Electronic Resource
s.l. ; Stafa-Zurich, Switzerland
Solid state phenomena
Vol. 116-117 (Oct. 2006), p. 1-8
ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
The essential first step in semi-solid forming is to obtain a high graindensity during the initial stages of solidification of an alloy melt. This is usually doneby a combination of cooling and convection. If the grain density is too low, theresulting structure is one of conventional coarse dendrites, unsuitable for semi-solidforming. At higher grain densities, fine dendrites grow that can be coarsened to aspheroidal structure in a short enough time to be of practical interest for semi-solidforming. If the initial grain density is still higher, the grains grow in a fully spheroidalmanner. Thus there are two distinctly different paths to formation of the desiredstructure: 1) coarsening of fine dendrites, and 2) direct spheroidal growth. We arebeginning to understand quantitatively the conditions necessary to form spheroids inthese two different ways
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.116-117.1.pdf
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