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Decomposition and primary crystallization in undercooled Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 melts

Busch, R. and Schneider, S. and Peker, A. and Johnson, W. L. (1995) Decomposition and primary crystallization in undercooled Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 melts. Applied Physics Letters, 67 (11). pp. 1544-1546. ISSN 0003-6951. http://resolver.caltech.edu/CaltechAUTHORS:BUSapl95a

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Abstract

Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 bulk metallic glasses were prepared by cooling the melt with a rate of about 10 K/s and investigated with respect to their chemical and structural homogeneity by atom probe field ion microscopy and transmission electron microscopy. The measurements on these slowly cooled samples reveal that the alloy exhibits phase separation in the undercooled liquid state. Significant composition fluctuations are found in the Be and Zr concentration but not in the Ti, Cu, and Ni concentration. The decomposed microstructure is compared with the microstructure obtained upon primary crystallization, suggesting that the nucleation during primary crystallization of this bulk glass former is triggered by the preceding diffusion controlled decomposition in the undercooled liquid state.


Item Type:Article
Additional Information:©1995 American Institute of Physics. (Received 19 April 1995; accepted 5 July 1995) We would like to thank R. Kirchheim for giving us the opportunity to use the AP/FIM in Go¨ttingen, D. Isheim and A. Pundt for their assistance with the AP/FIM, and C. Garland for her assistance with the TEM experiments. This work was supported by the Alexander von Humboldt Foundation via the Feodor Lynen Program and by the U.S. Department of Energy (Grant No. DEFG-03-86ER45242).
Subject Keywords:BERYLLIUM ALLOYS; CHEMICAL COMPOSITION; COPPER ALLOYS; DECOMPOSITION; DIFFUSION; FLUCTUATIONS; ION MICROSCOPY; LIQUIDS; METALLIC GLASSES; MICROSTRUCTURE; NICKEL ALLOYS; NUCLEATION; PHASE TRANSFORMATIONS; SUBCOOLING; TITANIUM ALLOYS; TRANSMISSION ELECTRON MICROSCOPY; ZIRCONIUM ALLOYS; PHASE SEPARATION
Record Number:CaltechAUTHORS:BUSapl95a
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:BUSapl95a
Alternative URL:http://dx.doi.org/10.1063/1.114487
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1909
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:23 Feb 2006
Last Modified:26 Dec 2012 08:46

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