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A new interpretation of flow-stress measurements of high-purity NiAl below room temperature

  • D. Brunner EMAIL logo and P. Gumbsch
Published/Copyright: December 7, 2021
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 93 Issue 7

Abstract

The temperature and strain-rate dependence of the critical resolved shear stress (CRSS) of high-purity NiAl single crystals in soft orientation (tensile axis near 〈111〉) was measured in tensile tests with constant strain rate, ε˙ p = 10–4 s–1, between 77 and 325 K. After pre-straining at room temperature, the crystals were plastically deformed by strain increments of Δεp ≈ 0.005 at successively decreasing temperatures. Below 325 K the CRSS on the 〈001〉{011} slip system slowly increases with decreasing temperature, followed by a steeper increase below about 200 K. The strain-rate sensitivity of the CRSS measured by stress-relaxation experiments exhibits comparable behaviour. The parameters for thermally activated dislocation motion, activation volume and activation energy, suggest that different mechanisms control the dislocation motion above and below 200 K. For low stresses, at temperatures above 200 K, an interpretation of the results within the framework of solid solution hardening theory is suggested. Below 200 K the results can be interpreted within the framework of the line-tension model of the kink-pair theory of flow stress. The evaluation of the data yields a kink-pair energy of 2Hk = 0.42 eV, a Peierls stress of 535 MPa, and a Peierls valley distance equal to the lattice constant. These data are generally compatible with a fundamental process of kink-pair formation on {110} or on {100} planes. The results are discussed with respect to recent atomistic modelling of dislocations in NiAl.

Abstract

Die Temperatur- und Geschwindigkeitsabhängigkeit der kritischen Schubspannung (KSS) hochreiner NiAl-Einkristalle in weicher Orientierung (Zugachse nahe 〈111〉) wurde im Zugversuch mit konstanter Dehnrate, ε˙p= 10–4 s–1, zwischen 77 und 325 K gemessen. Nach Vorverformung bei Raumtemperatur wurden die Kristalle in Dehnungsintervallen von Δεp = 0.005 bei sukzessiv aufeinanderfolgenden abnehmenden Temperaturen verformt. Unterhalb 325 K nimmt die für ein 〈001〉{011}-Gleitsystem berechnete KSS langsam mit abnehmender Temperatur zu. Unterhalb ≈200 K erfolgt dann ein starker Anstieg. Die Geschwindigkeitsempfindlichkeit der KSS, gemessen mittels Spannungsrelaxationsexperimenten, zeigt ein vergleichbares Verhalten. Die Parameter für die thermisch aktivierte Versetzungsbewegung (Aktivierungsenergie und Aktivierungsvolumen) legen nahe, dass verschiedene Mechanismen die Versetzungsbewegung oberhalb und unterhalb 200 K bestimmen. Für niedrige Spannungen, bei Temperaturen oberhalb 200 K, lassen sich die Ergebnisse gut im Rahmen der Mischkristallhärtung beschreiben. Unterhalb 200 K lassen sich die Ergebnisse im Rahmen des Linienspannungsmodells der Kinkpaartheorie der KSS beschreiben. Dabei ergibt die Auswertung der Daten eine Kinkpaarenergie 2Hk = 0.42 eV, eine Peierlsspannung von 535 MPa und einen Peierlstalabstand von der Größe der Gitterkonstanten. Diese Ergebnisse sind verträglich mit einer Kinkpaarbildung auf {110}- oder {100}-Ebenen. Die Resultate werden auf der Grundlage jüngerer atomistischer Modellierungen von Versetzungen in NiAl diskutiert.

Keywords: NiAl single crystal; Solid solution hardening theory; Kink-pair theory; Thermal activation; Dislocation motion
Dr. Dieter Brunner Max-Planck-Institut für Metallforschung Heisenbergstr. 3, 70569 Stuttgart, Germany Tel.: +49 711 689 3615 Fax: +49 711 689 3522

  1. The authors would like to thank R. Henes and his group for preparing NiAl single crystals, and I. Lakemeyer for specimen preparation, assistance of the measurements, and in the evaluation of the data. Also, they are indebted to Prof. W. Skrotzki (Technische Universität Dresden, Germany) for valuable comments.

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Erhalten: 2002-03-14
Online erschienen: 2021-12-07

© 2002 Carl Hanser Verlag, München

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  1. Frontmatter
  2. Editorial
  3. Editorial
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  16. A new interpretation of flow-stress measurements of high-purity NiAl below room temperature
  17. A mesoscopic plasticity model accounting for spatial fluctuations of plastic strains, internal stresses and dislocation densities
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  19. Dislocation structure and crystallite size distribution in hexagonal nanomaterials from X-ray peak profile analysis
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  29. Notifications/Mitteilungen
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  32. DGM Conferences/Training
https://doi.org/10.3139/ijmr-2002-0114
Keywords for this article
NiAl single crystal; Solid solution hardening theory; Kink-pair theory; Thermal activation; Dislocation motion

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Articles/Aufsätze
  5. A model for the work hardening of WC–Co “hard metals”
  6. On the dispersion strengthening mechanisms in ODS materials
  7. Effect of hydrogen on the mechanical properties of the β titanium alloy Timetal® 21S
  8. Cyclic deformation behaviour of (α + β) titanium alloys under complex mechanical and physiological loading conditions
  9. Assessment of the influence of interdendritic shrinkage cavities on the thermo-mechanical fatigue behaviour of the nickel-base superalloy MAR-M247LC
  10. Effects of static strain aging on residual stress stability and alternating bending strength of shot peened AISI 4140
  11. On the possibilities to enhance the fatigue properties of ultrafine-grained metals
  12. New method of determining stress relaxation behavior in creep machines by controlled unloading
  13. Creep of binary Ni-rich NiTi shape memory alloys and the influence of pre-creep on martensitic transformations
  14. Interaction of high-cycle fatigue with high-temperature creep in superalloy single crystals
  15. A unified description of creep in pure and dispersion-strengthened copper
  16. A new interpretation of flow-stress measurements of high-purity NiAl below room temperature
  17. A mesoscopic plasticity model accounting for spatial fluctuations of plastic strains, internal stresses and dislocation densities
  18. Behavior of X-ray peak widths in the Wilkens model of a restrictedly random distribution of dislocations
  19. Dislocation structure and crystallite size distribution in hexagonal nanomaterials from X-ray peak profile analysis
  20. Werden gewichtsoptimiert konstruierte Bauteile durch die Verwendung von Leichtmetallen wirklich leichter?*)
  21. Strain-induced martensite formation in metastable austenitic steels with varying carbon content
  22. Isothermal bainitic transformation in low alloy steels: factors limiting prediction of the resulting material’s properties
  23. Fatigue damage evolution in a particulate-reinforced metal matrix composite determined by acoustic emission and compliance method
  24. Microstructure and modification mechanisms of Si phase in as-thixoformed alloy A356
  25. Influence of size effect on microstructural changes in cyclically deformed polycrystalline nickel
  26. Self-diffusion of 71Ge and 31Si in Si –Ge alloys
  27. On localised corrosive attack, stress corrosion cracking and corrosion fatigue effects in a hardmetal cutting-tool material
  28. The internal stress during growth of SiC single crystals
  29. Notifications/Mitteilungen
  30. Personal/Personelles
  31. Books/Bücher
  32. DGM Conferences/Training
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