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:
Rapid solidification processes, RSP, are powerful tools to induce microstructuralmodifications, which may improve mechanical properties of alloys. In this paper the influence ofrapid solidification on the formation of the undesirable brittle intermetallic compounds promoted bySi and Fe in Al-6Si-3Cu (A319-type) alloy have been investigated. The alloy have been castedusing both conventional method and water-cooled wedge-copper mould. The microstructures havebeen evaluated by using a combination of X-ray diffraction, optical, scanning and transmissionelectron microscopy, and by Vickers microhardness. By increasing the cooling rate the length of theintermetallic β-Al5FeSi phase decreased, accompanying the same tendency of the secondarydendritic arm spacing. These results are accompanied by an increasing in hardness. Moreover, theformation and growth of the Al2Cu phase have been suppressed. These microstructural and hardnesschanges with the rapid solidification might be attributed to the increased solid solution content ofthe elements in the Al matrix
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.570.103.pdf
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