Mechanism of Zirconium Poisoning Effect on TiB2 Inoculation in Aluminium Alloys View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

2016

AUTHORS

Yun Wang , Li Zhou , Zhongyun Fan

ABSTRACT

It was found that the efficiency of TiB2 inoculation to achieve grain refinement was decreased dramatically by Zr addition. In the present work, the mechanism of so-called “poisoning” effect was investigated by advanced analytical microscopy, including Cs-corrected high resolution STEM. For the first time, adsorption of Zr atoms was observed in a mono-layer on {0001} surface of TiB2. Significantly, atomic resolution STEM Z-contrast imaging revealed that the brightness of atomic columns in the monolayer varied periodically when viewing in \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$[10\bar 10]$$\end{document} direction, indicating that the adsorbed Zr atoms in the layer were ordered in 2D. Deviation by 8 degrees from the well define orientation relationship, (0001)TiB2 8deg ~ (111)Al, and \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${[11\bar 20]_{TiB2}}\parallel {[0\bar 11]_{A1}}$$\end{document}, was observed. The effect of Zr atom adsorption at the interface on mechanism of heterogeneous nucleation was discussed. More... »

PAGES

725-729

Book

TITLE

Light Metals 2016

ISBN

978-3-319-48615-4
978-3-319-48251-4

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-3-319-48251-4_122

DOI

http://dx.doi.org/10.1007/978-3-319-48251-4_122

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1021783392


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