Manufacturing of functionally graded metal matrix composite materials by segregation

authored by: Bernd Arno Behrens, Dieter Bohr
Abstract: By applying vibrations to a granular media differing in size and density, various segregation states can be established. If an additional rotational motion is engaged, the effective force is no longer gravity but a centrifugal one, leading to a radial segregation. In this contribution, an experimental setup is presented which utilizes these effects. This setup is used to produce a cylindrical metal matrix composite consisting of silicon carbide and aluminium having a radial gradient. The influence of different material- and process-specific parameters on the segregation behaviour was investigated. The evaluation of micrographs of the pressed and sintered samples shows that both positive and negative gradients can be achieved. The rotation speed and the grain size ratio were identified as significant factors. The variation of the vibration amplitude leads to opposite effects. On the one hand, the gradient intensity increased. On the other hand, the variances of the SiC distribution in the tangential or radial directions increased as well. In addition, it has been shown that the effects of different grain shapes are marginal.
Organisation(s): Institute of Metal Forming and Metal Forming Machines
Type: Article
Journal: International Journal of Materials Research
Volume: 109
Pages: 373-380
No. of pages: 8
ISSN: 1862-5282
Publication date: 15.05.2018
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Condensed Matter Physics, Physical and Theoretical Chemistry, Metals and Alloys, Materials Chemistry
Electronic version(s): https://doi.org/10.3139/146.111619 (Access: Closed)
: Details in the research portal "Research@Leibniz University"

BibTeX

@article{714e3433d3e148da8394286670d7f5a9,
title = "Manufacturing of functionally graded metal matrix composite materials by segregation",
abstract = "By applying vibrations to a granular media differing in size and density, various segregation states can be established. If an additional rotational motion is engaged, the effective force is no longer gravity but a centrifugal one, leading to a radial segregation. In this contribution, an experimental setup is presented which utilizes these effects. This setup is used to produce a cylindrical metal matrix composite consisting of silicon carbide and aluminium having a radial gradient. The influence of different material- and process-specific parameters on the segregation behaviour was investigated. The evaluation of micrographs of the pressed and sintered samples shows that both positive and negative gradients can be achieved. The rotation speed and the grain size ratio were identified as significant factors. The variation of the vibration amplitude leads to opposite effects. On the one hand, the gradient intensity increased. On the other hand, the variances of the SiC distribution in the tangential or radial directions increased as well. In addition, it has been shown that the effects of different grain shapes are marginal.",
keywords = "Brazil nut effect (BNE), Functionally graded materials (FGM), Metal matrix composite (MMC), Powder metallurgy (PM)",
author = "Behrens, {Bernd Arno} and Dieter Bohr",
note = "{\textcopyright} 2018, Carl Hanser Verlag, M{\"u}nchen",
year = "2018",
month = may,
day = "15",
doi = "10.3139/146.111619",
language = "English",
volume = "109",
pages = "373--380",
journal = "International Journal of Materials Research",
issn = "1862-5282",
publisher = "Carl Hanser Verlag GmbH & Co. KG",
number = "5",
}