Abstract
Techniques of containerless processing are applied to undercool and solidifymetals and alloys. These techniques allow direct measurements of both theundercooling and the crystal growth velocity. Experimental results arepresented for studies of nucleation of metastable crystalline phases andquasicrystals. Measurements of the dendrite growth velocity as a function ofundercooling are exemplified for dilute Ni-based alloys and intermetallics.The results are analysed within current theories of rapid crystal growth.Their consequences on the formation of grain refined microstructures arehighlighted. In addition, recent experiments on the undercooling of magneticalloys are discussed, revealing the existence of long-range magnetic orderingin an undercooled melt.
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