasticity of polycrystalline γ-TiAl-based intermetallic alloys.
TL;DR: This strategy to realize high strength and high plasticity simultaneously in Cr-rich γ-TiAl-based intermetallic alloys via introducing high-density deformation nanotwins through introducing twinning deformation mechanism can be applied to other brittle alloys with a favorable twinningDeformation mechanism.
Journal ArticleDOI
High-temperature sliding wear behavior of an intermetallic γ–based TiAl alloy
TL;DR: In this paper, the high-temperature sliding wear behavior of the γ-based TiAl alloy TNM-B1 was investigated using a pin-on-disk apparatus up to 800°C in air under variation of the counterpart material.
Journal ArticleDOI
Microstructural evolution and mechanical properties of vacuum brazed Ti 2 AlNb alloy and Ti60 alloy with Cu75 P t filler metal
TL;DR: In this paper, the effects of brazing temperature on the interfacial microstructure and mechanical properties of the Ti60/Cu75 P/t/Ti2AlNb brazed joints were investigated.
Journal ArticleDOI
The Directional Solidification, Microstructural Characterization and Deformation Behavior of β-Solidifying TiAl Alloy
TL;DR: The bulging of the γ phase boundaries, the decomposition of α2 lamellae and the disappearance of γ/γ interfaces were considered as the main coarsening mechanisms of the lamellar microstructure.
References
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Journal ArticleDOI
Microstructural design and mechanical properties of a cast and heat-treated intermetallic multi-phase γ-TiAl based alloy
Emanuel Schwaighofer,Helmut Clemens,Svea Mayer,Janny Lindemann,Joachim Klose,Wilfried Smarsly,Volker Güther +6 more
TL;DR: In this article, the effect of phase transformations and chemical driving forces due to phase imbalances between different heat treatment steps and compares the mechanical properties to those obtained for forged and heat-treated material.
Journal ArticleDOI
Evolution of the ωo phase in a β-stabilized multi-phase TiAl alloy and its effect on hardness
Martin Schloffer,Boryana Rashkova,Thomas Schöberl,Emanuel Schwaighofer,Zaoli Zhang,Helmut Clemens,Svea Mayer +6 more
TL;DR: In this paper, high-energy X-ray diffraction experiments were conducted to investigate the decomposition behaviour of the ωo phase during heating as well as to determine its dissolution temperature.
Journal ArticleDOI
Technology and mechanical properties of advanced γ-TiAl based alloys
TL;DR: In this paper, the authors summarized their progress in establishing a novel production technology for -TiAl components to be used in advanced aircraft engines, where the main emphasis is on the development of a new production technology.
Journal ArticleDOI
Investment casting technology for production of TiAl low pressure turbine blades – Process engineering and parameter analysis
TL;DR: In this paper, a dependable and reproducible series production route for low pressure turbine blades made from intermetallic titanium aluminide alloys for aero-engine applications in lengths between 200 and 400mm is presented.
Journal ArticleDOI
Application of TiAl in a Turbocharger for Passenger Vehicles
TL;DR: In this article, the first commercial application of TiAl in a turbocharger for passenger vehicles is described, where the applied stress is in proportion to the weight of the vehicle.
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