Materials Science and Engineering: A ( IF 4.652 ) Pub Date : 2020-01-07 , DOI: 10.1016/j.msea.2020.138910 Amit Abhash; Pradeep Singh; Venkat A N Ch; Sriram Sathaiah; Rajeev Kumar; Gaurav K. Gupta; D.P. Mondal
Ti–Al–Co (6 wt% of Al and varying amount of Co content) alloys foams of different space holder contents (40 ± 2.5 to 70 ± 5% by volume with an increment of 10%) were fabricated using ammonium bicarbonate (NH4HCO3) as space holder. These foams were analysed in terms of cell morphology, microstructure, mechanical and corrosion properties. The cell sizes were almost invariant to the Co content and space holder content. The cell wall thickness increased with increase in relative density. It was found that with increase in Co contents in the Ti–Al–Co alloys, compressive strength, Young's modulus, energy absorption capacity and microhardness increases. Empirical relations were established to correlate these mechanical properties with Co wt%, strain rate (έ) and relative density. The experimentally obtained results were also verified with the existing analytical relation. It was observed that the openness of the foams increases with increase in space holder content. It was found that the Co concentration in the samples does not influence degree of openness but it influences the corrosion behaviour of the investigated foams. The corrosion rate (in mmpy) and electrochemical potential parameters were also obtained in simulated bio fluid, and compared with those of other Ti-alloys and found to be in close agreement with each other.To examine the suitability for bone implant application, the investigated Ti–Al–Co alloys foams were compared with human cortical as well as cancelleous bone in terms of macrostructural, microstructural, corrosion behaviour and mechanical properties. In every aspects these foams were found to be suited for bone implant application.