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Alloying in an Immiscible Cu-Nb System upon Solid-State Reaction

Published online by Cambridge University Press:  21 February 2011

F. Pan ,
Z.F. Ling ,
K.Y. Gao  and
B.X. Liu
F. Pan
Affiliation:
Currently on leave at Louisiana State University, Department of Mechanical Engineering, Baton Rouge, LA70803
Z.F. Ling
Affiliation:
Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
K.Y. Gao
Affiliation:
Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
B.X. Liu
Affiliation:
Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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Abstract

In an immiscible Cu-Nb system, an amorphous alloy and two metastable crystalline phases were obtained by solid-state reaction of Cu-Nb multilayered films, and the formation of the alloy phases was found to be quite sensitive to the average composition of the films. At Nb concentration of 75at%, amorphization was achieved by 250°C annealing for 50 min, while in the films with compositions of 70 and 80 at% Nb, a simple cubic (a=0.405±0.005nm) and an orthorhombic phase (a=0.421, b=0.334, c=0.291±0.005nm) were observed, respectively. Thermodynamic calculation was conducted for the Nb-Cu alloy phases and the energetic state of the multilayers, which consisted of 9 Cu/Nb bilayers. It turned out that the excess free energy originating from the interfacial atoms could raise the multilayers to an energy level being higher than that of the amorphous or/and metastable crystalline phases both with a convex shape, and thus provided a major driving force for alloy phase formation in such immiscible system.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 398: Symposium C – Thermodynamics and Kinetics of Phase Transformations , 1995 , 337
Copyright
Copyright © Materials Research Society 1998

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References

REFERENCES

1 Zhang, Z.J. and Liu, B.X., Phys.Rev.B 51, 8076(1995).Google Scholar
2 Veltl, G., Scholz, B., and Kunze, H.-D., Material Science and Engineering, A134, 1410(1991).Google Scholar
3 Mizutani, U. and Lee, C.H., Mater. Trans. JIM, 36, 210(1995)Google Scholar
4 Schwarz, R.B. and Johnson, W.L., Phys.Rev.Lett. 51, 415(1983).Google Scholar
5 Ma, E., Atzmon, M., and Pinkerton, F., J.Appl.Phys. 74, 955(1993).Google Scholar
6 Pan, F., Chen, Y.G., and Liu, B.X., Appl.Phys.Lett. 67, 780(1995).Google Scholar
7 Liu, B.X. and Zhang, Z.J., Phys.Rev.B 49 12519(1994).Google Scholar
8 Veltl, G., Scholz, B., and Kunze, H.-D., Mater. Sci. Eng. A134, 1410(1991); K.Sakurai, Y.Yamada, C.H.Lee, T.Fukunaga, and U.Mizutani, Mater. Sci. Eng. A134, 1414(1991).Google Scholar
9 de Boer, F.R., Boom, R., Matters, W.C.M., Miedema, A.R., and Niessen, A.K., Cohesion in Metals: Transition Metal Alloy (North-Holland, Amsterdam, 1990), Chap.III.Google Scholar
10 Swalin, R.A., Thermodynamics of Solids, 2nd ed.(John wiley and Sons, New York, 1972), p.244 Google Scholar
11 Niessen, A.K. and Miedema, A.R., Ber.Bunsenges.Phys.Chem. 87, 717(1983).Google Scholar
12 Alonso, J.A., Gallego, L.J., and Lopez, J.M., Philos.Mag. A58, 79(1988).Google Scholar