On the competition between synchronous oxidation and preferential oxidation in Cu-Zr-Al metallic glasses

Xu, Yifei; Jeurgens, Lars P. H.; Hong, Byungyou; Lin, Luchan; Zhu, Shengli; Huang, Yuan; Liu, Yongchang; Qiao, J.W.; Wang, Zumin

doi:10.1016/j.corsci.2020.108996

Cited by 15 publications

(4 citation statements)

References 61 publications

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“…[22]. As was demonstrated, chemical interaction of Cu with Al in a Cu-rich Cu-Zr-Al BMG induces preferential oxidation of Zr over Al, coupled with a strong Cu enrichment adjacent to the oxide growth front which leads to a reduced GFA [23]. It was found that the thermal stability decreases when Ti is alloyed to the Cu-Zr binary system [24], while a slight composition adjustment can make a considerable contribution to higher GFA and thermal stability [25].…”

Section: Introductionmentioning

confidence: 83%

Comprehensive thermal analysis of a high stability Cu–Zr–Al bulk metallic glass subjected to high-pressure torsion

Révész

Arjmandabasi

Schafler

et al. 2023

J Therm Anal Calorim

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Bulk metallic glass of Cu38Zr54Al8 nominal composition was synthesized by copper mold casting into 6 mm diameter rods. Disks of the as-cast glass were subjected to severe plastic deformation by high-pressure torsion for different number of revolutions. The microstructure and the thermal behavior of the as-cast, isothermally annealed and deformed glass have been investigated by X-ray diffraction and differential scanning calorimetry, respectively. Continuous heating experiments revealed a two-stage devitrification event with excellent glass forming parameters, such as glass transition (Tg = 671 K), supercooled liquid region (∆Tx = 80 K), reduced glass transition (Tr = 0.57) and gamma parameter (γ = 0.41). Power law crystal growth during diffusion-controlled homogeneous nucleation was observed for isothermal annealings. Glassy state was preserved almost in the entire sample volume of the as-cast alloy during the high-pressure torsion process, corresponding to the extreme stability of the Cu38Zr54Al8 alloy against deformation-induced devitrification. This is in accordance with the transition of the reversible specific heat from the glassy to supercooled liquid state measured by modulated calorimetry. It was also concluded that glassy structure is more ordered in the severely deformed state.

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Section: Introductionmentioning

confidence: 83%

Comprehensive thermal analysis of a high stability Cu–Zr–Al bulk metallic glass subjected to high-pressure torsion

Révész

Arjmandabasi

Schafler

et al. 2023

J Therm Anal Calorim

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“…For the alloys with dominant Cu content, the Cu atoms with a smaller atomic radius that diffused faster to the surface and reacted with oxygen gradually formed an amorphous Cu 2 O layer on top of the oxide film, with an amorphous ZrO 2 oxide layer below. The researchers further studied the oxidation mechanism of Cu x (Zr 0.67 Al 0.33 ) 100-x (25≤x ≤ 50) amorphous alloys at high temperatures 126 . Native surface oxides on Cu 47 Zr 45 Al 8 metallic glassy formed under ambient conditions, which were observed by aberration-corrected STEM 127 , and consisted of dominant Al 2 O 3 and ZrO 2 amorphous oxides with homogenously embedded crystalline Cu 2 O nanoparticles that formed at the metallic glass/ oxide interface and were attributed to the much lower formation Gibbs free energies of Cu 2 O (-110 kJ mol -1 ) than that of ZrO 2 (-990 kJ mol -1 ) and Al 2 O 3 (-1580 kJ mol -1 ).…”

Section: Native Oxidementioning

confidence: 99%

Recent research progress on the passivation and selective oxidation for the 3d-transition-metal and refractory multi-principal element alloys

Wang,

Yan,

et al. 2023

npj Mater Degrad

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The wide range of alloy composition controllability for multi-principal element alloys (MPEAs) may provide a great opportunity for discovering special forms of surface oxides to improve the corrosion and oxidation resistance in extreme environments. Changing the type and content of promoting passivation elements would not only change the microstructure of the alloy but also significantly affect the composition and structure of the surface passive film, resulting in a strong impact on the corrosion and oxidation resistance of the alloy. This article reviews recent research on the effects of alloying elements on the passivation properties, the contribution of each alloying element, and the synergistic effect between the elements on the passivation mechanisms and electrochemical dissolution characteristics of surface passive films that form on some MPEAs. In addition, the composition and structural characteristics of surface oxides relevant to the selective oxidation of elements are elaborated upon. Finally, several open questions and recommendations for research directions regarding the passivation and selective oxidation of MPEAs were provided to guide future exploration.

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“…Therefore, it is necessary to investigate the influences of the spray temperatures, especially near the amorphous alloy's glass transition temperature (T g ), on the microstructure and performance of HVAF sprayed amorphous coatings. Compared with Fe-based and Cu-based amorphous alloys, Cu-Zr-Al-based alloys with the high glass-forming ability (GFA) [32][33][34] have been widely studied, showing great potential to be used in various applications. For example, Cu-Zr-Al-Ag alloy systems that exhibit good antibacterial properties are of great interest in biomedical applications, taking advantage of Cu and Ag elements that are well-known antibacterials [8,12,35].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Wear Properties of HVAF Sprayed Cu-Zr-Al-Ag-Co Amorphous Coatings at Different Spray Temperatures

et al. 2022

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Wear-resistant Cu-Zr-Al-Ag-Co amorphous coatings were fabricated by high-velocity air-fuel spray technology using (Cu43Zr47Al7Ag3)99.5Co0.5 powder at different temperatures (i.e., 645, 725, and 805 K). The feedstock powders (98.6 wt.% amorphous phase) were produced by a gas atomization method. Thermal properties and microstructure of the powders and the coatings were comparably investigated by differential scanning calorimeter, scanning electron microscope, and transmission electron microscopy techniques. Wear properties were studied by a dry sliding wear tester under the linear reciprocating sliding in a ball-on-plate mode using a GCr15 ball as the counterpart at room temperature in air. A large fraction of amorphous phase (~67.5 wt.%) and crystalline phases (ZrO2, Al2.5Cu0.5Zr, and AlZr3) are found in the coating fabricated at a temperature (725 K) between the glass transition temperature (Tg) and the onset crystallization temperature (Tx). In addition, the coating also exhibits the highest Vickers hardness (554 HV0.1), bonding strength (59.3 MPa), a relatively low porosity (1.65%), and superior wear resistance. The wear mechanism of the coating is primarily abrasive wear and slight adhesive wear.

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On the competition between synchronous oxidation and preferential oxidation in Cu-Zr-Al metallic glasses

Cited by 15 publications

References 61 publications

Comprehensive thermal analysis of a high stability Cu–Zr–Al bulk metallic glass subjected to high-pressure torsion

Comprehensive thermal analysis of a high stability Cu–Zr–Al bulk metallic glass subjected to high-pressure torsion

Recent research progress on the passivation and selective oxidation for the 3d-transition-metal and refractory multi-principal element alloys

Microstructure and Wear Properties of HVAF Sprayed Cu-Zr-Al-Ag-Co Amorphous Coatings at Different Spray Temperatures

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