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Enhanced thermal stability of a cobalt–boron carbide nanocomposite by ion-implantation

  • Melina daSilva , Uta Klement and Glenn D. Hibbard
Published/Copyright: May 23, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 98 Issue 11

Abstract

A first investigation of the thermal stability in a wear resistant cobalt-boron carbide (Co – B4C) nanocomposite has been performed by the combination of calorimetry and transmission electron microscopy. The calorimetric measurements show that the thermal stability of Co – B4C is not influenced by the presence of the 10 vol.% μm-sized boron carbide particles. However, grain growth is shifted to significantly higher temperatures during in-situ annealing (in the transmission electron microscope), and abnormal grain growth is not observed to be as extensive as in conventional nanocrystalline Co. This effect is mainly attributed to the observed implantation of Ga atoms during transmission electron microscope specimen thinning by focused ion beam. Grain boundary segregation mechanisms are discussed as possible reasons for the retarded grain growth.

Keywords: Nanocomposite; Cobalt – boron carbide; Thermal stability; Ion-implantation; Focused ion beam
* Correspondence address, Prof. Uta Klement, Dept. of Materials and Manufacturing Technology, Chalmers University of Technology, Hörslsvägen 7, SE-41296 Göteborg, Sweden, Tel.: +46 31 772 12 64, Fax: +46 31 772 13 13, E-mail:

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Received: 2007-4-5
Accepted: 2007-8-2
Published Online: 2013-05-23
Published in Print: 2007-11-01

© 2007, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.101571
Keywords for this article
Nanocomposite; Cobalt – boron carbide; Thermal stability; Ion-implantation; Focused ion beam

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Professor Dr. phil. Dr. techn. e. h. Hellmut F. Fischmeister
  5. Basic
  6. Compressive deformation of lamellar microstructures – a short review
  7. Influence of external and internal length scale on the flow stress of copper
  8. Spinodal decomposition of cubic Ti1−xAlxN: Comparison between experiments and modeling
  9. Combined ab-initio and N-K, Ti-L2,3, V-L2,3 electron energy-loss near edge structure studies for TiN and VN films
  10. Gold-enhanced oxidation of silicon nanowires
  11. Numerical determination of parameterised failure curves for ductile structural materials
  12. Relaxation of semiconductor nanostructures using molecular dynamics with analytic bond order potentials*
  13. Examination of phase transformations in the system Fe–N–C by means of nitrocarburising reactions and secondary annealing experiments; the α + ∊ two-phase equilibrium
  14. Applied
  15. On the evolution of secondary hardening carbides in a high-speed steel characterised by APFIM and SANS
  16. Silicon nitride tools for hot rolling of high-alloyed steel and superalloy wires – load analysis and first practical tests
  17. Development of the unloading stiffness during cyclic plastic deformation of a high-strength aluminium alloy in different tempers
  18. Enhanced thermal stability of a cobalt–boron carbide nanocomposite by ion-implantation
  19. Experimental studies and thermodynamic simulation of phase transformations in high Nb containing γ-TiAl based alloys
  20. Kinetics of nanoscale structure development during Mg-vapour reduction of tantalum oxide
  21. On the interaction of ductile damage and materials softening of a Ni-base alloy during hot deformation
  22. Adhesive contact between flat punches with finite edge radius and an elastic half-space
  23. Notifications
  24. DGM News
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