Role of niobium in the high-temperature oxidation of titanium

被引：4
作者：
Valenza, Thomas C. [1 ]
Weber, Peter K. [2 ]
Marquis, Emmanuelle A. [1 ]
机构：
[1] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA
[2] Lawrence Livermore Natl Lab, Phys & Life Sci Directorate, Livermore, CA 94550 USA
来源：
CORROSION SCIENCE | 2023年 / 225卷
基金：
美国国家科学基金会;
关键词：
Titanium; Oxidation; EPMA; APT; STEM; SIMS; BEHAVIOR; OXYGEN; NB; MORPHOLOGY; TI;
D O I：
10.1016/j.corsci.2023.111603
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We compared the oxidation of Ti and Ti-2 at.% Nb at 800 degrees C in Ar-20% O2 and in sequential 16O2 -18O2 atmo-spheres to clarify the role of niobium in the high-temperature oxidation of titanium. Niobium had no effect on the amount of oxygen dissolved in the metal or on oxygen diffusion in the metal. Instead, niobium enhanced oxidation resistance by segregating to TiO2 grain boundaries, where it likely slowed outward Ti diffusion. These findings spotlight doping of TiO2 grain boundaries as a strategy for improving the oxidation resistance of Ti alloys and, more generally, TiO2-forming alloys.
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页数：9
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