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Metals 2017, 7(4), 148; doi:10.3390/met7040148

Formation and Corrosion Behavior of Mechanically-Alloyed Cu–Zr–Ti Bulk Metallic Glasses

1
Institute of Materials Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan
2
Department of Materials Engineering, Tatung University, 40 Chungshan N. Road, 3rd Sec., Taipei 10452, Taiwan
*
Author to whom correspondence should be addressed.
Received: 31 August 2016 / Revised: 8 April 2017 / Accepted: 18 April 2017 / Published: 20 April 2017
(This article belongs to the Special Issue Mechanical Alloying)
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Abstract

Cu60Zr30Ti10 metallic glass powder was prepared by mechanically alloying a mixture of pure Cu, Zr, and Ti powders after 5 h of milling. Cu60Zr30Ti10 bulk metallic glass (BMG) was synthesized by vacuum hot pressing the as-milled Cu60Zr30Ti10 metallic glass powder at 746 K in the pressure range of 0.72–1.20 GPa, and the structure was analyzed through X-ray diffraction and transmission electron microscopy. The pressure could enhance the thermal stability, and prolong the existence, of the amorphous phase inside the Cu60Zr30Ti10 powder. Furthermore, the corrosion behavior of the Cu-based BMG in four corrosive media was studied using a potentiodynamic method. The Cu60Zr30Ti10 BMG exhibited a low corrosion rate and current density in 1 N solutions of H2SO4, NaOH, and HNO3. X-ray photoelectron spectroscopy results revealed that the formation of Zr- and Ti-rich passive oxide layers provides a high corrosion resistance against 1 N H2SO4 and HNO3 solutions, and the breakdown of the protective film by Cl attack was responsible for pitting corrosion in a 3 wt % NaCl solution. The formation of oxide films and the nucleation and growth of pitting were analyzed through microstructural investigations. View Full-Text
Keywords: mechanical alloying; bulk metallic glass; corrosion; supercooled liquid region; vacuum hot pressing mechanical alloying; bulk metallic glass; corrosion; supercooled liquid region; vacuum hot pressing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lee, P.-Y.; Cheng, Y.-M.; Chen, J.-Y.; Hu, C.-J. Formation and Corrosion Behavior of Mechanically-Alloyed Cu–Zr–Ti Bulk Metallic Glasses. Metals 2017, 7, 148.

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