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Heterogeneous nucleation in a glass-forming alloy

Wall, J. J. and Liu, C. T. and Rhim, W. K. and Li, J. J. Z. and Liaw, P. K. and Choo, H. and Johnson, W. L. (2008) Heterogeneous nucleation in a glass-forming alloy. Applied Physics Letters, 92 (24). Art. No. 244106. ISSN 0003-6951. doi:10.1063/1.2948861.

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Nucleation in the undercooled liquid state in the bulk metallic glass-forming composition Zr52.5Cu17.9Ni14.6Al10Ti5 (VIT-105), produced using high purity (PA) and commercial purity (CA) raw materials was investigated using electrostatic levitation and ex situ neutron diffraction. The CA material was observed to have a lower density than the PA sample and crystallized at relatively shallow undercooling. The densities of the samples at temperatures above the solidus showed an oxygen-dependent hysteresis associated with the state change, indicating the presence of oxygen-stabilized intermetallics. The PA alloy exhibited three distinct crystallization modes dependent on the thermal history of the melt, one of which showed a net volume expansion.

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Additional Information:© 2008 American Institute of Physics. Received 6 May 2008; accepted 30 May 2008; published 20 June 2008.
Subject Keywords:aluminum alloys, copper alloys, crystallization, liquid alloys, metallic glasses, neutron diffraction, nickel alloys, titanium alloys, undercooling, vitrification, zirconium alloys
Issue or Number:24
Record Number:CaltechAUTHORS:WALapl08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10952
Deposited By: Archive Administrator
Deposited On:20 Jun 2008
Last Modified:08 Nov 2021 21:12

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