Bulk metallic glassy surface native oxide: Its atomic structure, growth rate and electrical properties

Louzguine-Luzgin, Dmitri V.; Chen, C.L.; Lin, Liyang; Wang, Z.C.; Ketov, S.V.; Miyama, Masamichi J.; Trifonov, A. S.; Лубенченко, А. В.; Ikuhara, Yuichi

doi:10.1016/j.actamat.2015.06.039

Cited by 44 publications

(18 citation statements)

References 62 publications

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“…Correspondingly, [22] is comparable to the one of the metallic glass investigated in this work and we expectedly find our results in good agreement with the results by Louzguine-Luzgin et al Figure 1 shows high-resolution TEM images on the cross section of a sample oxidized for 90 min. Both high resolution TEM images show that the structure of the underlying metallic alloy was amorphous after the oxidation treatment.…”

Section: Samples Characterizationsupporting

confidence: 81%

Importance of surface oxide for the tribology of a Zr-based metallic glass

et al. 2017

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Thermally grown surface oxide layers dominate the single-asperity tribological behavior of a Zr 60 Cu 30 Al 10 glass. Increase in oxidation time leads to an increased contribution of shearing and a corresponding decreased contribution of ploughing to friction. This change in the dominating friction and wear mechanism results in an overall minor decrease of the friction coefficient of oxidized surfaces compared to the metallic glass sample with native surface oxide. Our results demonstrate the importance of creating a stable oxide layer for practical applications of metallic glasses in micro-devices involving sliding contact.

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Section: Samples Characterizationsupporting

confidence: 81%

Importance of surface oxide for the tribology of a Zr-based metallic glass

et al. 2017

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“…As also summarised by Xu et al [32] after reviewing the oxidation behaviours of a number of amorphous alloys, an enrichment of "inert" elements (regarding to their relatively low chemical affinity to O) is often found in the interfacial area below the surface oxide, while the "active" components (regarding to their relatively high chemical affinity to O) are oxidised at the topmost surface. Segregation of Cu near the interface between the surface oxide layer and the substrate was also reported by Louzguine-Luzgin et al [33] in the native surface oxide formed in ambient conditions on Cu-Zr-Al BMG. This is also supported by the observation made by the authors of this study that Ni was pushed inward during thermal oxidation based CCT of a NiTi-shaped memory alloy [34].…”

Section: Amorphous Surface Oxide Layer Formationsupporting

confidence: 76%

“…Amorphous oxygen-enriched surface layers were also reported on other Zr-based metallic glasses (e.g., on Al-Zr [35][36][37] and Cu 45 Zr 45 Al 8 Be 2 [38]) after oxidation. Crystalline Al 2 O 3 and CuO were reported to co-exist with the amorphous ZrO 2 formed in native oxide in [33]. However, no such crystalline phases were identified under TEM within Layer I in this study, which is attributable to the differences in alloy composition and oxidation temperature employed in this study.…”

Section: Amorphous Surface Oxide Layer Formationcontrasting

confidence: 54%

Improving the Tribological Properties and Biocompatibility of Zr-Based Bulk Metallic Glass for Potential Biomedical Applications

et al. 2020

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Zr-based bulk metallic glasses (Zr-BMGs) are potentially the next generation of metallic biomaterials for orthopaedic fixation devices and joint implants owing to their attractive bulk material properties. However, their poor tribological properties and long-term biocompatibility present major concerns for orthopaedic applications. To this end, a novel surface modification technology, based on ceramic conversion treatment (CCT) in an oxidising medium between the glass transition temperature and the crystallisation temperature, has been developed to convert the surface of commercially available Zr44Ti11Cu10Ni11Be25 (Vitreloy 1b) BMG into ceramic layers. The engineered surfaces were fully characterised by in-situ X-ray diffraction, glow-discharge optical emission spectroscopy, scanning electron microscopy, transmission electron microscopy, and scanning transmission electron microscopy. The mechanical, chemical, and tribological properties were evaluated respectively by nano-indentation, electrochemical corrosion testing, tribological testing and the potential biocompatibility assessed by a cell proliferation assay. The results have demonstrated that after CCT at 350 °C for 40 h and at 380 °C for 4.5 h the original surfaces were converted into to a uniform 35–55-nm-thick oxide layer (with significantly reduced Ni and Cu concentration) followed by a 200–400-nm-thick oxygen-diffusion hardened case. The surface nano hardness was increased from 7.75 ± 0.36 to 18.32 ± 0.21 GPa, the coefficient of friction reduced from 0.5–0.6 to 0.1–0.2 and the wear resistance improved by more than 60 times. After 24 h of contact, SAOS-2 human osteoblast-like cells had increased surface coverage from 18% for the untreated surface to 46% and 54% for the 350 °C/40 h and 380 °C/4.5 h treated surfaces, respectively. The significantly improved tribological properties and biocompatibility have shown the potential of the ceramic conversion treated Zr-BMG for orthopaedic applications.

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“…Here, we should also take into consideration the fact that the AFM tip probed the surface of the metallic glasses under ambient conditions, and there was always a layer of native oxides on top of the glass surface 31 . The thickness of the native oxide layer of the selected glasses is on the order of 1 nm, and the layer has an amorphous structure 32 .…”

Section: Resultsmentioning

confidence: 99%

On cryothermal cycling as a method for inducing structural changes in metallic glasses

et al. 2018

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The influence of cryothermal treatment on the mechanical properties of metallic glasses with different compositions was investigated in the present work. It was found that cryothermal cycling can induce rejuvenation as well as relaxation of the metallic glasses. The local apparent Young's modulus and its spatial distribution width on the surface of the metallic glass increase after cryothermal cycling, while in the bulk the effect depends on the glass composition. It appeared that this increase is temporary and disappears after a period of room temperature aging. This effect is connected with a large distribution of relaxation times in the metallic glasses due to their heterogeneous structure and the formation of complex native oxides on the outer surfaces of the glasses. Our findings reveal that a cryothermal cycling treatment can improve or degrade the plasticity of a metallic glass, and the atomic bond structure appears to be very important for the outcome of the treatment.

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Bulk metallic glassy surface native oxide: Its atomic structure, growth rate and electrical properties

Cited by 44 publications

References 62 publications

Importance of surface oxide for the tribology of a Zr-based metallic glass

Importance of surface oxide for the tribology of a Zr-based metallic glass

Improving the Tribological Properties and Biocompatibility of Zr-Based Bulk Metallic Glass for Potential Biomedical Applications

On cryothermal cycling as a method for inducing structural changes in metallic glasses

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