Microstructure, mechanical properties and springback behaviour of Ti‑6Al‑4V alloy connection rod for spinal fixation device

The effect of annealing condition on microstructure, mechanical properties and springback behaviour was examined in the connection rod of Ti-6Al-4V alloy for spinal fixation devices. Compared with the deformed microstructure in the sample before annealing, relatively few equiaxed grains were present...

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Bibliographic Details
Published in:Materials Science & Engineering C 2019-01, Vol.94, p.811-820
Main Authors: Li, Qiaochu, Min, Xiaohua, Bai, Pengfei, Wang, Weiqiang, Tao, Xiaojie, Zhong, Gongcheng, Bai, Shuyu, Zhao, Jie
Format: Article
Language:English
Subjects:
Annealing
Bend strength
Bending modulus
Connection rod of spinal fixation device
Deformation
Diamond pyramid hardness
Fixation
Grains
Hardness
Materials science
Materials Testing
Mechanical properties
Microstructure
Modulus
Orthopedic Fixation Devices
Recrystallization
Spine - surgery
Springback
Springback behaviour
Strength
Tensile Strength
Titanium - chemistry
Titanium alloy
Titanium alloys
Titanium base alloys
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Summary:The effect of annealing condition on microstructure, mechanical properties and springback behaviour was examined in the connection rod of Ti-6Al-4V alloy for spinal fixation devices. Compared with the deformed microstructure in the sample before annealing, relatively few equiaxed grains were present after annealing at 1003 K after 1.8 ks, and a considerable amount appeared at 7.2 ks. When annealing time was extended to 36 ks, the recrystallised grains further grew. Vickers hardness, tensile strength and bending strength decreased with increasing annealing time, whereas the elastic and bending moduli showed no significant change with annealing time of up to 7.2 ks and then slightly decreased at 36 ks. The springback ratio was closely associated with strength and modulus and applied bending deflection. The springback ratio reached the highest and lowest values in the sample before and after annealing for 7.2 ks, respectively. A good combination of strength, modulus and springback ratio was obtained in the sample after annealing for 7.2 ks. •Low springback ratio is necessary for connection rod for spinal fixation device.•Both strength and modulus of Ti‑6Al‑4V alloy determine the springback ratio.•A good combination of strength, modulus and springback ratio was obtained after specific annealing treatment.
ISSN:0928-4931
1873-0191
DOI:10.1016/j.msec.2018.10.030