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Structural Relaxation of Open Volume in Hyper-Eutectic Zr-Cu-Al Bulk Amorphous Alloys Measured by Positron Annihilation

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Abstract:

The Zr-Cu-Al bulk amorphous (BA) alloys, which have no long-range ordered structure, possess various properties such as high strength and toughness with compositional dependence. In the present study, in order to estimate the natures of local structure change and relaxation behavior of hyper-eutectic BA alloys during annealing, positron annihilation measurements and density measurement have been performed for hyper-eutectic Zr-Cu-Al BA alloys with annealing. The enthalpy relaxation and structural relaxation was also measured by differential scanning calorimetry (DSC) measurement. These results show that the relaxation process of free volume containing in hyper-eutectic BA alloys is different from that in hypo-eutectic alloys.

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Periodical:

Defect and Diffusion Forum (Volume 373)

Pages:

130-133

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.373.130

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Online since:

March 2017

Authors:

Taishi Ishiyama, Kazukui Kobayashi, Yoshihiko Yokoyama, Toyohiko J. Konno, Akihiro Iwase, Fuminobu Hori*

Keywords:

Bulk Amorphous Alloy, Free Volume, Positron Annihilation, Structural Relaxation

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© 2016 Trans Tech Publications Ltd. All Rights Reserved

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