High undercooling of Ni[sub 59]Nb[sub 41] alloy in a containerless electrostatic levitation facility

Robinson, M.B.; Robinson, M. B.; Li, D.; Rogers, J. R.; Rogers, J.R.; Hyers, R. W.; Hyers, R.W.; Savage, L.; Rathz, T. J.
November 2000
Applied Physics Letters;11/13/2000, Vol. 77 Issue 20
Academic Journal
Utilizing the containerless electrostatic levitation facility at NASA/MSFC, we were able to undercool the Ni[sub 59]Nb[sub 41] (atomic) alloy by 210 K which was 160° farther than the results of previous flight experiments. Undercoolings were clustered around 200 K during the repeated melting-freezing cycles on a single sample. Prior to this work, a metastable liquid separation had been presumed to limit the undercooling of this alloy. However, microstructural observations have revealed that undercooling was limited by crystal nucleation. © 2000 American Institute of Physics.


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