Effect of the degree of crystallinity on the electrochemical behavior of Mg65Cu25Y10 and Mg70Zn25Ca5 bulk metallic glasses

Zhou, X., Ralston, K.D., Laws, K.J., Cao, J.D., Gupta, R.K., Ferry, M. and Birbilis, N. 2013, Effect of the degree of crystallinity on the electrochemical behavior of Mg65Cu25Y10 and Mg70Zn25Ca5 bulk metallic glasses, Corrosion, vol. 69, no. 8, pp. 781-792.

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Title Effect of the degree of crystallinity on the electrochemical behavior of Mg65Cu25Y10 and Mg70Zn25Ca5 bulk metallic glasses
Author(s) Zhou, X.
Ralston, K.D.
Laws, K.J.
Cao, J.D.
Gupta, R.K.
Ferry, M.
Birbilis, N.
Journal name Corrosion
Volume number 69
Issue number 8
Start page 781
End page 792
Total pages 12
Publisher NACE International
Place of publication Houston, Tex.
Publication date 2013
ISSN 0010-9312
1938-159X
Keyword(s) bulk metallic glass
corrosion
crystallinity
devitrification
magnesium
Summary The effect of varying the percent crystallinity on the electrochemical behavior of Mg65Cu25Y10 and Mg70Zn25Ca5 bulk metallic glasses was studied. The alloys were heat-treated to achieve desired microstructures ranging from fully amorphous to fully crystalline, providing a systematic basis for subsequent testing. Potentiodynamic experiments in 0.01 M sodium chloride (NaCl) were used, whereby both the amorphous and partially crystallized samples were observed to have more noble corrosion potentials and lower anodic kinetics. However, this was accompanied by more rapid cathodic kinetics relative to their fully crystalline counterparts, meaning that corrosion rates were not significantly lower in the amorphous state. To describe the electrochemical response as a function of the degree of crystallinity, differential scanning calorimetry (DSC), scanning electron microscopy, x-ray diffraction (XRD), and electrical conductivity measurements were undertaken, where it was found that crystallinity alone is not necessarily the controlling factor and microchemistry that evolves upon devitrification, plays a key role in the electrochemical response of these materials.
Language eng
Field of Research 091207 Metals and Alloy Materials
091299 Materials Engineering not elsewhere classified
100708 Nanomaterials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30054735

Document type: Journal Article
Collection: Institute for Frontier Materials
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