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Effect of pores on the cleavage of twinned boron carbide crystals

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Powder Metallurgy and Metal Ceramics Aims and scope

Abstract

The substructure and cleavage fracture in two types of polycrystalline B4C specimens are investigated. It is shown that in specimens hot-pressed below 2000°C twins in poreless grains are effective barriers for cleavage cracks. Cleavage fracture occurs in planes of the type {10\(\bar 1\)1}. There are twins and faceted pores in grains of specimens sintered below 2200°C. In these grains cleavage is along the twinning planes. Pores eliminate the effect of twins as crack stoppers.

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Authors
  1. G. S. Oleinik
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  2. T. V. Ostapchuk
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Additional information

Institute of Materials Science, Ukrainian Academy of Sciences, Kiev. Translated from Poroshkovaya Metallurgiya, Nos. 9–10, pp. 12–17, September–October, 1995.

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Oleinik, G.S., Ostapchuk, T.V. Effect of pores on the cleavage of twinned boron carbide crystals. Powder Metall Met Ceram 34, 500–504 (1996). https://doi.org/10.1007/BF00559956

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