ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
In the present study, the influencing factors such as the intensity and the direction ofgradient magnetic fields, the magnetic susceptibilities of non-magnetic metals on the structures arestudied theoretically and experimentally. In the theoretical analyses, the influences of high gradientmagnetic fields on nucleation and structures are investigated. In the experimental research, highgradient magnetic fields are imposed on paramagnetic material Al and diamagnetic one Sn duringtheir solidification processes. Then the macro- and microstructures of these samples are examinedand the influences of magnetic susceptibilities of metals, the intensity and the direction of highmagnetic fields are analyzed in details. It is found that solidified structures could be refined when themagnetization force and gravity were in the same directions, while the solidified structures could becoarsened and the coarse dendrites grew along the direction of the imposed magnetic fields when thedirections of these two forces were opposite. Those phenomena could be explained from the views ofreduced gravity and elevated gravity effects caused by magnetization force and the convectionsuppression effect caused by high magnetic fields. The results indicate that high magnetic fields canbe applied to control the solidified structures of metals and then improve the quality and theproperties of materials for different purposes
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1003.pdf
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