Alternative TitleStudy on the transformation between W′ and W phases in Mg-Zn-Y alloy
刘建方; 杨志卿; 叶恒强
Source Publication电子显微学报
AbstractMg?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 AbstractBoth 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 ByCSCD
Citation statistics
Cited Times:2[CSCD]   [CSCD Record]
Document Type期刊论文
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
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[刘建方]'s Articles
[杨志卿]'s Articles
[叶恒强]'s Articles
Baidu academic
Similar articles in Baidu academic
[刘建方]'s Articles
[杨志卿]'s Articles
[叶恒强]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[刘建方]'s Articles
[杨志卿]'s Articles
[叶恒强]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.