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Crystallization study of the Ta55–Ir45 amorphous alloy

Published online by Cambridge University Press:  29 June 2016

R. J. Wallace ,
E. N. Kaufmann  and
W. L. Bell
R. J. Wallace
Affiliation:
University of California, Lawrence Livermore National Laboratory, Livermore, California 94550
E. N. Kaufmann
Affiliation:
University of California, Lawrence Livermore National Laboratory, Livermore, California 94550
W. L. Bell
Affiliation:
University of California, Lawrence Livermore National Laboratory, Livermore, California 94550
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Abstract

The crystallization behavior of an arc-melted, splat-quenched amorphous Ta55–Ir45 alloy was investigated by differential thermal analysis (DTA) and transmission electron microscopy (TEM). The DTA experiments showed that the glass transition temperature (Tg) for this material was 485 °C and that the crystallization temperature (Tx) closely followed at 495 °C. This Tx is much lower than has been previously reported. In-situ TEM annealing experiments, in addition to confirming Tx, illustrated that crystallization proceeds as a two-step process. A fcc phase is the first to crystallize at 500 °C followed by the equilibrium phases, α and σ, and/or the bcc Ta phase near 600°–650 °C. Microhardness measurements were made as part of an initial mechanical properties investigation. Inconsistencies with the work of previous investigators of this system are discussed.

Type
Articles
Information
Journal of Materials Research , Volume 1 , Issue 6 , December 1986 , pp. 758 - 764
Copyright
Copyright © Materials Research Society 1986

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