Abstract
The specific heat and dendritic growth of highly undercooled peritectic Fe-Cu alloys were investigated by electromagnetic levitation technique. The specific heat values of liquid peritectic Fe92.8Cu7.2 and hyperperitectic Fe88.5Cu11.5 alloys were determined to be 40.4 and 39.58J·mol−1·K−1 over wide temperature ranges. The measured growth velocities rose rapidly with increasing undercooling, which reached 69 and 68m·s−1 at the maximum undercoolings of 401K (0.23 TL) and 468K (0.27 TL). The microstructures of peritectic Fe-Cu alloys were refined significantly with enhanced undercooling. Theoretical analyses showed that almost segregationless solidification was realized if undercooling was sufficiently large.
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