Processing, Properties and Applications of Gamma Titanium Aluminide Sheet and Foil Materials

1996 ◽  
Vol 460 ◽  
Author(s):  
H. Clemens ◽  
W. Glatz ◽  
N. Eberhardt ◽  
H.-P. Martinz ◽  
W. Knabl
Keyword(s):  
Mechanical Properties ◽  
Titanium Aluminide ◽  
Alloy Composition ◽  
Protective Coatings ◽  
Sheet Material ◽  
Superplastic Forming ◽  
Rolling Process ◽  
Processing Route ◽  
Gamma Titanium Aluminide ◽  
Sheet Rolling

ABSTRACTIntermetallic γ-TiAl based alloys (”γ-alloys”) have a great potential to become important materials for advanced applications in aerospace, automotive and related industries. Research and development on γ-alloys have progressed significantly within the last decade. This research has led to a better understanding of the fundamental correlations between alloy composition and microstructure, processing behaviour and mechanical properties. This paper describes the progress in sheet rolling of γ-TiAl based alloys on industrial scale. Employing an advanced hot-rolling process sheets with lengths >1000 mm have been rolled. Furthermore, first results of foil rolling are presented. The mechanical properties of γ-TiAl sheet material with regard to processing route, alloy composition and microstructure are summarized and discussed. Sheet forming by means of superplastic forming and conventional metal forming techniques has successfully been conducted. Different joining techniques have been studied for γ-alloys including solid-state diffusion bonding. The oxidation resistance of γ-alloys is higher than that of Ti-alloys, however, for long-term applications at temperatures >700°C the need for reliable oxidation protective coatings is anticipated. Recent results of cyclic oxidation tests on coated γ-TiAl sheet are presented. Finally, the results of a stability test conducted on a γ-TiAl panel at 750°C are summarized.

Extrusion of AZ31 Magnesium Sheet

2010 ◽  
Vol 638-642 ◽  
pp. 1530-1535 ◽  
Author(s):  
Sven Gall ◽  
Sören Müller ◽  
Walter Reimers
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Deformation Behavior ◽  
Sheet Material ◽  
Processing Route ◽  
Rolled Sheet ◽  
X Ray ◽  
Magnesium Alloy Az31 ◽  
Increasing Demand

Due to the increasing demand of deep drawing applications for magnesium alloys in the future magnesium sheets with good mechanical and forming properties are required. These properties depend on the processing route of the sheet material. The deformation behavior of magnesium alloys is strongly influenced by the texture. Extruded magnesium sheets exhibit a different texture than rolled magnesium sheets. Therefore, the forming properties of the extruded magnesium sheets are supposed to be different compared to rolled sheets. Thin extrusion of the magnesium alloy AZ31 with a thickness of 1.5 and 2 mm were performed. Adjacent the extruded sheets were tested for their microstructure, texture and mechanical properties. The texture stability and evolution after the rolling of extruded magnesium sheets were investigated. Thus some of the 1.5 mm sheets were rolled to 1.0 mm and analyzed by OIM, X-Ray and mechanical testing. Concluding the results were compared to the properties of the just extruded 1.5 mm sheet and conventionally rolled sheet of 1 mm thickness.

Tensile Properties and Deformation Mechanisms in Two-Phase Titanium Aluminide Sheet Material

1996 ◽  
Vol 460 ◽  
Author(s):  
F. Appel ◽  
H. Clemens ◽  
W. Glatz ◽  
R. Wagner
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Tensile Properties ◽  
Deformation Behavior ◽  
Titanium Aluminide ◽  
Elevated Temperatures ◽  
Sheet Material ◽  
Deformation Mechanisms ◽  
Structural Components ◽  
Two Phase

ABSTRACTThe mechanical properties of two-phase TiAl sheets with different compositions and microstructures were investigated over the temperature range 25–1000 °C. The microprocesses of plasticity were characterized by electron microscope observations. Particular emphasis has been paid to the mechanisms governing the deformation behavior at elevated temperatures which are relevant for the fabrication and engineering applications of structural components.

Production of Ti-6Al-4V Sheets for Low Temperature Superplastic Forming

2007 ◽  
Vol 551-552 ◽  
pp. 31-36 ◽  
Author(s):  
Gennady A. Salishchev ◽  
Oleg R. Valiakhmetov ◽  
Werner Beck ◽  
F.H. Froes
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Low Temperature ◽  
Sheet Material ◽  
Superplastic Forming ◽  
Sheet Plane ◽  
Initial Flow ◽  
Average Grain Size ◽  
Superplastic Properties ◽  
Commercial Size

The availability to produce Ti-6Al-4V sheet material with submicron-grained microstructure for superplastic forming (SPF) has been studied. The laboratory scale sheets with an average grain size of 0.3 μm and the commercial size sheets with an average grain size of 0.65 μm were produced by pack rolling manufacturing technique from the forgings with pre-formed submicrocrystalline (SMC) structure. The sheets possessing isotropic mechanical properties in the sheet plane had higher yield strength, ultimate tensile strength. Over the exceptionally low temperature range of 700-750°C the SMC sheets demonstrated enhanced superplastic properties, namely an initial flow stress of 20-25 MPa and elongation more than 600% at the strain rate of 3×10-4/s. The sheet material with SMC structure was characterized by well formability compared to a conventional sheet under low temperature superplastic conditions.

