Digitale Medien
s.l. ; Stafa-Zurich, Switzerland
Solid state phenomena
Vol. 141-143 (July 2008), p. 271-276
ISSN:
1662-9779
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Physik
Notizen:
Wrought aluminum alloys have wide variety applications in aerospace and automobileindustries, due to their superior properties compared to casting aluminum alloys. Rheoforging is amodification of thixoforging, which starts directly from the liquid phase instead of reheating of abillet. In the present process, suitable semi-solid slurries of wrought aluminum alloys are prepared bythe LSPSF (low superheat pouring with a shear field) rheocasting process within 25s. The effects ofprocessing conditions on the degree of spherical grain refinement in 2024, 6082 and 7075 alloys arediscussed. 2024 and 7075 alloys have been used in order to investigate rheoformability of highperformance aluminum alloy. Experimental results show that rheoforging based on LSPSF processcan produce relatively homogeneous microstructure throughout the cup-shaped component. However,high solid fraction of semi-solid slurry promotes metal flow and results in solid/liquid segregation.Subsequent optimized heat treatments raise significantly the mechanical properties. Future potentialsand challenges to be solved are discussed
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.271.pdf
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