Electronic Resource
s.l. ; Stafa-Zurich, Switzerland
Solid state phenomena
Vol. 141-143 (July 2008), p. 433-438
ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
In order for SSM forming to produce homogeneous properties in a casting, it is importantthat there is a uniform distribution of the primary grains. Besides producing a sound casting free ofporosity, the amount of liquid segregation must be minimized. The surface liquid segregationphenomenon was investigated on high pressure die cast (HPDC) A356 alloy. SSM slurries wereprepared using the CSIR Rheocasting System and plates of 4mm × 80mm × 100mm were HPDC.The chemical composition depth profile from the surface was determined using optical emissionspectroscopy (OES) and glow discharge optical emission spectroscopy (GDOES). It was found thata 0.5-1.0 mm eutectic rich layer existed on the surface of the alloy. The thickness of the segregationlayer depended on the location on the casting. It was found that this layer was insignificant close tothe gate of the casting but was relatively consistent over most of the plate. Although thissegregation layer did not impact on the bulk mechanical properties, hardness tests did reveal thatthis region had significantly higher hardness values which may have a considerable impact on thefatigue properties
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.433.pdf
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