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Solid State Reactions in the ZR-AL-CU-NI Bulk Metallic Glass Forming Alloy System

Published online by Cambridge University Press:  15 February 2011

Ralf Busch ,
Eric Bakke  and
William L. Johnson
Ralf Busch
Affiliation:
California Institute of Technology, WMKeck Laboratory of Engineering Materials, 138-78, Pasadena, CA 91125
Eric Bakke
Affiliation:
California Institute of Technology, WMKeck Laboratory of Engineering Materials, 138-78, Pasadena, CA 91125
William L. Johnson
Affiliation:
California Institute of Technology, WMKeck Laboratory of Engineering Materials, 138-78, Pasadena, CA 91125
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Abstract

Diffusion couples combining a h.c.p. Zr90Al10 supersaturated solid solution with a fc.c. Cu64Ni36 solid solution were annealed at 410°C for different times. The reaction at the interface was investigated by transmission electron microscopy (TEM) and energy dispersive x-ray spectroscopy (EDAX). Cross sectional TEM images and electron diffraction patterns reveal the formation of a non-crystalline layer at the interface between the two solid solutions which grows to a maximum thickness of more than 0.3 μm. Using EDAX, the concentration profiles across the layerswere determined. The glassy layer consists of a Zr-Ni-Al alloy with a small amount of Cu.The concentration profiles reveal that two non-crystalline phases coexist in the diffusion couple. One phase is Ni-rich and the other is Zr-rich. A small gradient of the Ni concentration in the Ni-rich amorphous phase and a steeper gradient in the Zr-rich non crystalline phase indicate that the Ni diffusion constant in the Ni-rich phase is larger than the Ni diffusion constant in the Zr-rich phase. In the late stage of the reaction, the growth of a nanocrystalline layer with an average concentration of Cu 90Nij 0 is observed on the Cu-Ni side of the diffusion couple. Crystallization starts at the Zr-Al side of the diffusion couple.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 382: Symposium G – Structure and Properties of Multilayered Thin Films , 1995 , 63
Copyright
Copyright © Materials Research Society 1995

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