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| STUDIES OF Nb–TiAl ALLOY BY POSITRON ANNIHILATION TECHNIQUES | |
| 引用本文： | 张兰芝,王宝义,王丹妮,魏龙,林均品,王文俊.STUDIES OF Nb–TiAl ALLOY BY POSITRON ANNIHILATION TECHNIQUES[J].金属学报,2007,43(3):269-272. |
| 作者姓名： | 张兰芝 王宝义 王丹妮 魏龙 林均品 王文俊 |
| 作者单位： | 1. 中国科学院高能物理研究所核分析技术重点实验室,北京,100049;中国科学院研究生院,北京,100049 2. 中国科学院高能物理研究所核分析技术重点实验室,北京,100049 3. 北京科技大学新金属材料国家重点实验室,北京,100083 |
| 摘 要： | 利用正电子湮没寿命谱(PALS)和符合Doppler展宽(CDB)技术研究了Ti51Al49合金中Nb的掺杂效应.结果表明:低含量掺杂时,Nb原子主要偏聚在合金晶界处,提高了晶界位置的自由电子密度,有利于改善合金的室温韧性;而较高含量的Nb掺杂时,由于形成了新的晶体结构,合金基体及晶界处的自由电子密度减少,导致合金的脆性增加. |
| 关 键 词： | 正电子湮没寿命 二维符合Doppler TiAl合金 正电子湮没谱 技术研究 合金基体 掺杂效应 SPECTRUM POSITRON ANNIHILATION TiAl ALLOY DOPING EFFECT 脆性 晶体结构 高含量 室温 改善 电子密度 位置 晶界 偏聚 原子 低含量 结果 |
| 文章编号： | 0412-1961（2007）03-0269-04 |
| 收稿时间： | 2006-08-10 |
| 修稿时间： | 2006-08-102006-10-27 |
STUDY OF DOPING EFFECT OF Nb IN TiAl ALLOY BY POSITRON ANNIHILATION SPECTRUM |
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| ZHANG Lanzhi,WANG Baoyi,WANG Danni,WEI Long,LIN Junpin,WANG Wenjun.STUDY OF DOPING EFFECT OF Nb IN TiAl ALLOY BY POSITRON ANNIHILATION SPECTRUM[J].Acta Metallurgica Sinica,2007,43(3):269-272. | |
| Authors: | ZHANG Lanzhi WANG Baoyi WANG Danni WEI Long LIN Junpin WANG Wenjun |
| Affiliation: | 1. Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 ;2. Graduate School of Chinese Academy of Sciences Beijing, Beijing 100049; 3. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology, Beijing 100083 |
| Abstract: | Positron annihilation lifetime and coincidence Doppler broadening measurements have been performed for Ti51Al49 alloy with different amounts of Nb. The experimental results indicate that when a low amount of Nb atoms is added into Ti51Al49 alloy, the Nb atoms mainly aggregate at grain boundaries, which increased the free electron density at boundaries and improved the toughness at room temperature of TiAl alloys. In contrast, the densities of free electron at grain boundaries and in bulk decreased for high Nb doped alloy, due to the formation of the new ordering structure, which increases the brittleness of TiAl alloys. |
| Keywords: | positron annihilation lifetime coincidence Doppler broadening TiAl alloy |
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