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.
Highlights
New metallic glass alloys with a wide supercooled liquid region exceeding 30 K have been prepared in numerous Cu-based alloy systems, such as Cu–Ti–Zr, Cu–Hf–Ti, Cu–Zr–Hf–Ti, Cu–Zr–Ti–Y, Cu–Ti–Zr–Ni–Si, and Cu–Ti–Zr–Ni–Sn systems [1,2,3]
Cu-based bulk metallic glasses (BMGs) with diameters ranging from 2 mm to 6 mm have been produced using conventional casting techniques at a low cooling rate [2]
These new alloys are expected to increase the number of application fields of BMGs because of their unique properties, such as high tensile strength, large elastic limits (~2%), and high resistance to corrosion and wear
Summary
New metallic glass alloys with a wide supercooled liquid region exceeding 30 K have been prepared in numerous Cu-based alloy systems, such as Cu–Ti–Zr, Cu–Hf–Ti, Cu–Zr–Hf–Ti, Cu–Zr–Ti–Y, Cu–Ti–Zr–Ni–Si, and Cu–Ti–Zr–Ni–Sn systems [1,2,3]. Cu-based bulk metallic glasses (BMGs) with diameters ranging from 2 mm to 6 mm have been produced using conventional casting techniques at a low cooling rate [2] These new alloys are expected to increase the number of application fields of BMGs because of their unique properties, such as high tensile strength, large elastic limits (~2%), and high resistance to corrosion and wear. A large supercooled liquid region is known to be essential for the formation of BMGs through rapid solidification; this restricts BMG formation to near-eutectic compositions, where supercooling can be achieved without the nucleation of crystalline phases In this regard, an alternative method to prepare metallic glasses is mechanical alloying (MA) [16]. The corrosion behavior of the Cu60 Zr30 Ti10 BMG in four corrosive media (1 N H2 SO4 , HNO3 , and NaOH and 3 wt % NaCl) was studied using a potentiodynamic method
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