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Calorimetric Determination of the Enthalpy of Formation and the Description of the Constitutional Defects of the Ordered (Ni, Co)1–y Aly, Phase

  • Axel Grün , Ernst-Theo Henig and Ferdinand Sommer
Published/Copyright: January 3, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 89 Issue 9

Abstract

The enthalpy of formation of the ordered phase (NixCo1–x)0.50Al0.50, (NixCo1–x)0.58Al0.42 with (0 ≤ x ≤ 1) and Ni0.30Co0.15Al0.55 with the B2 (CsCl) structure was measured by differential solution calorimetry at 1073 K as a function of composition in order to describe the constitutional defects. The binary Ni0.50Al0.50-phase exhibits the most negative enthalpy of formation (–71.27 kJ mol–1). The absolute value of the enthalpy of formation decreases by substituting nickel for cobalt with constant aluminium content. The composition dependence of the enthalpy of formation can be described by the disorder model of Wagner and Schottky. The model provides information about the composition dependence of the concentration of the existing defects (vacancy, antistructure atom) of the ordered ternary phases.

Abstract

Zur thermodynamischen Beschreibung der konstitutionellen Fehlstellen der geordneten Phase (NixCo1–x )0,50A10,50, (NixCo1–x)0,58Al0,42 mit 0 ≤ x ≤ 1 und Ni0,30Co0,15 Al0,55 mit einer B2-(CsCl)-Struktur wurde ihre Bildungsenthalpie mit einem Differential-Lösungskalorimeter bei 1073 K als Funktion der Zusammensetzung gemessen. Die binäre Ni0,50Al0,50-Phase besitzt mit –71,27 kJ mol–1 die größte negative Bildungsenthalpie. Die Substitution von Nickel durch Kobalt bei konstant gehaltenem Aluminiumgehalt bewirkt im gesamten Homogenitätsbereich der ternären Phase eine Abnahme des Betrags der Bildungsenthalpie. Der Verlauf der Bildungsenthalpie wird sehr gut durch das Fehlordnungsmodell von Wagner und Schottky beschrieben. Das Modell ermöglicht Aussagen über die Konzentration der auftretenden Fehlstellen (Leerstelle, Antistrukturatom) in Abhängigkeit von der Zusammensetzung der geordneten ternären Phase.

A. Grün, E.-Th. Henig, F. Sommer Max-Planck-Institut für Metallforschung Seestr. 92 D-70174 Stuttgart Germany

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Received: 1998-02-04
Published Online: 2022-01-03

© 1998 Carl Hanser Verlag, München

Articles in the same Issue

  1. Frontmatter
  2. Aufsätze
  3. Tracer Grain Boundary Diffusion of Silver in α-Zirconium Polycrystals
  4. Calorimetric Determination of the Enthalpy of Formation and the Description of the Constitutional Defects of the Ordered (Ni, Co)1–y Aly, Phase
  5. A Conceptual Modelling of the Tetragonality of L10 (AuCu-I type) Intermetallics
  6. Phase Stability of Hard Alpha in Ti-64 and Ti-17
  7. Phase Diagram Investigation of the Indium-Selenium System
  8. Evaluation of Five-component Phase Diagrams for the Analysis of Phase Composition in Al–Si Based Alloys
  9. The Formation of Interface Phases in the Diffusion Couple Ti–SiC
  10. Deformation Behavior of a Modified 9Cr–1Mo Steel Between 77 and 373 K
  11. The Strength of Ferrite in Annealed Armco Iron and Hypoeutectoid Steels
  12. Notched Strength of Fabric Composite Plates with a Circular Hole
  13. Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V.
  14. Personen
  15. Veranstaltungen
  16. Buchbesprechung
https://doi.org/10.3139/ijmr-1998-0113

Articles in the same Issue

  1. Frontmatter
  2. Aufsätze
  3. Tracer Grain Boundary Diffusion of Silver in α-Zirconium Polycrystals
  4. Calorimetric Determination of the Enthalpy of Formation and the Description of the Constitutional Defects of the Ordered (Ni, Co)1–y Aly, Phase
  5. A Conceptual Modelling of the Tetragonality of L10 (AuCu-I type) Intermetallics
  6. Phase Stability of Hard Alpha in Ti-64 and Ti-17
  7. Phase Diagram Investigation of the Indium-Selenium System
  8. Evaluation of Five-component Phase Diagrams for the Analysis of Phase Composition in Al–Si Based Alloys
  9. The Formation of Interface Phases in the Diffusion Couple Ti–SiC
  10. Deformation Behavior of a Modified 9Cr–1Mo Steel Between 77 and 373 K
  11. The Strength of Ferrite in Annealed Armco Iron and Hypoeutectoid Steels
  12. Notched Strength of Fabric Composite Plates with a Circular Hole
  13. Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V.
  14. Personen
  15. Veranstaltungen
  16. Buchbesprechung
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