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Deformation-induced ω phase in modified Ti-29Nb-13Ta-4.6Zr alloy by Cr addition.
|Title||Deformation-induced ω phase in modified Ti-29Nb-13Ta-4.6Zr alloy by Cr addition.|
|Publication Type||Journal Article|
|Year of Publication||2013|
|Authors||Li Q, Niinomi M, Hieda J, Nakai M, Cho K|
|Date Published||2013 Aug|
For spinal-fixation applications, implants should have a high Young's modulus to reduce springback during operations, though a low Young's modulus is required to prevent stress shielding for patients after surgeries. In the present study, Ti-29Nb-13Ta-4.6Zr alloy (TNTZ) with a low Young's modulus was modified by adding Cr to obtain a higher deformation-induced Young's modulus in order to satisfy these contradictory requirements. Two newly designed alloys, TNTZ-8Ti-2Cr and TNTZ-16Ti-4Cr, possess more stable β phases than TNTZ. These alloys consist of single β phases and exhibit relatively low Young's moduli of <65GPa after solution treatment. However, after cold rolling, they exhibit higher Young's moduli owing to a deformation-induced ω-phase transformation. These modified TNTZ alloys show significantly less springback than the original TNTZ alloy based on tensile and bending loading-unloading tests. Thus, the Cr-added TNTZ alloys are beneficial for spinal-fixation applications.
|Alternate Journal||Acta Biomater|