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:
The effect of size refinement of primary silicon and modification of eutectic silicon,separately and simultaneously, on microstructure of hypereutectic Al-20wt%Si has beeninvestigated under different casting conditions. Results showed that number per unit volume ofprimary silicon particles was doubled by inoculation with 0.02% phosphorus in the alloy with0.0015% phosphorus already in it, whereas 70% of a small ingot (40×35 mm) became modifiedeutectic, and the formation of primary silicon was suppressed, on adding 0.1% strontium.Simultaneous addition of phosphorus and strontium still refined the primary silicon but did notmodify the eutectic. Addition of strontium alone caused roughening of the primary silicon,exemplified by increased undercooling registered on the cooling curve. Also crystallographicrelationships between polyhedral primary silicon particles have been investigated by Electron BackScattered Diffraction (EBSD)
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.1741.pdf
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