TY - JOUR
T1 - Deformation-induced changeable Young's modulus with high strength in β-type Ti-Cr-O alloys for spinal fixture
AU - Liu, Huihong
AU - Niinomi, Mitsuo
AU - Nakai, Masaaki
AU - Hieda, Junko
AU - Cho, Ken
N1 - Funding Information:
This work was supported in part by Industrial Technology Research Grant Program in 2009 from the New Energy and Industrial Technology Development Organization (NEDO) of Japan , Adaptable and Seamless Technology Transfer Program through Target-driven R&D (A-STEP) from the Japan Science and Technology Agency (JST) , Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS) , and the Inter University Cooperative Research Program “Innovation Research for Biosis-Abiosis Intelligent Interface” from Ministry of Sports, Culture, and Education, Japan .
PY - 2014/2
Y1 - 2014/2
N2 - In order to meet the requirements of the patients and surgeons simultaneously for spinal fixation applications, a novel biomedical alloy with a changeable Young's modulus, that is, with a low Young's modulus to prevent the stress-shielding effect for patients and a high Young's modulus to suppress springback for surgeons, was developed. In this study, the chromium and oxygen contents in ternary Ti(11, 12. mass%)Cr-(0.2, 0.4, 0.6. mass%)O alloys were optimized in order to achieve a changeable Young's modulus via deformation-induced ω-phase transformation with good mechanical properties.The Young's moduli of all the examined alloys increase after cold rolling, which is attributed to the deformation-induced ω-phase transformation. This transformation is suppressed by oxygen but enhanced with lower chromium content, which is related to the β(bcc)-lattice stability. Among the examined alloys, the Ti-11Cr-0.2O alloy shows a low Young's modulus of less than 80. GPa in the solution-treated (ST) condition and a high Young's modulus of more than 90. GPa in the cold rolled (CR) condition. The Ti-11Cr-0.2O alloy also exhibits a high tensile strength, above 1000. MPa, with an acceptable elongation of ~12% in the ST condition. Furthermore, the Ti-11Cr-0.2O alloy exhibits minimal springback. This value of springback is the closest to that of Ti64 ELI alloy among the compared alloys. Therefore, the Ti-11Cr-0.2O alloy, which has a good balance between large changeable Young's modulus, high tensile strength, good plasticity, and minimal springback, is considered to be a potential candidate for spinal fixation applications.
AB - In order to meet the requirements of the patients and surgeons simultaneously for spinal fixation applications, a novel biomedical alloy with a changeable Young's modulus, that is, with a low Young's modulus to prevent the stress-shielding effect for patients and a high Young's modulus to suppress springback for surgeons, was developed. In this study, the chromium and oxygen contents in ternary Ti(11, 12. mass%)Cr-(0.2, 0.4, 0.6. mass%)O alloys were optimized in order to achieve a changeable Young's modulus via deformation-induced ω-phase transformation with good mechanical properties.The Young's moduli of all the examined alloys increase after cold rolling, which is attributed to the deformation-induced ω-phase transformation. This transformation is suppressed by oxygen but enhanced with lower chromium content, which is related to the β(bcc)-lattice stability. Among the examined alloys, the Ti-11Cr-0.2O alloy shows a low Young's modulus of less than 80. GPa in the solution-treated (ST) condition and a high Young's modulus of more than 90. GPa in the cold rolled (CR) condition. The Ti-11Cr-0.2O alloy also exhibits a high tensile strength, above 1000. MPa, with an acceptable elongation of ~12% in the ST condition. Furthermore, the Ti-11Cr-0.2O alloy exhibits minimal springback. This value of springback is the closest to that of Ti64 ELI alloy among the compared alloys. Therefore, the Ti-11Cr-0.2O alloy, which has a good balance between large changeable Young's modulus, high tensile strength, good plasticity, and minimal springback, is considered to be a potential candidate for spinal fixation applications.
KW - Athermal ω phase
KW - Changeable Young's modulus
KW - Deformation-induced ω-phase transformation
KW - Springback
KW - Ternary Ti-Cr-O alloys
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U2 - 10.1016/j.jmbbm.2013.11.001
DO - 10.1016/j.jmbbm.2013.11.001
M3 - Article
C2 - 24317494
AN - SCOPUS:84889644242
VL - 30
SP - 205
EP - 213
JO - Journal of the Mechanical Behavior of Biomedical Materials
JF - Journal of the Mechanical Behavior of Biomedical Materials
SN - 1751-6161
ER -