Publication Date:
2011-06-22
Description:
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.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
