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Surface Energy Driven Crystallization of Amorphous Ni69Cr14P17 Alloy

Published online by Cambridge University Press:  21 February 2011

G. Schumacher ,
N. Wanderka  and
R. P. Wahi
G. Schumacher
Affiliation:
Argonne National Laboratory, Materials Science Division, 9700 South Cass Avenue, Argonne, IL 60439
N. Wanderka
Affiliation:
Hahn-Meitner-Institut Berlin, Glienicker Strasse 100, D-14109 Berlin, Germany
R. P. Wahi
Affiliation:
Argonne National Laboratory, Materials Science Division, 9700 South Cass Avenue, Argonne, IL 60439
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Abstract

Amorphous Ni69Cr14P17 specimens thinned for transmission electron microscopy have been studied in situ during thermal treatment. In the thinnest regions of the specimens (thickness d < 50 nm), a metastable hexagonal (Ni,Cr)3P phase nucleates at the perforation edge with the c-axis perpendicular to the specimen surface. The crystal width of this phase grows linearly with time. Above 530°C the hexagonal phase transforms into a stable b.c.t. (Ni,Cr)3P phase. It is concluded that the surface and grain boundary energies dominate nucleation and growth.

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References

REFERENCES

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