Experimental analysis of mechanical and microstructuralcharacteristics of Ti-HA and Ti-SiO۲ Functionally GradedMaterials fabricated at varying rates of strain

Functionally Graded Material (FGM) is a heterogeneous composite material made by two ormore constituent phases by changing microstructure from one material to another with aspecific gradient. Due to its good mechanical, FGM is used in medical applications, includingdental implants. In this research, the powder metallurgy method was used to fabricate Ti-HAand Ti-SiO۲ FGMs. This method has been implemented using a new device to combine thepowders in a functional manner and with three different strain rates using dynamic and quasistaticcompaction methods to compress the functional powders. The functional samples of Ti-HA and Ti-SiO۲ were made through dynamic compaction using a Split Hopkinson Bar and adrop hammer and quasi-statically using a universal testing apparatus. The relative density ofthe samples made by the three compression methods increased with increasing strain rate. Thehighest relative density for the Ti-HA sample produced using dynamic compaction by SplitHopkinson Bar. By examining the scanning electron microscope images, it was shown thatmaking a functional material with a graded structure has been successful to a significant extent.Increasing the strain rate in both functional materials led to an increase in the maximum forceof indentation while increasing the percentage of ceramic reinforcement (HA or SiO۲) reducedthe maximum force of indentation. The ultimate compressive strength of the Ti-HA and Ti-SiO۲ functionally specimens increased with loading rate.

کلیدواژه ها:

Functionally Graded Material (FGM) ، Strain rate ، Ti-SiO۲ ، Ti-HA