Elastic deformation behaviour of Ti-24Nb-4Zr-7.9Sn for biomedical applications.
In this paper, the elastic deformation behaviour of a recently developed beta-type titanium alloy Ti-24Nb-4Zr-7.9Sn (wt.%) that consists of non-toxic elements and is intended for biomedical applications is described. Tensile tests show that this alloy in the as hot-rolled state exhibits peculiar non-linear elastic behaviour with maximum recoverable strain up to 3.3% and incipient Young's modulus of 42GPa. Solution treatment at high temperature has trivial effect on super-elasticity but decreases strength and slightly increases the incipient Young's modulus. Ageing treatment in the (alpha+beta) two-phase field increases both strength and Young's modulus and results in a combination of high strength and relatively low elastic modulus. In spite of the formation of the alpha phase, short time ageing has no effect on super-elasticity, whereas the non-linear elastic behaviour transforms gradually to normal linear elasticity with the increase of ageing time. We suggest sluggish, partially reversible processes of stress-induced phase transformation and/or incipient kink bands as the origin of the above peculiar elastic behaviour.
Hao
Y L
YL
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China. ylhao@imr.ac.cn
Li
S J
SJ
Sun
S Y
SY
Zheng
C Y
CY
Yang
R
R
D000497:Alloys / Q000737:chemistry*; D001672:Biocompatible Materials / Q000737:chemistry*; D004548:Elasticity; D004583:Electrons; D006358:Hot Temperature; D008422:Materials Testing; D046529:Microscopy, Electron, Transmission; D009556:Niobium / Q000737:chemistry*; D011312:Pressure; D013314:Stress, Mechanical; D013718:Tensile Strength; D014001:Tin / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction; D015032:Zinc / Q000737:chemistry*
D000497:Alloys; D001672:Biocompatible Materials; D009556:Niobium; D014001:Tin; D014025:Titanium; D015032:Zinc