Published September 10, 2001
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Vitrification and determination of the crystallization time scales of the bulk-metallic-glass-forming liquid Zr58.5Nb2.8Cu15.6Ni12.8Al10.3
Abstract
The crystallization kinetics of Zr58.5Nb2.8Cu15.6Ni12.8Al10.3 were studied in an electrostatic levitation (ESL) apparatus. The measured critical cooling rate is 1.75 K/s. Zr58.5Nb2.8Cu15.6Ni12.8Al10.3 is the first bulk-metallic-glass-forming liquid that does not contain beryllium to be vitrified by purely radiative cooling in the ESL. Furthermore, the sluggish crystallization kinetics enable the determination of the time-temperature-transformation (TTT) diagram between the liquidus and the glass transition temperatures. The shortest time to reach crystallization in an isothermal experiment; i.e., the nose of the TTT diagram is 32 s. The nose of the TTT diagram is at 900 K and positioned about 200 K below the liquidus temperature.
Additional Information
Copyright © 2001 American Institute of Physics. Received 23 April 2001; accepted for publication 1 July 2001. The authors acknowledge the support of the National Aeronautics and Space Administration (Grant No. NAG8-1744) and the Department of Energy (Grant No. DEFG-03-86ER45242). Portions of this work were carried out in the electrostatic levitation facility at the NASA Marshall Space Flight Center, Huntsville, AL. The authors thank Bob Turring of Caltech's Graphics Arts Department.Files
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