2011 journal article

The Effects of Residual Stress Distributions on Indentation-induced Microcracking in B4C-TiB2 Eutectic Ceramic Composites

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 94(11), 4032–4039.

By: R. White* & E. Dickey n 

co-author countries: United States of America πŸ‡ΊπŸ‡Έ
Source: Web Of Science
Added: August 6, 2018

The boron carbide ( B 4 C ) titanium diboride ( TiB 2 ) ceramic eutectic is being investigated for armor and tribological applications. Electron diffraction shows [11 0] TiB 2 //[21 1] B 4 C //growth direction, (0001) TiB 2 //( 2 0) B 4 C is parallel to the interface plane, and transmission electron microscopy ( TEM ) imaging reveals no interface phase. Thermal residual stress distributions are calculated via finite element modeling of an experimental eutectic microstructure. The B 4 C matrix is found to be about 400 MPa in compression, and the TiB 2 lamellae approximately 1.3 GPa in tension. Stress and strain energy concentrations are found at the tips of TiB 2 lamellae. TEM of deformed materials correlates well with the finite element calculations, showing preferential fracture in areas of stress concentration. Interfacial delamination and crack deflection are also observed in deformed materials.