Superplastic Deformation Behavior of Zr41.25Ti13.75Ni10Cu12.5Be22.5 Bulk Metallic Glass in Supercooled Liquid Region
Shen, Jun, Wang, G., Sun, J.F. , Stachurski, Zbigniew H., Yan, Cheng, Ye, Lin , & Zhou, B.D. (2005) Superplastic Deformation Behavior of Zr41.25Ti13.75Ni10Cu12.5Be22.5 Bulk Metallic Glass in Supercooled Liquid Region. Intermetallics, 13(1), pp. 79-85.
This paper presents the tensile deformation behavior of Zr41.25Ti13.75Ni10Cu12.5Be22.5 (at%) bulk metallic glass in the supercooled liquid region. Isothermal tensile tests were carried out at four characteristic temperatures of 616, 636, 656 and 676 K which are in the range from glass transition temperature (w616 K) to onset crystallization temperature (w690 K). The results show that the superplastic flow behaviors of the material (flow stress and elongation to fracture) vary, depending strongly on the test temperatures and initial strain-rates. At a given temperature, the elongation first increases and then decreases with the initial strain-rate increasing, and the maximum elongation was found to be as high as 1625% at the temperature of 656 K with the strain-rate of 7.6!10K3 sK1. DSC analysis shows the crystallized volume fraction in the deformed section is always higher than that of the undeformed section in the specimens. The maximum elongation always corresponds to the maximum crystallized volume fraction. Nanocrystals homogeneously embedded in the amorphous matrix of the deformed specimens were observed by transmission electron microscope. It is conjectured that the nanocrystallization was induced by the flow stress and environmental temperature.
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|Item Type:||Journal Article|
|Keywords:||Glasses, metallic, Superplastic behaviour, Microstructure, Calorimetry, Electron microscopy, transmission|
|Subjects:||Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200)|
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > RESOURCES ENGINEERING AND EXTRACTIVE METALLURGY (091400)
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering|
|Copyright Owner:||Copyright 2005 Elsevier|
|Copyright Statement:||Reproduced in accordance with the copyright policy of the publisher.|
|Deposited On:||19 Apr 2007|
|Last Modified:||29 Feb 2012 23:22|
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