| Nb/Mn/Si合金化的β-γ钛铝合金循环氧化行为（英文） |
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| 引用本文： | 赵鹏翔,李小兵,邢炜伟,陈波,马颖澈,刘奎. Nb/Mn/Si合金化的β-γ钛铝合金循环氧化行为（英文）[J]. 中国有色金属学会会刊, 2023, 33(1): 128-140. DOI: 10.1016/S1003-6326(22)66095-3 |
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| 作者姓名： | 赵鹏翔 李小兵 邢炜伟 陈波 马颖澈 刘奎 |
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| 作者单位： | 1. 中国科学技术大学材料科学与工程学院;2. 中国科学院金属研究所师昌绪创新材料研究中心;3. 季华实验室;4. 中国科学院金属研究所核用材料与安全评价重点实验室 |
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| 基金项目： | supported by the National Natural Science Foundation of China (No. 51971215)；;the Natural Science Foundation of Liaoning Province, China (No. 2019-MS-330)； |
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| 摘 要： | 利用扫描电子显微镜、电子探针、电子背散射衍射和X射线衍射，研究Ti42Al1.5Mn3Nb0.1B合金和Ti42Al1.5Mn3Nb0.1B0.2C0.2Si合金在750～850℃下的循环氧化行为。两种合金的氧化增质曲线大致符合抛物线规律，且在800℃的氧化速率常数较Ti42Al5Mn1W合金的降低。在所有的实验温度下，两种合金表面都生成保护性良好的氧化膜，没有开裂或剥落发生。Nb的添加会抑制TiO2的生长，促进Al的选择性氧化，使合金形成致密的Al2O3层。另外，微量Si元素的添加进一步提高合金的抗氧化性，使其生成更为致密的Al2O3层，在氧化过程中进一步抑制氧的内扩散，降低合金的氧化增质，且其效果在高温下更加明显。
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| 关 键 词： | β-γ钛铝合金 循环氧化 显微组织 Mn Nb Si 合金化 |
| 收稿时间： | 2021-10-18 |
Cyclic oxidation behavior of Nb/Mn/Si alloying beta-gamma TiAl alloys |
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| Affiliation: | 1. School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China;2. Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;3. Jihua Laboratory, Foshan 528200, China;4. CAS Key Laboratory of Nuclear Materials and Safety Assessment (NMSA), Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110014, China |
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| Abstract: | Cyclic oxidation behavior at 750?850 °C was investigated for Ti42Al1.5Mn3Nb0.1B and Ti42Al1.5Mn- 3Nb0.1B0.2C0.2Si alloy by using scanning electron microscopy, electron probe microanalysis, electron backscatter diffraction and X-ray diffraction analysis. The kinetic curves for both alloys roughly follow a parabolic law, with the reduced oxidation rate constant compared to that of Ti42Al5Mn1W alloy at 800 °C. Well-protected oxide films are generated on both alloys at all experimental temperatures, without cracking or spalling of the oxide layer. The addition of Nb inhibits the growth of TiO2 and promotes the selective oxidation of Al to form a dense and protective Al2O3 layer. What is more, the addition of trace Si further promotes the oxidation resistance of the alloy, prompting the alloy to generate a denser alumina layer, which further inhibits the internal diffusion of O and reduces the oxidation mass gain, and this effect is more significant at higher temperatures. |
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| Keywords: | cyclic oxidation microstructure Mn Nb Si alloying |
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