|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Powder Metallurgy of Light Metals
||Mechanical Properties and Microstructure of PM Ti-Si3N4 Discontinuous Fibre Composite
||Troy Dougherty, Ying Xu, Ainaa Hanizan
|On-Site Speaker (Planned)
2 vol% α-Si3N4 fiber Ti composites were manufactured by uniaxially pressing the powders and subjecting the green compact to pressureless sintering at 1400°C in flowing argon. The resulting composites were >98% theoretical density. The hardness of the titanium composite was measured at HBW 401±16 compared to HBW 293±8 for pure titanium. Microstructural analysis showed clearly defined 200-300nm diameter crystalline fibres throughout the composite with a 2-4μm reaction boundary cementing them to the titanium. Concentrations of smaller Si3N4 particles were located at the titanium grain boundaries which may have reacted to form Ti-Si-N phases. The improved mechanical properties might be from a combination of discontinuous fiber reinforcement, nitrogen addition to the Ti matrix, and grain-boundary reinforcement.
||Planned: EPD Congress Volume