Abstract

High entropy alloys (HEAs) are potential materials for biomedical applications due to their unique properties. Also, the use of functionally graded porous materials (FGPM) presents an interesting approach that could help to decrease the Young's modulus while simultaneously mimicking highly hierarchical porosity of the bone structure. In this study, Field Assisted Sintering Technology/Spark Plasma Sintering (FAST/SPS) and space-holder techniques were used to determine the viability of its use for produce HEAs which exhibit radially graded porous structures from Ti, Nb, Ta, Hf and Mo powders, using NH4HCO3 as space-holder. Results have shown that the radially porous gradient was formed when sintering at 1450°C and 10 min, but the sintering necks were not sufficient to provide adequate mechanical properties and achieve the desired porosity levels. Hence, future studies have to be carried out to determine the adequate sintering parameters to achieve good diffusion between particles.