Synthesis and characterisation of a new superelastic Ti-25Ta-25Nb biomedical alloy.
In this study, a new Ti-25Ta-25Nb (mass%) beta alloy was synthesised by cold crucible semi-levitation melting. This technique made it possible to obtain homogeneous ingots although the elements used have very different melting points. After melting, a thermo-mechanical treatment was applied in order to obtain a perfectly recrystallised beta microstructure. For this alloy composition, the tensile tests showed a very low Young's modulus associated with an important super-elastic behaviour, which contributes to decrease the elastic modulus under stress and to increase the recoverable strain. On the other hand, the corrosion tests, which were carried out in a neutral Ringer solution, indicated a corrosion resistance higher than that of the commercially pure CP Ti alloy. These results show that this new alloy possesses all the characteristics necessary for its long-term use in medical implants.
Bertrand
E
E
INSA Rennes, UMR CNRS 6226 SCR/Chimie-Métallurgie, 20 avenue des Buttes de Coësmes, 35043 Rennes Cedex, France.
Gloriant
T
T
Gordin
D M
DM
Vasilescu
E
E
Drob
P
P
Vasilescu
C
C
Drob
S I
SI
D000497:Alloys / Q000138:chemical synthesis*; D020099:Coated Materials, Biocompatible / Q000138:chemical synthesis*; D003343:Corrosion; D004548:Elasticity; D007552:Isotonic Solutions / Q000737:chemistry; D009556:Niobium / Q000737:chemistry; D000077331:Ringer's Solution; D013314:Stress, Mechanical; D013635:Tantalum / Q000737:chemistry; D013696:Temperature; D013718:Tensile Strength; D014025:Titanium / Q000737:chemistry
D000497:Alloys; D020099:Coated Materials, Biocompatible; D007552:Isotonic Solutions; D009556:Niobium; D013635:Tantalum; D000077331:Ringer's Solution; D014025:Titanium