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Crystallization and Glass Foriation in Electron and Laser Beam Irradiated Cu-Zr Alloys

  • J. S. Huang (a1), E. N. Kaufmann (a1), M. A. Wall (a1) and B. L. Olsen (a1)

Abstract

Four Cu-Zr alloys, Cu56Zr44, Cu50Zr50, Cu47Zr53, and Cu33Zr67, were surface melted with electron and pulsed laser beams to compare their kinetics of nucleation, growth and glass formation. It was observed that the ease of glass formation increased in the order: Cu33Zr67, Cu47Zr53, Cu56Zr44, and Cu50Zr50. The nucleation and regrowth produced different metastable phases. At the equiatomic composition, the preferred phase is a CsCl-type (B2) BCC structure. As the composition deviates from this, the preferred phase is either orthorhombic or tetragonal with a much larger unit cell not previously reported in the literature. The maximum growth velocity of these metastable phases was found to be about 0.025 m/s. The slow kinetics are responsible for the ease of glass formation in these systems.

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References

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1. Huang, J. S. and Kaufmann, E. N., to be published in J. Mater. Res., 1988.
2. Pearson's Handbook of Crystallographic Data for Intermetallic phases (ASM, 1985), Vol.2, p. 20412042.
3. Carvalho, E. M. and Harris, I. R., J. Mater. Sci. 15 (1980) 12241230.
4. Marshall, A. F., Lee, Y. S. and Stevenson, D. A., Acta Metall. 35 (1987) 6168.

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