Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7866801 | Materials Science and Engineering: C | 2016 | 7 Pages |
Abstract
Equi-atomic NiTi alloy composites reinforced with 0, 2, 4 and 6Â vol.% nano-hydroxyapatite (HA) were successfully synthesized using pressureless sintering. Pure Ni and Ti elements were ball milled for 10Â h in order to produce a mechanically alloyed equi-atomic NiTi alloy (MA-NiTi). Mechanically alloyed NiTi and HA powders were blended, compacted and then sintered for 3Â h at 1325Â K. The sintered density varied inversely with volume percent of HA reinforcement. The X-Ray diffraction spectra and SEM images showed the formation of multiple phases like NiTi, NiTi2, Ni3Ti, and Ni4Ti3. The back scattered-SEM image analysis confirmed the presence of Ni-rich and Ti-rich phases with increasing HA content. The 6Â vol.% HA reinforced composite showed Ni3Ti as the major phase having the highest hardness value which can be attributed to the presence of relatively harder phases along with higher HA content as a reinforcement. The composite of MA-NiTi with 2Â vol.% HA manifested the most desirable results in the form of better sintering density mainly due to the minute decomposition of NiTi into other phases. Therefore, the 2Â vol.% reinforced MA-NiTi composite can be exploited as a novel material for manufacturing biomedical implants.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Biomaterials
Authors
Muhammad Akmal, Ahmad Raza, Muhammad Mudasser Khan, M. Imran Khan, Muhammad Asif Hussain,