Hostname: page-component-77c89778f8-rkxrd Total loading time: 0 Render date: 2024-07-21T21:13:11.027Z Has data issue: false hasContentIssue false
  • English
  • Français

Phase Transformations in Cu-Zr Multilayers

Published online by Cambridge University Press:  21 February 2011

T.T. Weihs ,
T.T. Barbee Jr.  and
M.M. Wall
T.T. Weihs
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
T.T. Barbee Jr.
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
M.M. Wall
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
Get access

Abstract

A study of phase transformations is reported for Cu-rich, Cu-Zr multilayer foils that were synthesized using magnetron sputter deposition and annealed using a differential scanning calorimeter. The foils range in composition from 1.6 at% to 9.0 at% Zr and consist of alternate layers of polycrystalline Cu and Zr. Differential scanning calorimetry, X-ray analysis and electron microscopy were used to examine three distinct reactions in the foils: a mixing and an amorphization of the Cu and the Zr, a crystallization to the metastable intermetallic, Cu51Zr14, and a transformation of the Cu51Zr14 phase into the equilibrium phase, Cu9Zr2. The asdeposited layering remained stable during the first two reactions and then broke down in the third reaction as large grains of Cu9Zr2 encompassed the smaller Cu grains. The heats of the reactions and the activation energies of these reactions are measured and are compared to values reported for bulk samples. The measured heats support the observation that amorphous Cu-Zr alloys phase separate and provide evidence that mixing and short range ordering produce 3.5 times more heat than long range ordering when Cu and Zr react and form Cu51Zr14.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 311: Symposium O – Phase Transformations in Thin Films–Thermodynamics and Kinetics , 1993 , 85
Copyright
Copyright © Materials Research Society 1993

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1) Kneller, E., Khan, Y., Gorres, U., Z. Metallkd., 77, 43 (1986).Google Scholar
2) Johnson, W.L, Mater. Sci. Eng., 97, 1 (1988).CrossRefGoogle Scholar
3) Barbee, T.W. Jr., Walmsley, R.G., Marshall, A.F., Keith, D.L., and Stevenson, D.A., Appl. Phys. Lett., 38, 132 (1981).Google Scholar
4) Weihs, T.P., Barbee, T.W. Jr., Wall, M.A., MRS Symposium Ml, Spring '93 Meeting.Google Scholar
5) Marshall, A.F., Walmsley, R.G., and Stevenson, D.A., Mater. Sci. Eng., 63, 215 (1984).CrossRefGoogle Scholar
6) Kleppa, O.J. and Wanatabe, S., Metall. Trans. B, 13, 391 (1982).Google Scholar
7) Chen, L.C. and Spaepen, F., J. Appl. Phys., 69, 679 (1991).Google Scholar
8) Bormann, R., Gartner, F. and Haider, F., Mater. Sci. Eng., 97, 79 (1988).CrossRefGoogle Scholar
9) Porter, D. A. and Easterling, K.E., Phase Transformations in Metals and Alloys. Van Nostrand Reinhold, UK, 1981.Google Scholar
10) Kissinger, H.E., Anal. Chem., 29, 1702 (1957).Google Scholar
11) Buschow, K.H.J., J. Appl. Phys., 52, 3319 (1981).CrossRefGoogle Scholar