Influence of chemistry and microstructure on the activation volume of TiAl alloys
Autor: | Nicolas Barbi, Frédéric Diologent, Andreas Mortensen, Luc Rougier |
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Rok vydání: | 2010 |
Předmět: |
Materials science
Alloy Thermodynamics chemistry.chemical_element Titanium Aluminide Alloys Mechanical-Properties Plasticity engineering.material Flow stress Flow-Stress Stress (mechanics) Grain-Refinement Tensile Properties Materials Chemistry Gamma Phase morphology Yield stress Temperature-Dependence Yield-Stress Defects Dislocation geometry and arrangement Titanium aluminides based on TiAl Mechanical Engineering Metallurgy Metals and Alloys General Chemistry Microstructure Plastic-Deformation Single-Crystals Volume (thermodynamics) chemistry Mechanics of Materials engineering Plastic deformation mechanisms Titanium |
Zdroj: | Intermetallics. 18:2145-2153 |
ISSN: | 0966-9795 |
Popis: | Repeated stress-relaxation experiments are conducted from RT to 1073 K on three different gamma + alpha(2) TiAl alloys (Ti-46Al with 8Ta, 8Nb or 7Nb) One is a conventional duplex alloy, the two other are novel "convoluted" cast titanium aluminides developed for turbine applications The data include measurements of the flow stress and activation volume of these alloys at 293, 673, 873, 923, 1023 and 1073 K. Despite differences in composition, processing and microstructure, the values and evolution with temperature or with stress of these parameters are relatively similar for the three alloys This observation, coupled with the agreement of present results with data in the literature for similar alloys, leads to conclude that the strain-rate dependence of plastic flow in alloys of this class is governed by features of the gamma-phase that are relatively insensitive to the alpha 2 phase morphology. The convoluted alloys furthermore feature a yield stress anomaly. (C) 2010 Elsevier Ltd All rights reserved. |
Databáze: | OpenAIRE |
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