Specific heat capacity and dendritic growth kinetics of liquid peritectic Fe-Cu alloys

• DOI: 10.1016/j.cplett.2016.06.059
• Publication Date: 2016-06-27T07:00:32Z
• Authors: Z.C. Xia; W.L. Wang; S.B. Luo; B. Wei
• Keywords: Supercooling; Magnetic Levitation; Dendrite (mathematics)

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 Fe 92.8 Cu 7.2 and hyperperitectic Fe 88.5 Cu 11.5 alloys were determined to be 40.4 and 39.58 J·mol −1 ·K −1 over wide temperature ranges. The measured growth velocities rose rapidly with increasing undercooling, which reached 69 and 68 m·s −1 at the maximum undercoolings of 401 K (0.23 T L ) and 468 K (0.27 T L ). 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.