| 北京科技大学 新金属材料国家重点实验室，北京100083 |
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| 引用本文： | 李光燕,赵丽利,张来启,林均品,陈国良. 北京科技大学 新金属材料国家重点实验室，北京100083[J]. 稀有金属材料与工程, 2011, 40(6): 1000-1004 |
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| 作者姓名： | 李光燕 赵丽利 张来启 林均品 陈国良 |
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| 作者单位： | 北京科技大学,新金属材料国家重点实验室,北京,100083 |
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| 基金项目： | 国家自然科学基金(50771013，50871127) |
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| 摘 要： | 利用SEM、XRD和EDS研究Y对Ti45Al8Nb(at%)合金在900℃空气中的循环氧化行为的影响。实验结果表明,适量Y的加入显著提高了合金的抗循环氧化性。无Y合金300次循环后便出现了表层氧化膜脱落,而含Y的6个合金除Ti45Al8Nb0.1Y在氧化460h后出现大面积脱落外,其余合金在1000次循环内均未出现明显脱落。Y的加入显著增强了氧化膜与基体之间的粘附性。但是加入过量Y,合金氧化膜内颗粒较大的Y2O3偏聚在晶界处,为O提供了扩散通道,使合金出现了严重的内氧化。
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| 关 键 词： | 钛铝合金 高温循环氧化 Y含量 |
| 收稿时间： | 2010-06-08 |
State Key Laboratory for Advanced Metals and Materials, University of Science & Technology Beijing, Beijing 100083, China |
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| Li Guangyan,Zhao Lili,Zhang Laiqi,Lin Junpin and Chen Guoliang. State Key Laboratory for Advanced Metals and Materials, University of Science & Technology Beijing, Beijing 100083, China[J]. Rare Metal Materials and Engineering, 2011, 40(6): 1000-1004 |
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| Authors: | Li Guangyan Zhao Lili Zhang Laiqi Lin Junpin Chen Guoliang |
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| Affiliation: | State Key Laboratory for Advanced Metals and Materials, University of Science & Technology Beijing, Beijing 100083, China |
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| Abstract: | The influence of Y addition on cyclic oxidation behaviors of Ti45Al8Nb alloys (at%) was investigated in air at 900 oC by SEM, XRD and EDS. Results show that proper Y addition can markedly increase cyclic oxidation resistance of the alloys. The grain sizes are gradually decreased with the increasing Y content. In cyclic oxidation tests all Y added alloys except Ti45Al8Nb0.1Y show no obvious scale spallation after 1000 cycles while Y free alloy shows serious spallation even after 300 cycles. Y addition enhances the adhesion between the oxide film and the substrate. However, alloys with excessive Y suffer severe internal oxidation by providing rapid diffusion paths for O in the form of coarse Y2O3 particles at oxide grain boundary. |
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| Keywords: | titanium aluminides high-temperature cyclic oxidation Y content |
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