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High-temperature creep behavior and hot-pressing consolidation of NiAl

  • Hao Chen , Weiping Hu , Yunlong Zhong and Günter Gottstein EMAIL logo
Published/Copyright: February 10, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 95 Issue 12

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.

Keywords: NiAl; Creep; Hot pressing
Prof. Dr. G. Gottstein RWTH Aachen Institut für Metallkunde und MetallphysikKopernikusstr. 14, D-52056 Aachen, Germany Tel.: +49 241 80 26860 Fax: +49 241 80-22608

Dedicated to Prof. Dr.-Ing. Dr. h. c. mult. Reiner Kopp on the occasion of his 65th birthday

  1. 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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Received: 2004-06-30
Accepted: 2004-09-15
Published Online: 2022-02-10

© 2004 Carl Hanser Verlag, München

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https://doi.org/10.1515/ijmr-2004-0197
Keywords for this article
NiAl; Creep; Hot pressing

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Werner-Köster-Preis
  5. den Werner-Köster-Preis 2003
  6. Festabend zum 85. Geburtstag der DGM
  7. Festabend zum 85. Geburtstag der DGM
  8. Articles Applied
  9. NiAl – material for the application in gas turbines
  10. High-temperature creep behavior and hot-pressing consolidation of NiAl
  11. Direct Strip Casting of Magnesium
  12. Thermo-mechanical analysis of cast/mould interaction in casting processes
  13. Aluminum–Lithium alloy development for thixoforming
  14. On the influence of heavy warm reduction on the microstructure and mechanical properties of a medium-carbon ferritic –pearlitic steel
  15. Thermodynamic assessment of the Dy–Mg system
  16. Influence of pre-straining on mechanical properties of HSLA steel by using ball indentation technique
  17. Fabrication and application of co-continuous Al2O3/Al composite by reactive infiltration of molten Al into the preform of SiO2 with cordierite addition
  18. Articles Basic
  19. Simulation of cellular-dendritic solidification structures of binary alloys in three-dimensional growth using a multiparticle diffusion-limited aggregation model
  20. Microstructure and age-hardening effects of aluminium alloys with additions of scandium and zirconium
  21. Notifications / Mitteilungen
  22. Personal/Personelles
  23. Materials Week
  24. News/Aktuelles
  25. Books/Bücher
  26. Conferences / Konferenzen
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