粉末冶金Ti–45Al–10Nb合金的高温抗氧化性能

金旭晨; 叶培浩; 纪红蕊; 索转霞; 魏博鑫; 李学问; 房文斌

doi:10.1007/s12613-021-2320-4

Volume 29 Issue 12

Dec. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(12): 2232-2240

Xuchen Jin, Peihao Ye, Hongrui Ji, Zhuanxia Suo, Boxin Wei, Xuewen Li, and Wenbin Fang, Oxidation resistance of powder metallurgy Ti–45Al–10Nb alloy at high temperature, Int. J. Miner. Metall. Mater., 29(2022), No. 12, pp. 2232-2240. https://doi.org/10.1007/s12613-021-2320-4

Cite this article as:

Xuchen Jin, Peihao Ye, Hongrui Ji, Zhuanxia Suo, Boxin Wei, Xuewen Li, and Wenbin Fang, Oxidation resistance of powder metallurgy Ti–45Al–10Nb alloy at high temperature, Int. J. Miner. Metall. Mater., 29(2022), No. 12, pp. 2232-2240. https://doi.org/10.1007/s12613-021-2320-4

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研究论文

粉末冶金Ti–45Al–10Nb合金的高温抗氧化性能

1)
哈尔滨科技大学材料科学与工程学院, 哈尔滨 150040, 中国
2)
燕山大学亚稳材料制备技术与科学国家重点实验室, 秦皇岛 066004, 中国

通讯作者:
李学问 E-mail: lixuewen@hrbust.edu.cn

文章亮点

(1) 系统地研究了高温氧化过程中粉末冶金Ti–45Al–10Nb合金表面氧化组织的演变规律。

(2) 系统地研究了粉末冶金Ti–45Al–10Nb合金的高温抗氧化机理。

(3) 总结并提出了Nb能够提高TiAl基合金的高温抗氧化性的原因。

中文摘要

通过粉末冶金法制备了化学成分为Ti–45Al–10Nb的高Nb含量的TiAl合金，并研究了其在850、900和950°C下的抗氧化性能。根据氧化皮形貌和微观结构演变分析，讨论了高温下的抗氧化机理。850°C和900°C的氧化皮结构相似，TiO₂+Al₂O₃混合物覆盖在弥散分布TiO₂+Nb₂O₅的基体层。在950℃时，氧化皮从外部到母体金属分为四层：疏松的TiO₂+Al₂O₃层、致密的Al₂O₃层、致密的TiO₂+Nb₂O₅层和弥散分布TiO₂+Nb₂O₅的基体层。Nb层抑制了Ti原子的向外扩散，阻碍了TiO₂的生长，同时促进形成连续的Al₂O₃保护层，使合金具有长期的高温抗氧化能力。

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Research Article

Oxidation resistance of powder metallurgy Ti–45Al–10Nb alloy at high temperature

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Abstract

Abstract

TiAl alloy with high Nb content, nominally Ti–45Al–10Nb, was prepared by powder metallurgy, and the oxidation resistance at 850, 900, and 950°C was investigated. The high-temperature oxidation-resistance mechanism and oxidation dynamics were discussed following the oxide skin morphology and microstructural evolution analysis. The oxide skin structures were similar for 850 and 900°C, with TiO₂+Al₂O₃ mixture covering TiO₂ with dispersed Nb₂O₅. At 950°C, the oxide skin was divided into four sublayers, from the outside to the parent metal: loose TiO₂+Al₂O₃, dense Al₂O₃, dense TiO₂+Nb₂O₅, and TiO₂ matrix with dispersed Nb₂O₅. The Nb layer suppressed the outward diffusion of Ti atoms, hindering the growth of TiO₂, and simultaneously promote the formation of a continuous Al₂O₃ protective layer, providing the alloy with long-term high-temperature oxidation resistance.
- Ti–45Al–10Nb;
- elemental powder metallurgy;
- microstructure;
- high-temperature oxidation resistance

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