EFFECT OF PORES ON THE CLEAVAGE OF TWINNED BORON-CARBIDE CRYSTALS

Authors
OLEINIK GS OSTAPCHUK TV
Citation
Gs. Oleinik et Tv. Ostapchuk, EFFECT OF PORES ON THE CLEAVAGE OF TWINNED BORON-CARBIDE CRYSTALS, Powder metallurgy and metal ceramics, 34(9-10), 1995, pp. 500-504
Citations number
13
Categorie Soggetti
Material Science, Ceramics","Metallurgy & Metallurigical Engineering
Journal title
Powder metallurgy and metal ceramics → ACNP
ISSN journal
10681302
Volume
34
Issue
9-10
Year of publication
1995
Pages
500 - 504
Database
ISI
SICI code
1068-1302(1995)34:9-10<500:EOPOTC>2.0.ZU;2-C
Abstract
The substructure and cleavage fracture in two types of polycrystalline B4C specimens are investigated. It is shown that in specimens hot-pre ssed below 2000 degrees C twins in poreless grains are effective barri ers for cleavage cracks. Cleavage fracture occurs in planes of the typ e <{10(1)over bar 1}>. There are twins and faceted pores in grains of specimens sintered below 2200 degrees C. In these grains cleavage is a long the twinning planes. Pores eliminate the effect of twins as crack stoppers.