Abstract
The steady-state creep behavior of NiAl was studied by constant strain-rate tests in the strain-rate regime 1.5 × 10−4≤ ɛ̇ ≤ 1.0 × 10−2 s−1.Primary creep of NiAl was investigated at different stresses (10 MPa−40 MPa) in the temperature range from 1200 to 1400°C. The steady-state creep rate was fitted to a temperature-compensated power-law expression ɛ̇ = B(σ/μ)n exp(−Q/RT), from which a stress exponent n≈3.5 and an activation energy Q ≈ 398 kJ/mol were derived, respectively. The obtained activation parameters indicate that dislocation creep dominates the creep behavior of NiAl at temperatures above 1200°C up to 1400°C. The transient creep behavior at 40 MPa could be fitted to a power-law equation ε = ε0 + btm with b α σ3:5 and 0.52<m<0.68. The creep data of NiAl obtained in this study were utilized for modeling and simulation of the consolidation process of NiAl composites during hot pressing by finite-element analysis.
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The authors would like to thank T. Burlet for help with the experiments and M. Loeck for assistance with the simulations. Financial support from the Deutsche Forschungsgemeinschaft through the collaborative research center SFB561: “Thermally highly loaded porous and cooled Multi-Layer Systems for Combined Cycle Power Plants” is gratefully acknowledged.
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© 2004 Carl Hanser Verlag, München
Artikel in diesem Heft
- Frontmatter
- Editorial
- Editorial
- Werner-Köster-Preis
- den Werner-Köster-Preis 2003
- Festabend zum 85. Geburtstag der DGM
- Festabend zum 85. Geburtstag der DGM
- Articles Applied
- NiAl – material for the application in gas turbines
- High-temperature creep behavior and hot-pressing consolidation of NiAl
- Direct Strip Casting of Magnesium
- Thermo-mechanical analysis of cast/mould interaction in casting processes
- Aluminum–Lithium alloy development for thixoforming
- On the influence of heavy warm reduction on the microstructure and mechanical properties of a medium-carbon ferritic –pearlitic steel
- Thermodynamic assessment of the Dy–Mg system
- Influence of pre-straining on mechanical properties of HSLA steel by using ball indentation technique
- Fabrication and application of co-continuous Al2O3/Al composite by reactive infiltration of molten Al into the preform of SiO2 with cordierite addition
- Articles Basic
- Simulation of cellular-dendritic solidification structures of binary alloys in three-dimensional growth using a multiparticle diffusion-limited aggregation model
- Microstructure and age-hardening effects of aluminium alloys with additions of scandium and zirconium
- Notifications / Mitteilungen
- Personal/Personelles
- Materials Week
- News/Aktuelles
- Books/Bücher
- Conferences / Konferenzen
Artikel in diesem Heft
- Frontmatter
- Editorial
- Editorial
- Werner-Köster-Preis
- den Werner-Köster-Preis 2003
- Festabend zum 85. Geburtstag der DGM
- Festabend zum 85. Geburtstag der DGM
- Articles Applied
- NiAl – material for the application in gas turbines
- High-temperature creep behavior and hot-pressing consolidation of NiAl
- Direct Strip Casting of Magnesium
- Thermo-mechanical analysis of cast/mould interaction in casting processes
- Aluminum–Lithium alloy development for thixoforming
- On the influence of heavy warm reduction on the microstructure and mechanical properties of a medium-carbon ferritic –pearlitic steel
- Thermodynamic assessment of the Dy–Mg system
- Influence of pre-straining on mechanical properties of HSLA steel by using ball indentation technique
- Fabrication and application of co-continuous Al2O3/Al composite by reactive infiltration of molten Al into the preform of SiO2 with cordierite addition
- Articles Basic
- Simulation of cellular-dendritic solidification structures of binary alloys in three-dimensional growth using a multiparticle diffusion-limited aggregation model
- Microstructure and age-hardening effects of aluminium alloys with additions of scandium and zirconium
- Notifications / Mitteilungen
- Personal/Personelles
- Materials Week
- News/Aktuelles
- Books/Bücher
- Conferences / Konferenzen