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β钛合金表面渗氧强化机理研究

王秀群, 韩卫忠*，单智伟
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2022年 第41卷 第5期: 1000-6281（2022）05-515-05     下载地址：

β钛合金表面渗氧强化机理研究

王秀群, 韩卫忠*，单智伟

（西安交通大学, 金属材料强度国家重点实验室, 微纳尺度材料行为研究中心, 陕西 西安710049）

摘  要 本文通过设计一种新型充氧技术，采用显微维氏硬度测试和电子显微技术表征研究了氧原子对β钛合金硬化行为及对应显微组织的影响。结果表明，经充氧处理获得内部具有氧原子梯度分布的β钛合金，靠近表面处固溶的高浓度氧原子诱导α相在β基体析出。不同β钛合金显示出不同的α析出相形貌，其中Ti1300的α相呈板条状，Ti32Mo中的α相呈片层状。固溶氧原子倾向于在α析出相内偏聚，导致α相具有较高硬度。在梯度分布的固溶氧原子与相结构协同作用下，β钛合金展现出超高硬度和优异的耐磨损性能。充氧技术具有强韧化效果显著、工艺简单、成本低廉、经济环保等优点，是一种提高生物医用钛/锆合金强韧性的新技术。

关键词  β钛合金；充氧技术；硬化；扫描电子显微镜

中图分类号：TG115.21+5.3；TG146；TG166   

文献标识码：A   doi:10.3969/j.issn.1000-6281.2022.05.006

 

Hardening mechanism of surface oxygen-charging in βtitanium alloy

WANG Xiu-qun，HAN Wei-zhong*，SHAN Zhi-wei

(Center for Advancing Materials Performance from the Nanoscale, State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an Shannxi 710049, China)

Abstract      By using a novel oxygen-charging technique, the effects of oxygen solutes on hardening behavior and phase microstructures of β titanium alloys were investigated via Vickers hardness testing and electron microscopy technique. The results show that β titanium alloys with oxygen gradients are obtained via oxygen-charging treatment. The high concentration of oxygen atoms near the surface of β titanium alloys leads to the precipitation of α phase in β matrix. These precipitated α phases have different morphologies in different β titanium alloys. For example, the precipitated α phases have a lath-like structure in Ti1300 alloys, while they show a platelet-like structure in Ti32Mo alloys. These precipitated α phases have a relatively high hardness due to the segregation of oxygen solute atoms in α phases. The synergistic effect of oxygen gradient and hetero-phase structures contributes to the super high hardness and excellent abrasive resistance of β titanium alloys. The oxygen-charging technique has the advantage of superb hardening, operability, economy and environmental compatibility, making it as a practical and reliable method for manufacturing and processing biomedical titanium and zirconium alloys with excellent performance.

Keywords  β-Ti alloy; oxygen-charging; hardening; SEM

 

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