ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
ECAP (equal channel angular pressing) is a well-known severe plastic deformationmethod used to produce ultra-fine grained materials. The dimensions of ECAP specimens areusually in the centimeter range. For producing high strength wires or fibres with diameter in themicrometer/millimeter range, downscaling of the ECAP process may be a viable option. To achievethis, several experiments were carried out. For downscaling to the micrometer range, porous steeldiscs can be used as processing tools. In this case, a solid state infiltration method as a variant ofthe forcefill process can be used. Extremely large strain is introduced due to the material flowthrough the tortuous channels inside a porous pre-form leading to grain refinement depending onprocessing conditions. To obtain specimens with a typical dimension in the millimeter range, theforcefill approach was altered by using die channels produced by conventional drilling. The toolgeometry used is equivalent to conventional ECAP, but with a multi-channel die. Microstructureinvestigations demonstrating significant grain refinement confirm the viability of this approach
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.114.265.pdf
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