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A thermodynamic description of the B–Co system: modeling and experiment

  • Yong Du EMAIL logo , Julius Clemens Schuster , Y. Austin Chang , Zhanpeng Jin and Baiyun Huang
Published/Copyright: February 9, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 93 Issue 11

Abstract

The B–Co system is investigated via thermodynamic modeling and experiments. In the modeling section, all of the experimental phase diagram and thermodynamic data available from the literature were critically reviewed and assessed by using thermodynamic models for the Gibbs energies of individual phases. In the experimental section, 6 key alloys were prepared by arc melting Co slug and B pieces and annealing at 900 °C for 9 days. Water-quenched samples were analysed by using X-ray diffraction, optical microscopy, electron probe microanalysis and differential thermal analysis techniques. The measured invariant reaction temperatures are: 1136 ± 2 °C for Liquid (L) ↔ (αCo) + Co3B, 1157 ± 2 °C for L + Co2B ↔ Co3B, 1263 ± 2 °C for L ↔ Co2B + CoB, and 1358 ± 2 °C for L ↔ CoB + B. A consistent thermodynamic data set for the B–Co system is finally obtained by considering the present experimental results and reliable literature data. Comparisons between the calculated and measured phase diagram and thermodynamic quantities show that all of the accurate experimental information is satisfactorily accounted for by the thermodynamic description.

Abstract

Das System B–Co wurde mittels experimenteller Messungen und thermodynamischer Modellierung untersucht. Alle in der Literatur verfügbaren experimentellen thermodynamischen und Phasendiagramm-Daten wurden kritisch durchgesehen und mittels thermodynamischer Modelle für die freie Enthalpie bewertet. Danach wurden 6 charakteristische Legierungen aus Co und B im Lichtbogen erschmolzen und bei 900 °C 9 Tage lang geglüht. Die in Wasser abgeschreckten Proben wurden mit Röntgenbeugung, Licht- und Elektronenmikroskopie sowie Differenzialthermoanalyse untersucht. Es wurden folgende invarianten Temperaturen beobachtet: 1136 ± 2 °C für Schmelze (L) ↔ αCo + Co3B, 1157 ± 2 °C für L + Co2B ↔ Co3B, 1263 ± 2 °C für L Co2B + Co3B, und 1358 ± 2 °C für L ↔ CoB + B. Mit diesen Ergebnissen sowie als verlässlich befundenen Literaturdaten wurde ein konsistenter Satz thermodynamischer Daten für das System B–Co erhalten. Der Vergleich von berechneten und beobachteten Phasendiagrammen und thermodynamischen Daten zeigt, dass sämtliche experimentelle Informationen durch diese thermodynamische Modellierung zufriedenstellend beschrieben werden.

Keywords: Phase diagram B–Co; X-ray diffraction; Thermal analysis; Electron probe microanalysis; Thermodynamic calculations
Dr. Yong Du State Key Laboratory for Powder Metallurgy Central South University, Changsha, Hunan, 410083, P R China Tel.: +86 731 887 6630 Fax: +86 731 871 0855

  1. One of the authors (Y. Du) acknowledges discussions with Drs. S.-L. Chen, F. Y. Xie, F. Zhang, Mrs. Y. Yang and Mr. M. L. Huang. Partial financial support from the Accelerated Insertion of Materials Program from DARPA, and the USAF through the contract F33615-00-C-5215, is greatly acknowledged. We also wish to thank Dr. Dan Backman of GE for his interest in this work.

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Received: 2002-04-25
Published Online: 2022-02-09

© 2002 Carl Hanser Verlag, München

Articles in the same Issue

  1. Frontmatter
  2. Aufsätze/Articles
  3. Dilatometric study of the effect of soluble boron on the continuous and isothermal austenite decomposition in 0.15C–1.6Mn steel
  4. Use of duplex microstructures in steel for estimation of plastic deformation in high-speed machining chips
  5. Stability of strengthened niobium alloys in long-term high-temperature loading conditions
  6. Effect of rare-earth metals on the hot strength of HSLA steels
  7. Wear behaviour of Ni–Cr–Mo–V steel under dry sliding
  8. Thermodynamic calculation of the phase diagram of the Co–Nb–Ta system
  9. Peritectic equilibrium in Fe-Co alloys
  10. A thermodynamic description of the B–Co system: modeling and experiment
  11. Thermodynamic interpretation of thermoelectric phenomena
  12. Unit cell volumes of the silicon- and germanium-containing solid solutions based on the 3d bcc transition metals
  13. Artificial silicide barrier coatings in titanium matrix composites
  14. Notifications/Mitteilungen
  15. Personal/Personelles
  16. DGM Training/DGM Fortbildung
  17. Conferences/Konferenzen
https://doi.org/10.1515/ijmr-2002-0198
Keywords for this article
Phase diagram B–Co; X-ray diffraction; Thermal analysis; Electron probe microanalysis; Thermodynamic calculations

Articles in the same Issue

  1. Frontmatter
  2. Aufsätze/Articles
  3. Dilatometric study of the effect of soluble boron on the continuous and isothermal austenite decomposition in 0.15C–1.6Mn steel
  4. Use of duplex microstructures in steel for estimation of plastic deformation in high-speed machining chips
  5. Stability of strengthened niobium alloys in long-term high-temperature loading conditions
  6. Effect of rare-earth metals on the hot strength of HSLA steels
  7. Wear behaviour of Ni–Cr–Mo–V steel under dry sliding
  8. Thermodynamic calculation of the phase diagram of the Co–Nb–Ta system
  9. Peritectic equilibrium in Fe-Co alloys
  10. A thermodynamic description of the B–Co system: modeling and experiment
  11. Thermodynamic interpretation of thermoelectric phenomena
  12. Unit cell volumes of the silicon- and germanium-containing solid solutions based on the 3d bcc transition metals
  13. Artificial silicide barrier coatings in titanium matrix composites
  14. Notifications/Mitteilungen
  15. Personal/Personelles
  16. DGM Training/DGM Fortbildung
  17. Conferences/Konferenzen
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