Characterisation of a Ductile Ti-3Al-2.5V/TiBp Composite Produced via Mechanical Alloying

摘要

An in-situ Ti-3Al-2. 5V/TiBp discontinuously reinforced Titanium Matrix Composite, containing 10% of TiB by volume, was produced via a powder metallurgy route. Ti-3Al-2. 5 alloy atomised powders were mechanically alloyed with 6. 4wt% of TiB2 to produce composite powders. The powders were consolidated using Hot Isostatic Pressing. The consolidated composite was heat treated under various conditions to achieve a complete conversion of the TiB2 particles to TiB needles. Good ductility of the composite was achieved via this process. The microstructure of the composite is described here and analysed for the different stages of the process. Special attention is given to the influence of the different heat treatments on the microstructure, and their effect on the mechanical properties. A correlation between the microstructure and the theoretical mechanical properties is made using the Halpin-Tsai model.