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Published September 1, 2005 | public
Journal Article Open

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


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.

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.


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