论文信息 - AC Modulation Calorimetry of Undercooled Liquid Ti34Zr11Cu47Ni8 and Zr57Nb5Ni12.6Al10Cu15.4: An MSL-1 Experiment Using TEMPUS

AC Modulation Calorimetry of Undercooled Liquid Ti34Zr11Cu47Ni8 and Zr57Nb5Ni12.6Al10Cu15.4: An MSL-1 Experiment Using TEMPUS

An AC modulation calorimetry (ACMC) experiment was performed on two bulk metallic glass forming alloys, Ti 34 Zr 11 CU 47 Ni 8 (VIT 101) and Zr 57 Nb 5 Ni 12.6 Al 10 Cu 15.4 (VIT 106) on the recent MSL-1 shuttle flight using the TEMPUS hardware. VIT 106 exhibited a maximum undercooling of 140 K in free radiative cooling, while VIT 101 exhibited a smaller undercooling of 50 K. Specific heat measurements were done in both the stable and undercooled liquid regions. These results will be combined with further ground-based measurements in an electrostatic levitator for modeling the nucleation kinetics of these alloys and for calculation of the free energies and entropies of the undercooled liquids in these systems.

W. Johnson | R. Wunderlich | S. C. Glade | David S. Lee

[1] W. Johnson,et al. Noncontact modulation calorimetry of metallic liquids in low Earth orbit , 1997 .

[2] W. Johnson,et al. Formation of Ti–Zr–Cu–Ni bulk metallic glasses , 1995 .

[3] A. Inoue,et al. Preparation of Bulky Zr-Based Amorphous Alloys by a Zone Melting Method , 1994 .

[4] W. Johnson,et al. A highly processable metallic glass: Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 , 1993 .

[5] Hans-Jörg Fecht,et al. A conceptual approach for noncontact calorimetry in space , 1991 .

[6] A. Sievers. Thermal radiation from metal surfaces , 1978 .

[7] David Turnbull,et al. Kinetics of Solidification of Supercooled Liquid Mercury Droplets , 1952 .