深入了解钨对高强度钛合金腐蚀行为的影响

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Research and Technology-Jmr&t Pub Date : 2024-09-11 DOI:10.1016/j.jmrt.2024.09.070
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引用次数: 0

摘要

具有良好耐腐蚀性能的高性能钛合金有望应用于海洋环境。在这项工作中,我们利用粉末冶金和热挤压技术开发了一种 Ti20W 合金,该合金兼具卓越的机械性能和良好的耐腐蚀性能。Ti20W 合金具有超高强度(1400 兆帕)和良好的延展性(7%),比屈服强度与普通高强度 Ti 合金相当。超高强度 Ti20W 合金具有 W 原子固溶和细小 α 相析出的特点。与 Ti6Al4V 合金相比,Ti20W 合金在 3.5 wt% 的 NaCl 溶液中显示出较低的腐蚀电流密度值,这归因于 W 元素的固溶和较细的α相。W 氧化物,尤其是 WO3,起到了屏障的作用,有效地阻止了 Cl- 向内部氧化层的渗透,从而增强了耐腐蚀性。在钝化过程中,细小的 α 相可以被周围的基体氧化物桥接,这有助于减少 α 相与基体之间的电化学腐蚀,从而进一步提高耐腐蚀性。
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Insights into the role of tungsten on corrosion behavior of high-strength Ti alloys

High-performance titanium alloys with good corrosion resistance are expected to be applied in marine environments. In this work, we developed a Ti20W alloy using powder metallurgy and hot extrusion, which combined remarkable mechanical properties and good corrosion resistance. The Ti20W alloys exhibited ultrahigh strength (>1400 MPa) and good ductility (>7%), and the specific yield strength was comparable to the common high-strength Ti alloys. The ultrahigh-strength Ti20W alloys had characteristics of the solid solution of W atoms and the precipitation of fine α phases. Compared with Ti6Al4V alloy, the Ti20W alloys showed lower corrosion current density values in 3.5 wt% NaCl solution, which was attributed to the solid solution of W elements and the finer α phases. The W oxides, particularly WO3, acted as the barrier to effectively block the penetration of Cl into the inner oxide layer, thereby enhancing the corrosion resistance. The fine α phases could be bridged by the surrounding matrix oxides during the passivation process, which contributed to decreasing the galvanic corrosion between the α phases and the matrix, further improving the corrosion resistance.

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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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