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Crystallization of ternary Zr-based glasses—Kinetics and microstructure

Published online by Cambridge University Press:  31 January 2011

G. K. Dey
Affiliation:
Materials Science Division, Bhabha Atomic Research Center, Trombay, Bombay 400 085, India
R. T. Savalia
Affiliation:
Materials Science Division, Bhabha Atomic Research Center, Trombay, Bombay 400 085, India
E. G. Baburaj
Affiliation:
Materials Science Division, Bhabha Atomic Research Center, Trombay, Bombay 400 085, India
S. Banerjee
Affiliation:
Materials Science Division, Bhabha Atomic Research Center, Trombay, Bombay 400 085, India
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The effect of ternary addition on the thermal stability and the sequence and the kinetics of crystallization of metallic glasses Zr76Fe(24−x)Nix (x = 0, 4, 8, 12, 16, 20, 24) have been examined. It has been found that the surface crystallization occurs in the composition range 16 < x < 20, leading to the formation of an ordered Fe-rich (Fe, Ni)3Zr cubic phase, followed by the transformation of the bulk to a mixture of α−Zr and Zr2Ni. Crystallization of alloys containing 12 to 20% Fe occurs at lower temperatures by primary crystallization of Zr3(Fe, Ni), followed by decomposition of the remaining amorphous matrix by eutectic crystallization giving rise to α−Zr + Zr2Ni. At higher temperatures these alloys transform polymorphically to Zr3(Fe, Ni) in which Ni partially substitutes Fe in the Zr3Fe lattice. Copious nucleation of Zr3(Fe, Ni) phase in these alloys, leading to the formation of a nanophase structure, has been observed. This is consistent with the prediction of increasing nucleation rate for Fe-rich compositions. The crystal nucleation and growth kinetics have been examined for primary, eutectic, and polymorphic crystallization processes. The observed nucleation and growth behaviors have been rationalized by considering the role of the quenched in nuclei and the activation energies of nucleation and growth.

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Copyright © Materials Research Society 1998

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References

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