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Microstructural adjustments and mechanical properties of a cold-rolled biomedical near β−Ti alloy sheet

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Abstract

In this study, microstructural adjustments and mechanical properties of a cold-rolled near β-type alloy Ti−25Nb−3Zr−3Mo−2Sn (wt%) sheet were investigated. Microstructures and phase transformation products strongly depended on aging temperatures. Solution treatments within single β-phase field removed the stress-induced α″ martensites and produced a few new lath-shaped ones, but metastable β phase still dominated. This is exactly the reason why current alloy exhibits the lowest modulus (54 GPa) and best elongation to fracture (39 %), but the worst yield strength of only 340 MPa, at solution-treated state. A fairly large number of ellipsoidal ω phase nanoparticles precipitated throughout parent β phase during aging at 380 °C. These ω nanoparticles possess remarkable strengthening effect, but deteriorate ductility seriously. A novel post-aging process was proposed to remove brittle ω phase. By contrast, aging at 450 °C resulted in sufficient precipitation of fine needle-like α phase. This brought about the best combination of high yield strength (770 MPa) and moderate elastic modulus (75 GPa) and good elongation (15 %) for biomedical implants.

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Acknowledgments

This work was financially supported by Industrial Science Technology Project of Shaanxi Province (No. 2015GY160), Western Metal Materials Innovation Fund (No. XBCL03-18) and International Cooperation and Exchanges of State Commission of Science Technology of China (No. 2014DFA30880).

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Authors and Affiliations

  1. Northwest Institute for Nonferrous Metal Research, Xi’an, 710016, China

    Xi-Qun Ma, Zhen-Tao Yu, Sen Yu & Chang Wang

  2. School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China

    Hong-Zhi Niu

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  1. Xi-Qun Ma
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  2. Hong-Zhi Niu
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  3. Zhen-Tao Yu
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  4. Sen Yu
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Correspondence to Xi-Qun Ma.

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Ma, XQ., Niu, HZ., Yu, ZT. et al. Microstructural adjustments and mechanical properties of a cold-rolled biomedical near β−Ti alloy sheet. Rare Met. 37, 846–851 (2018). https://doi.org/10.1007/s12598-016-0801-9

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  • DOI: https://doi.org/10.1007/s12598-016-0801-9

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