Internal Friction and Creep of Titanium Aluminides with Different Microstructure
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Manfred Weller
,
Anita Chatterjee
Abstract
ATi-46.5 Al-4 (Cr, Nb, Ta, B) alloy (at.%) with different microstructures (fine-grained primary annealed or coarsegrained fully lamellar) was examined both by mechanical-loss (internal-friction) and creep experiments. The mechanical-loss spectra (0.01– 10 Hz), ranging from 300 up to 1300 K, show two phenomena: (i) A loss peak at about 900 K (0.01 Hz) which occurs only in samples with a lamellar microstructure. The activation enthalpy, determined from the frequency shift, is 3.0 eV. The Debye-type peak is related to thermally activated reversible local movement of dislocation segments which are pinned at the lamellae interfaces and within gamma lamellae, (ii) A high-temperature damping background above 1000 K which is controlled by an activation enthalpy of 3.8 to 3.9 eV. This value agrees well with the activation enthalpy determined by creep tests and is in the range of values reported for self-diffusion of Al. These results indicate that both properties (high-temperature background and creep) are controlled by volume diffusion-assisted climb of dislocations.
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We thank Plansee Aktiengesellschaft (Reutte, Austria) for providing sample material.
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© 2001 Carl Hanser Verlag, München
Artikel in diesem Heft
- Frontmatter
- Editorial
- Günter Lange 65 Years
- Aufsätze/Articles
- Deformation and Microstructure of Titanium Chips and Workpiece
- Eigenspannungsabbau in zügig und zyklisch beanspruchten Schweißverbindungen
- Bruchmechanische Nachweise zur Stahlgütewahl für moderne Feinkornbaustähle
- Experimental Analysis of the Interaction of “Hot” and “Cold” Volume Elements during Thermal Fatigue of a Cooled Component Made from AISI 3161 Steel
- Microstructure and Cyclic Deformation Behavior of Wheel and Tire Steels in Technically Relevant Heat Treatments
- Dehnratenabhängige Beschreibung der Fließkurven für erhoöhte Temperaturen
- Ein einfaches Modell für die Kinetik der Rekristallisation
- Determination of the Elastic Modulus of Wear Resistant Coatings by Quantitative Acoustic Microscopy
- Processing, Microstructure and Properties of Nb–TiO2 ODS Materials for Surgical Implants
- Influence of Surface Treatment on the Pitting Corrosion Behaviour of High Alloyed Stainless Steels in a Chloride Solution
- Unfall durch Drahtseilriss in einer Tunnelbaustelle
- Synthesis of Nanocrystalline B2 Structured (Ru, Ir) Al in the Ternary Ru–Al–Ir System by Mechanical Alloying and its Thermal Stability
- Preparation of Ca-α-sialon Ceramics with Compositions along the Si3N4-1/2 Ca3N2:3AIN Line
- SiC–Si3N4 Nanocomposite Prepared by the Addition of SiO2 + C
- Ceramics in the Si3N4–ZrO2–CeO2 System: Phase Composition Changes and Properties
- The Al–Ca System, Part 1: Experimental Investigation of Phase Equilibria and Crystal Structures
- The Al–Ca System, Part 2: Calorimetrie Measurements and Thermodynamic Assessment
- Phase Relationships of the Gd-Zn System
- Ableitung des Kristallisationspfades in ternären Gusslegierungen
- Bildanalyse komplexer Werkstoffgefüge durch Texturanalyse und Korrelation mit den Eigenschaften durch neuronale Netze
- Grain Growth in the Nanocrystalline W–Cu and Cu–Pb Composite Powders Prepared by Mechanical Alloying
- Toughening and Strengthening Response in Ni3Al-Bonded Titanium Carbide Cermets
- Creep Behavior of γ-TiAl-Based Alloys with Fully Lamellar Microstore
- Elevated Temperature Deformation of P/M Dispersion - Strengthened Copper and Aluminium
- Evolution of the Microstructure during Hot Working of Gamma-Based TiAl Alloys
- Interface Motion of β-Silicon Nitride in a Liquid Phase
- Internal Friction and Creep of Titanium Aluminides with Different Microstructure
- Mitteilungen/Notifications
- Personen
- Conferences
Artikel in diesem Heft
- Frontmatter
- Editorial
- Günter Lange 65 Years
- Aufsätze/Articles
- Deformation and Microstructure of Titanium Chips and Workpiece
- Eigenspannungsabbau in zügig und zyklisch beanspruchten Schweißverbindungen
- Bruchmechanische Nachweise zur Stahlgütewahl für moderne Feinkornbaustähle
- Experimental Analysis of the Interaction of “Hot” and “Cold” Volume Elements during Thermal Fatigue of a Cooled Component Made from AISI 3161 Steel
- Microstructure and Cyclic Deformation Behavior of Wheel and Tire Steels in Technically Relevant Heat Treatments
- Dehnratenabhängige Beschreibung der Fließkurven für erhoöhte Temperaturen
- Ein einfaches Modell für die Kinetik der Rekristallisation
- Determination of the Elastic Modulus of Wear Resistant Coatings by Quantitative Acoustic Microscopy
- Processing, Microstructure and Properties of Nb–TiO2 ODS Materials for Surgical Implants
- Influence of Surface Treatment on the Pitting Corrosion Behaviour of High Alloyed Stainless Steels in a Chloride Solution
- Unfall durch Drahtseilriss in einer Tunnelbaustelle
- Synthesis of Nanocrystalline B2 Structured (Ru, Ir) Al in the Ternary Ru–Al–Ir System by Mechanical Alloying and its Thermal Stability
- Preparation of Ca-α-sialon Ceramics with Compositions along the Si3N4-1/2 Ca3N2:3AIN Line
- SiC–Si3N4 Nanocomposite Prepared by the Addition of SiO2 + C
- Ceramics in the Si3N4–ZrO2–CeO2 System: Phase Composition Changes and Properties
- The Al–Ca System, Part 1: Experimental Investigation of Phase Equilibria and Crystal Structures
- The Al–Ca System, Part 2: Calorimetrie Measurements and Thermodynamic Assessment
- Phase Relationships of the Gd-Zn System
- Ableitung des Kristallisationspfades in ternären Gusslegierungen
- Bildanalyse komplexer Werkstoffgefüge durch Texturanalyse und Korrelation mit den Eigenschaften durch neuronale Netze
- Grain Growth in the Nanocrystalline W–Cu and Cu–Pb Composite Powders Prepared by Mechanical Alloying
- Toughening and Strengthening Response in Ni3Al-Bonded Titanium Carbide Cermets
- Creep Behavior of γ-TiAl-Based Alloys with Fully Lamellar Microstore
- Elevated Temperature Deformation of P/M Dispersion - Strengthened Copper and Aluminium
- Evolution of the Microstructure during Hot Working of Gamma-Based TiAl Alloys
- Interface Motion of β-Silicon Nitride in a Liquid Phase
- Internal Friction and Creep of Titanium Aluminides with Different Microstructure
- Mitteilungen/Notifications
- Personen
- Conferences
