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Formation of Nanocrystalline Phases during Decomposition of Amorphous Ni–P Alloys by Continuous Linear Heating

  • Ádám Révész , János Lendvai , Ágnes Cziráki , Howard H. Liebermann and Imre Bakonyi EMAIL logo
Published/Copyright: January 7, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 92 Issue 5

Abstract

Differential scanning calorimetry (DSC), powder diffraction and high-resolution X-ray diffraction (XRD), and transmission electron microscopy (TEM) investigations have been performed on melt-quenched amorphous Ni–P alloys with compositions of 18 to 22 at.% P. The calorimetric results revealed different crystallization routes during linear heating below, at and above the eutectic point (19 at.% P) but with the same general transformation scheme as reported previously for electrodeposited and electroless Ni–P amorphous alloys. The composition dependence of the activation energy of the crystallization and the heats evolved during the structural transformations were determined from DSC measurements. The average grain size was derived from XRD line broadening and inportant imformation on the crystallization products and their microstructure could be revealed also from the TEM studies. All these findings will have special significance when analysing the results of isothermal annealing experiments to be described in a forthcoming paper.

Abstract

DSC-Messungen, pulver- und hochauflösende röntgenographische sowie TEM-Untersuchungen wurden an schmelzgesponnenen amorphen Ni–P-Legierungen (18 bis 22 At.% P) durchgeführt. Es konnte mit Hilfe der kalorimetrischen Messungen festgestellt werden, dass der Kristallisationsvorgang von der Legierungszusammensetzung abhängt, obwohl die Kristallisationssequenz im Allgemeinen dieselbe war, wie früher für elektrolytische und stromlos abgeschiedene amorphe Ni–P-Legierungen beobachtet wurde. Die Abhängigkeit der Aktivierungsenergie der Kristallisation und der Kristallisationsenthalpie vom P-Gehalt wurde aus den DSC-Messungen bestimmt. Aus der Verbreiterung der Röntgenbeugungslinien wurde die Korngröße bestimmt. TEM-Untersuchungen haben weitere wichtige Informationen über die Kristallisationsprodukte sowie über die Mikrostruktur der entstandenen nanokristallinen Phasen geliefert. Diese Ergebnisse haben eine besondere Bedeutung für die Auswertung von ähnlichen Messungen an denselben amorphen Legierungen nach isothermen Wärmebehandlungen, die in einer weiteren Arbeit beschrieben werden sollen.

Keywords: Decomposition of amorphous Ni –P alloys; Amorphous Ni –P alloys; Nanocrystalline phases
I. Bakonyi Research Institute for Solid State Physics and Optics Hungarian Academy of Sciences H-1525 Budapest, P. O. Box 49, Hungary Fax: +36 1 392 2215

  1. This work has been supported by the Hungarian Scientific Research Fund (OTKA) under grants No. T 022124, T 022968 and 29701. The powder diffraction work has been performed on an apparatus purchased by the Eötvös University under grant CEF 1156.

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Received: 2000-12-12
Published Online: 2022-01-07

© 2001 Carl Hanser Verlag, München

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  15. Formation of Nanocrystalline Phases during Decomposition of Amorphous Ni–P Alloys by Continuous Linear Heating
  16. Lattice Parameters of Metastable Structures in Quenched Fe-Mn Alloys. Part II: hcp Phase
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  19. Mitteilungen/Notifications
  20. Personen
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https://doi.org/10.3139/ijmr-2001-0095
Keywords for this article
Decomposition of amorphous Ni –P alloys; Amorphous Ni –P alloys; Nanocrystalline phases

Articles in the same Issue

  1. Contents
  2. Aufsätze/Articles
  3. Electron Back Scatter Diffraction and Synchrotron X-Ray Peak Profile Analysis as Tools for Microstructural Characterization of Large Strain Work Hardened Metals
  4. Influences of Material Inhomogeneities in 100Cr6 Steel on the Electrochemical Metal Dissolution Process
  5. An Investigation on Cold Roll Welding of Copper to Aluminum Using Electrical Resistivity
  6. Effect of Forced Convection by Accelerating Crucible Rotation on Directional Solidification
  7. Phase Transformation Behaviour and Microstructure of Ti51Pd30Ni19 Alloy
  8. Experimental Study and Reassessment of the Ni–Hf Binary System
  9. AThermodynamic Assessment of the Pr–Al System
  10. Phase Diagram and Thermodynamic Properties of the Tl – In – Te System
  11. The Excess Enthalpies of Liquid In–Bi–Te and Sb–Bi–Te Alloys
  12. Thermodynamic Evaluation of Binary Phase Diagrams of Small Particle Systems
  13. On the Hot Workability of ELI Grade Titanium Alloy Ti–6Al–4V
  14. Revelation of Anomalous Creep of the Cu–30 mass% Zn Alloy Related with Dislocation Hardening under High-Temperature Creep Deformation
  15. Formation of Nanocrystalline Phases during Decomposition of Amorphous Ni–P Alloys by Continuous Linear Heating
  16. Lattice Parameters of Metastable Structures in Quenched Fe-Mn Alloys. Part II: hcp Phase
  17. Einfluss dynamischer Reckalterung auf Lebensdauer und Mikrostruktur bei zyklischer Beanspruchung von X22CrMoV121
  18. Development of SMD 32.768 kHz Tuning Fork-Type Crystals Using Photolithography and Selective Etching Process
  19. Mitteilungen/Notifications
  20. Personen
  21. Mitteilungen
  22. Bücher
  23. Tagungen
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