Accelerated Diffusion Phenomenon in Ti-B4C System and its Influence on the Resulting Composites

Ti(O)-B4C diffusion couples and (TiC + TiB)/Ti(O) composites were prepared to study the accelerated diffusion phenomenon and its influence at beta transition temperatures (beta(t)) of Ti matrix. Results show that Ti(O) alloys can be successfully prepared from Ti and TiO2 powder, and their beta(t) can be regulated by controlling O contents. Thickness of reaction products in Ti(O)-B4C reaches the maximum when it is sintered at beta(t), indicating that alpha/beta transition of Ti matrix can accelerate the diffusion of atoms inside it. Besides, (TiC + TiB)/Ti(O) composites have the highest size and number of reinforcements when Ti(O)-B4C powders are sintered at beta(t) temperature, especially for TiB fiber, but its flexural strength and plasticity are the lowest due to the interface stripping between the coarse reinforcements and matrix.

Automated summary

Ti(O)-B4C diffusion couples and (TiC + TiB)/Ti(O) composites were prepared to study the accelerated diffusion phenomenon and its influence at beta transition temperatures (beta(t)) of Ti matrix. Results showed that the thickness of reaction products in Ti(O)-B4C reached the maximum when sintered at beta(t), indicating that the alpha/beta transition of Ti matrix accelerated the diffusion of atoms. Additionally, (TiC + TiB)/Ti(O) composites had the highest size and number of reinforcements when sintered at beta(t), but had the lowest flexural strength and plasticity due to interface stripping.