Production of Nanostructure in Titanium by Cold Rolling

2008 ◽  
Vol 584-586 ◽  
pp. 759-764 ◽  
Author(s):  
Svetlana Malysheva ◽  
G.A. Salishchev ◽  
Sergey Mironov ◽  
Sergey V. Zherebtsov
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Grain Size ◽  
Severe Plastic Deformation ◽  
Cold Rolling ◽  
Sheet Material ◽  
Coarse Grained ◽  
Sheet Rolling ◽  
Commercial Titanium ◽  
High Level

The paper considers changes in microstructure, texture and mechanical properties of commercial titanium with initial coarse-grained structure during cold sheet rolling. It has been shown that rolling above 75% leads to formation of a uniform nanocrystalline (NC) structure with a grain size of approximately 0.2 'm in the sheet material. The sheets have a high level of mechanical properties which is comparable with the properties of bulk specimens of titanium with NC structure produced by some other method of severe plastic deformation.

Gamma Titanium Aluminides Behavior at High Temperature Static Short-Term Stress

2014 ◽  
Vol 657 ◽  
pp. 407-411
Author(s):  
Elvira Alexandrescu ◽  
Alexandra Banu ◽  
Mihai Trifănescu ◽  
Alexandru Paraschiv
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
High Temperatures ◽  
Titanium Aluminide ◽  
Titanium Aluminides ◽  
Dynamic Testing ◽  
Protective Coatings ◽  
Testing Machine ◽  
High Yield ◽  
Short Term

Today conventional titanium-based alloys represent one third of the weight of modern aircraft engines and, are the second most used engine material following Ni-based superalloys. [1] Titanium aluminide alloys based on intermetallic phases γ (TiAl) and α2 (Ti3Al) and the most recent – orthorhombic titanium aluminide, are widely recognized as having the potential to meet the design requirements for high temperature applications. The outstanding thermo-physical and mechanical properties of these materials rely mainly on the strongly ordered nature and the directional bonding of the compounds. These involve: high melting point, above 1460°C, low density of 3,9-5 g/cm3, according the alloying degree, high elastic modulus (high stiffness), high yield strength and good creep resistance at high temperature, low diffusion coefficient, good structural stability at high temperature. The main objective of our paper are focussed on the short-term mechanical properties if Titanium niobium aluminide at 850°C. High temperatures mechanical properties evaluation was performed by tensile testing at temperature of 850°C on universal static and dynamic testing machine Instron 8802, equipped with high temperature system, for maximum 1000°C, and extensometer with a measuring basis of 40 mm. The mechanical tensile test was performed according the ASTM E8, with control of deformation and a testing rate of 10-4 mmsec.-1. Short-term behavior request of the support uncovered alloys, at 850°C has proved to be modest and it seems obvious that the alloys based on titanium aluminides cannot be used without protective coatings. Key words: titanium aluminides, high temperatures, mechanical properties

scholarly journals Asymmetric (Hot, Warm, Cold, Cryo) Rolling of Light Alloys: A Review

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 956
Author(s):  
Denis Pustovoytov ◽  
Alexander Pesin ◽  
Puneet Tandon
Keyword(s):  
Mechanical Properties ◽  
Deformation Zone ◽  
Large Scale ◽  
Rolling Force ◽  
Vertical Plane ◽  
Relevant Information ◽  
Rolling Process ◽  
Technological Parameters ◽  
Asymmetric Rolling ◽  
Sheet Rolling

Asymmetric sheet rolling is a process used when there are differences in any technological parameters in the horizontal plane across the width of the deformation zone or in the vertical plane between the top and bottom surfaces of the deformation zone. Asymmetry can either have random causes, or it can be created purposefully to reduce rolling force, improve sheet flatness, minimize the ski effect, obtain thinner sheets and for grain refinement and improvement of texture and mechanical properties of sheet metals and alloys. The purpose of this review is to analyze and summarize the most relevant information regarding the asymmetric (hot, warm, cold, cryo) rolling processes in terms of the effect of purposefully created asymmetry on grain size and mechanical properties of pure Mg, Al, Ti and their alloys. The classification and fundamentals of mechanics of the asymmetric rolling process are presented. Based on the analysis of publications related to asymmetric rolling, it was found that a superior balance of strength and ductility in pure Mg, Al, Ti and their alloys could be achieved due to this processing. It is shown that asymmetric rolling in comparison with conventional severe plastic deformation methods have an undeniable advantage in terms of the possibility of the production of large-scale sheets.

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