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Undercooling Experiments in a High Temperature Differential Scanning Calorimeter

Published online by Cambridge University Press:  21 February 2011

M. Baricco,
E. Ferrari and
L. Battezzati
M. Baricco
Affiliation:
Dipartimento di Chimica Inorganica, Chimica Fisica e Chimica dei Materiali, Università di Torino, Via P.Giuria, 9 -1–10125 TORINO (Italy), baricco@ch.unito.it
E. Ferrari
Affiliation:
Dipartimento di Chimica Inorganica, Chimica Fisica e Chimica dei Materiali, Università di Torino, Via P.Giuria, 9 -1–10125 TORINO (Italy), baricco@ch.unito.it
L. Battezzati
Affiliation:
Dipartimento di Chimica Inorganica, Chimica Fisica e Chimica dei Materiali, Università di Torino, Via P.Giuria, 9 -1–10125 TORINO (Italy), baricco@ch.unito.it
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Abstract

Several samples of metals and alloys have been undercooled during scanning in a high temperature DSC. Liquid Ni was undercooled of about 230 K when previously fluxed in molten B2O3. From enthalpy data of melting and solidification as a function of temperature, the excess heat capacity of liquid metals and alloys was evaluated. The specific heat of the liquid is definitely higher than that of the corresponding crystalline phases for glass-forming alloys, whereas it is close to that of the solid for pure metals. The Ni-B system has been studied in detail around the Ni-Ni3B eutectic. On undercooling, a new metastable phase (Ni23B6) was produced. A metastable Ni-B phase diagram has been drawn using data of thermal analysis of several alloys containing the metastable phase.

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References

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