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首页> 外文期刊>Acta biomaterialia >High resolution transmission electron microscopy study of the hardening mechanism through phase separation in a beta-Ti-35Nb-7Zr-5Ta alloy for implant applications.
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High resolution transmission electron microscopy study of the hardening mechanism through phase separation in a beta-Ti-35Nb-7Zr-5Ta alloy for implant applications.

机译：高分辨率透射电子显微镜研究了用于植入应用的β-Ti-35Nb-7Zr-5Ta合金中相分离引起的硬化机理。

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摘要

beta-Ti alloys are highly attractive metallic materials for biomedical applications due to their high specific strength, high corrosion resistance and excellent biocompatibility, including low elastic modulus. This work aims to clarify the hardening mechanism of a beta-Ti-Nb-Zr-Ta alloy using different characterization techniques. Ingots (50 g) of Ti-35Nb-7Zr-5Ta (wt.%) alloy were arc furnace melted in an Ar((g)) atmosphere, homogenized, hot rolled, solubilized and finally aged at several temperatures from 200 to 700 degrees C for 4 h. Microstructure characterization was performed using X-ray diffraction, optical microscopy, scanning and high resolution transmission electron microscopy (HR-TEM). The 4 h aging showed that the highest hardness values were found when aged at 400 degrees C and the HR-TEM images confirmed splitting of spots on the Fourier space map, which indicated the presence of a coherent interface between separated phases (beta and beta') and explains the hardening mechanism of the alloy. Through geometric phase analysis analysis, using the HR-TEM image, the localized strain map showed 5-10 nm domains of the beta and beta' phases. The combination of suitable values of yield strength, hardness and low Young's modulus makes Ti-35Nb-7Zr-5Ta alloy suitable for medical applications as a metallic orthopedic implant.
机译：β-Ti合金具有高比强度，高耐腐蚀性和出色的生物相容性（包括低弹性模量），是生物医学应用中极具吸引力的金属材料。这项工作旨在阐明使用不同的表征技术的β-Ti-Nb-Zr-Ta合金的硬化机理。将Ti-35Nb-7Zr-5Ta（wt。％）合金的铸锭（50 g）在Ar（（g））气氛中进行电弧炉熔化，均匀化，热轧，溶解，最后在200至700度的多个温度下进行时效C持续4小时。使用X射线衍射，光学显微镜，扫描和高分辨率透射电子显微镜（HR-TEM）进行微观结构表征。老化4小时表明，在400摄氏度下老化时发现了最高的硬度值，并且HR-TEM图像证实了傅立叶空间图上斑点的分裂，这表明分离相之间存在一致的界面（β和β' ），并说明了合金的硬化机理。通过几何相位分析，使用HR-TEM图像，局部应变图显示了β和β'相的5-10 nm域。屈服强度，硬度和低杨氏模量的适当值的组合使得Ti-35Nb-7Zr-5Ta合金适合作为金属骨科植入物用于医疗应用。

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