Enhancing the mechanical properties and corrosion resistance of biomedical Ti15Mo alloy with ultra-finer {332} twins via cyclic deformation

IF 5.8 2区 材料科学 Q2 CHEMISTRY, PHYSICAL Journal of Alloys and Compounds Pub Date : 2024-09-18 DOI:10.1016/j.jallcom.2024.176578
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Abstract

Mechanical properties, passivation behaviors and corrosion resistance of biomedical Ti15Mo alloy with ultra-finer twins were investigated. Cyclic deformation was conducted to activating more {332} twin variants via periodic changes of tension and compression. Microstructural refinement via numerous twins with the stable boundaries is different from other mechanisms, resulting in a higher hardness and maintaining the low elastic modulus after deformation and annealing. The results of electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy tests, revealed that twin boundaries are beneficial to enhancing passivation behaviors via forming a thicker oxide film in PBS solution. The alloy with ultra-finer {332} twins exhibit a better corrosion resistance due to a lower passivation current. The expected biomedical performance was obtained in the alloy after ±3 % amplitude cyclic deformation and 730 °C/7 min annealing, in contrast to the initial alloy with coarse grains, increasing 8.8 % of the hardness, decreasing 46 % of the corrosion current and maintaining the low elastic modulus.

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通过循环变形提高具有超细{332}孪晶的生物医学 Ti15Mo 合金的机械性能和耐腐蚀性能
研究了具有超细孪晶的生物医学 Ti15Mo 合金的机械性能、钝化行为和耐腐蚀性。通过拉伸和压缩的周期性变化,循环变形激活了更多的{332}孪晶变体。与其他机制不同的是,通过具有稳定边界的大量孪晶进行微结构细化,可获得更高的硬度,并在变形和退火后保持较低的弹性模量。电化学阻抗谱和 X 射线光电子能谱测试结果表明,孪晶边界有利于在 PBS 溶液中形成更厚的氧化膜,从而提高钝化性能。由于钝化电流较低,具有超细{332}孪晶的合金具有更好的耐腐蚀性。在经过 ±3 % 振幅的循环变形和 730 °C/7 min 退火后,该合金获得了预期的生物医学性能,与最初的粗晶粒合金相比,硬度提高了 8.8%,腐蚀电流降低了 46%,并保持了较低的弹性模量。
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来源期刊
Journal of Alloys and Compounds
Journal of Alloys and Compounds 工程技术-材料科学:综合
CiteScore
11.10
自引率
14.50%
发文量
5146
审稿时长
67 days
期刊介绍: The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.
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