| Mg-Zn-Y合金中W′相与W相的相变研究 | |
| Alternative Title | Study on the transformation between W′ and W phases in Mg-Zn-Y alloy |
| 刘建方; 杨志卿; 叶恒强 | |
| 2015 | |
| Source Publication | 电子显微学报
 |
| ISSN | 1000-6281 |
| Volume | 34.0Issue:1.0Pages:1-6 |
| Abstract | Mg？Zn？Y合金中面心立方结构的W′和W相均与二十面体准晶（ IQC）相有密切联系，但W′相的结构还存在争议。综合利用电子衍射分析、能谱分析和像差校正扫描透射电子显微术，确定 W′相的化学成分为Zn60？1 Mg23？9 Y16，具有Cd45 Sm11型结构，内部存在四面体对称的Friauf多面体原子团簇而非二十面体对称团簇，因此W′相不宜称为IQC相的近似相。利用原位加热透射电子显微术研究发现W′相在683 K可转变为W相。二者具有立方－立方取向关系，且W′／W界面具有良好的外延性。热激活作用下原子的扩散和平移引起W相在W′上外延形核长大。 |
| Other Abstract | Both face-centered cubic phases W′and W have close relationship with the icosahedral quasicrystal （ IQC） phase in Mg-Zn？Y alloys, but the crystal structure of W′ phase remains controversial. Based on electron diffraction analysis, energy dispersive X-ray spectroscopy and aberration-corrected scanning transmission electron microscopy （ STEM） , it can be concluded that the W′phase has a composition of Zn60？1 Mg23？9 Y16 and which is identified as the Cd45 Sm11？type structure. The W′ phase is composed of tetrahedral symmetric Friauf polyhedral clusters rather than icosahedral symmetric multiple-shell ones, so the W′ phase is not an approximant crystal of IQC. By in situ heating transmission electron microscopy （ TEM） , a phase transformation from W′to W was observed at 683 K in the as-cast alloy. The W′and W phases have a cube-to？cube orientation relationship, and the W′/W interface is coherent. Close correlation between their basic structural units, cuboctahedral and Friauf clusters, is believed to be responsible for the epitaxial nucleation and growth of W phase on the W′phase. |
| Keyword | 镁合金 二十面体准晶 原位透射电子显微学 像差校正扫描透射电子显微学 相变 |
| Indexed By | CSCD |
| Language | 中文 |
| CSCD ID | CSCD:5360393 |
| Citation statistics |
Cited Times:2[CSCD]
[CSCD Record]
|
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/152075 |
| Collection | 中国科学院金属研究所 |
| Affiliation | 中国科学院金属研究所 |
| Recommended Citation GB/T 7714 | 刘建方,杨志卿,叶恒强. Mg-Zn-Y合金中W′相与W相的相变研究[J]. 电子显微学报,2015,34.0(1.0):1-6. |
| APA | 刘建方,杨志卿,&叶恒强.(2015).Mg-Zn-Y合金中W′相与W相的相变研究.电子显微学报,34.0(1.0),1-6. |
| MLA | 刘建方,et al."Mg-Zn-Y合金中W′相与W相的相变研究".电子显微学报 34.0.1.0(2015):1-6. |
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