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Thermal Properties of Cu-Hf-Ti Metallic Glass Compositions

Published online by Cambridge University Press:  05 March 2013

I. A. Figueroa
I. A. Figueroa*
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Cd. Universitaria, Del. Coyoacán, México D.F. C. P. 04510, México.
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Abstract

The glass transition temperature T g , crystallization temperature T x , solidus temperature T m , and liquidus temperature T l , of a number of ternary Cu-Hf-Ti glassy alloys in the composition range of 51< Cu <67, 5 < Hf < 40 and 5 < Ti <40 (at.%) are reported and discussed. It is found that increasing the Ti:Hf ratio results in a rapid decreasing of T g and T x . This behavior is related to the fact that the melting point and cohesive energy for Ti are substantially lower than for Hf. The solidus temperature T m , remains relatively constant on a wide range of compositions. The liquidus temperatures data suggest a ternary eutectic within the compositional field encompassed by the Cu55Hf20Ti25, Cu59Hf21Ti20, Cu60Hf20Ti20 and Cu55Hf21Ti24 alloys, with a liquidus temperature, T l , of ∼1170 K; this is supported by the DTA traces, which show a single melting peak. Based on the DTA analysis, the experimentally calculated liquidus projection for the ternary Cu-Hf-Ti alloy system is also reported.

Keywords

phase transformationstregthmetal

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MRS Online Proceedings Library (OPL) , Volume 1485: Symposium 7D – Advanced Structural Materials—2012 , 2012 , pp. 155 - 160
Copyright
Copyright © Materials Research Society 2013 

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References

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