ISSN:
1662-0356
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Natural Sciences in General
,
Technology
Notes:
The solid microstructure built in the solid governs the properties of materials elaboratedfrom the melt. In order to clarify the dynamical mechanisms controlling solidification processing,we use in situ and real-time synchrotron X-ray radiography at ESRF (European SynchrotronRadiation Facility) to analyze microstructure formation in thin aluminum alloys solidified in theBridgman facility installed at the ID19 beamline. During directional solidification of Al - 3.5 wt%Ni alloys, global mechanical constraints induced by the shape are found to act on the solidmicrostructure. In particular, radiography videos of dendritic growth show disorientations ofsidebranches induced by mechanical stresses. In the solidification of AlPdMn quasicrystals, liveimaging reveals that facetted growth proceeds by the lateral motion of ledges at the solid-meltinterface. When the solidification rate is increased, the kinetic undercooling becomes sufficient forgrain nucleation and growth in the liquid. These grains develop specific features that can beattributed to grain competition and concomitant poisoning of growth caused by the rejection ofaluminum in the melt
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.46.1.pdf
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