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Can Amortization Bs Induced by Ion Mixing in Ag-Cu and Ag-Ni Systems?

Published online by Cambridge University Press:  26 February 2011

B. X. Liu ,
L. J. Huang ,
J. Li  and
S. Ma
B. X. Liu
Affiliation:
Department of Engineering Physica, Tsinghua University, Beijing, CHINA
L. J. Huang
Affiliation:
Department of Engineering Physica, Tsinghua University, Beijing, CHINA
J. Li
Affiliation:
Department of Engineering Physica, Tsinghua University, Beijing, CHINA
S. Ma
Affiliation:
Department of Engineering Physica, Tsinghua University, Beijing, CHINA
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Abstract

The extended Structural Difference Rule for amorphous phase formation states that an amorphous phase can be obtained by ion mixing with an alloy with a composition lying in a two-phase region in the equilibrium phase diagram. This criterion has to respond to the challenge that no amorphous alloy has been formed in some early studied systems exhibiting a two-phase region character, e.g. Ag-Cu(typical eutec-tic),Ag-Ni(almost entirely immiscible),etc‥

We performed ion mixing experiments for several systems at liquid nitrogen temperature using Xe ions with low current density. Amorphization was indeed observed in both Ag-Cu and Ag-Ni samples, as two halos were seen by TEM SAD immediately after adequate doses ion mixing. These not only support our two-pnase region rule, but also show the possibility of amorphization in a system(Ag-Ni) that has large positive heat of formation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 54 , 1985 , 215
Copyright
Copyright © Materials Research Society 1986

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References

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