Structure, physical and mechanical properties of TiB-40 wt.%Ti composite materials obtained by unrestricted SHS compression

Abstract

The paper demonstrates some peculiarities of phase composition, structure and physico-mechanical properties of TiB-40 wt.%Ti composite material obtained by unrestricted SHS compression from the following initial powders: 89 wt.% Ti (> 99.1 %, 45 μm) и 11 wt.% B (amorphous black boron, 99 %, 1 μm) at P = 10 MPa. The method of unrestricted SHS compression combines Self-propagating high-temperature synthesis (SHS) and High-temperature shear deformation of combustion products. A compact plate of the composite material of 55х100х8 mm in size was obtained and used to make standard samples of two types for material science investigations: parallel and perpendicular ones to the applied loading at SHS compression. The results of Scanning Electron Microscopy, Energy-dispersion and X-Ray diffraction analyses are shown. Orientation of TiB macro-layers and whiskers is shown to be formed perpendicular to the applied loading as a result of high-temperature shear deformation. The nature of the fracture of the composite material is studied, the dependence of mechanical and physical characteristics on the orientation of TiB whiskers in the composite material is established.