Soviet Powder Metallurgy and Metal Ceramics

, Volume 24, Issue 9, pp 707–710 | Cite as

Effect of annealing on the structure and properties of hot-pressed boron carbide base cermets

  • M. S. Koval'chenko
  • A. V. Laptev
  • A. B. Zhidkov
Test Methods and Properties of Materials


During the annealing of a hot-pressed boron carbide-aluminum materials at a temperature exceeding the melting point of aluminum intense formation ofα-AlB12 takes place. This has a deleterious effect on the strength properties (transverse rupture strengthσtr, fracture toughness kIc, and impact strengtha) of the material and increases its hardness and electrical resistivity. It follows therefore that, to obtain boron car-bide-aluminum materials of maximum strength, it is necessary to perform their liquid-phase pressing under high pressures (above 0.5 GPa) and dispense with subsequent annealing. Annealing at a temperature below the melting point of aluminum brings about only very small changes in the structure of the material, and the resultant fall in hardness is less than the increase in hardness. Consequently, when it is necessary to increase the hardness of the material and a slight loss of strength is acceptable, recourse may be had to low-temperature annealing (below 660°C).


Carbide Boron Melting Point Fracture Toughness Electrical Resistivity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Literature cited

  1. 1.
    G. V. Samsonov, L. Ya. Markovskii, A. F. Zhigach, and M. G. Valyashko, Boron and Its Compounds and Alloys [in Russian], Izd. Akad. Nauk Ukr. SSR, Kiev (1960).Google Scholar
  2. 2.
    N. I. Bodnaruk, “Wetting and infiltation of B4C by aluminum alloys,” in: Compatibility and Adhesional Interaction of Melts and Metals [in Russian], Inst. Probl. Materialoved., Akad. Nauk Ukr. SSR, Kiev (1978), pp. 53–58.Google Scholar
  3. 3.
    A. D. Panasyuk, V. R. Maslennikova, and É. V. Marek, “Reactions of materials of the B4C-Cr-system with liquid metals,” Poroshk. Metall., No. 10, 75–78 (1981).Google Scholar
  4. 4.
    L. J. Broutman and R. H. Krock (eds.), Composite Materials. Vol. 1. Interfaces in Metallic Composites [Russian translation], Mir-Mashinostroenie, Moscow (1978).Google Scholar
  5. 5.
    E. F. Filimonov, I. A. Kondrat'ev, V. F. Melekhin, et al., “Infiltration of a carbon material by an aluminum base alloy,” in: Adhesion of Metals and Alloys [in Russian], Naukova Dumka, Kiev (1977), pp. 121–124.Google Scholar
  6. 6.
    Yu. V. Naidich, Contact Phenomena in Metallic Melts [in Russian], Naukova Dumka, Kiev (1972).Google Scholar

Copyright information

© Plenum Publishing Corporation 1986

Authors and Affiliations

  • M. S. Koval'chenko
    • 1
  • A. V. Laptev
    • 1
  • A. B. Zhidkov
    • 1
  1. 1.Institute of Materials ScienceAcademy of Sciences of the Ukrainian SSRUkraine

Personalised recommendations