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Interfacial instability-driven amorphization/nanocrystallization in a bulk Ni45Cu5Ti33Zr16Si1 alloy during solidification

Kim, Ki Buem and Yi, Seonghoon and Choi-Yim, Haein and Das, Jayanta and Johnson, William L. and Eckert, Jürgen (2005) Interfacial instability-driven amorphization/nanocrystallization in a bulk Ni45Cu5Ti33Zr16Si1 alloy during solidification. Physical Review B, 72 (9). Art. No. 092102. ISSN 1098-0121. doi:10.1103/PhysRevB.72.092102.

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We report on experimental evidence for local amorphization/nanocrystallization at the interfaces between the B2-ordered Ni(Ti,Zr) phase and the NiTiZr phase with P63/mmc during solidification of a multicomponent Ni45Cu5Ti33Zr16Si1 alloy. So far there are several well-known mechanisms for interfacial amorphization in the solid state but no interfacial instability-driven amorphization/nanocrystallization during transition from liquid to solid state has been reported to our knowledge. The curvature of the interfacial area of the ordered Ni(Ti,Zr) phase is locally negative accompanying reverse atomic diffusion. This results in the frustration of the strong ordering tendency of the Ni(Ti,Zr) phase, and induces local amorphization/nanocrystallization.

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Additional Information:©2005 The American Physical Society (Received 18 July 2005; published 22 September 2005) The authors thank F. Baier, G. Miehe, C. Müller, and R. Theissmann for technical assistance and stimulating discussions, and U. Kunz for TEM sample preparation. Funding by the EU within the framework of the Research Training Network on ductile bulk metallic glass composites (Grant No. MRTN-CT-2003-504692) is gratefully acknowledged.
Subject Keywords:nickel alloys; copper alloys; titanium alloys; zirconium alloys; silicon alloys; amorphisation; nanostructured materials; crystallisation; solidification; frustration; liquid alloys; metallic glasses
Issue or Number:9
Record Number:CaltechAUTHORS:KIMprb05
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4707
Deposited By: Archive Administrator
Deposited On:03 Sep 2006
Last Modified:08 Nov 2021 20:19

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