Effects of Nb and Si on densities of valence electrons in bulk and defects of Fe3Al alloys
文献类型：期刊论文
| 作者 | W. Deng ; X. P. Zhong ; Y. Y. Huang ; L. Y. Xiong ; S. H. Wang ; J. T. Guo ; Q. W. Long |
| 刊名 | Science in China Series a-Mathematics Physics Astronomy
 |
| 出版日期 | 1999 |
| 卷号 | 42期号:1页码:87-92 |
| 关键词 | positron lifetime Fe3Al alloy alloying element microdefect density of valence electron positron fracture |
| ISSN号 | 1006-9283 |
| 中文摘要 | Positron lifetime measurements have been performed in binary Fe3Al and Fe3Al doping with Nb or Si alloys. The densities of valence electrons of the bulk and microdefects in all tested samples have been calculated by using the positron lifetime parameters. Density of valence electron is low in the bulk of Fe3Al alloy. It indicates that, the 3d electrons in a Fe atom have strong-localized properties and tend to form covalent bonds with Al atoms, and the bonding nature in Fe3Al is a mixture of metallic and covalent bonds. The density of valence electron is very low in the defects of Fe3Al grain boundary, which makes the bonding cohesion in grain boundary quite weak. The addition of Si to Fe3Al gives rise to the decrease of the densities of valence electrons in the bulk and the grain boundary thus the metallic bonding cohesion. This makes the alloy more brittle. The addition of Nb to Fe3Al results in the decrease of the ordering energy of the alloy and increases the density of valence electron and the bonding cohesion of the grain boundary. However, since the radius of Nb atom is larger than that of Fe atom, when Nb atoms substitute for Fe atoms, they will distort the lattice and enlarge the volume of the lattice, which decreases the density of valence electron and the cohesion of metallic bond in the bulk of the alloy. |
| 原文出处 | |
| 公开日期 | 2012-04-14 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/37343]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | W. Deng,X. P. Zhong,Y. Y. Huang,et al. Effects of Nb and Si on densities of valence electrons in bulk and defects of Fe3Al alloys[J]. Science in China Series a-Mathematics Physics Astronomy,1999,42(1):87-92. |
| APA | W. Deng.,X. P. Zhong.,Y. Y. Huang.,L. Y. Xiong.,S. H. Wang.,...&Q. W. Long.(1999).Effects of Nb and Si on densities of valence electrons in bulk and defects of Fe3Al alloys.Science in China Series a-Mathematics Physics Astronomy,42(1),87-92. |
| MLA | W. Deng,et al."Effects of Nb and Si on densities of valence electrons in bulk and defects of Fe3Al alloys".Science in China Series a-Mathematics Physics Astronomy 42.1(1999):87-92. |
入库方式： OAI收割
来源：金属研究所
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