Oxidation of amorphous alloys

Xu, Zhiqiang; Xu, Yifei; Zhang, An; Wang, Jiangyong; Wang, Zumin

doi:10.1016/j.jmst.2018.02.015

Cited by 34 publications

(11 citation statements)

References 89 publications

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“…The rejection (or the inward migration) of Ni and Cu from Layer I could be associated to the difference in chemical affinity between Ti/Zr and Cu/Ni to O. 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.…”

Section: Amorphous Surface Oxide Layer Formationmentioning

confidence: 78%

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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Section: Amorphous Surface Oxide Layer Formationmentioning

confidence: 78%

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

et al. 2020

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“…2, obvious color change of the samples annealed under different temperatures can be seen with increasing annealing temperatures, even below 380°C. This indicates that the samples annealed below 380°C had experienced oxidation, but the behavior was beyond the resolution of XRD characterizations, probably because only a thin layer of oxide had formed or the oxide was amorphous [10]. However, the change of color implies the variation in optical properties upon oxidation, which may reflect the degree of oxidation.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Due to the high chemical activity of metals, oxide layer can form on the surfaces of BMGs [10,11], which leads to the variation in mechanical, physical, and chemical properties. On one hand, oxidation has to be avoided in many applications to prevent degradation of components [10]. On the other hand, it has been found that the oxide layer can be helpful for enhanced properties, in particular, for the strengthening of micro devices, because it can prevent the micro devices from failure upon friction [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…Typically, thermogravimetric analysis (TGA), X-ray diffraction (XRD), and transmission electron microscopy (TEM) are the most widely used methods to characterize the oxidation of BMGs [10]. However, these methods are either time consuming or incapable to capture the process of early stage oxidation.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Oxidation of a Zr46Cu46Al7Gd1 bulk metallic glass detected via optical characterizations

Xie

Cao

et al. 2020

Sci. China Mater.

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Oxidation of metallic glasses has been shown to be different from crystalline alloys due to the disordered atomic structures and far-from-equilibrium state, and quick characterization is required to reveal their early stage oxidation. In this study, we investigated the oxidation behavior of a Zr 46 Cu 46 Al 7 Gd 1 bulk metallic glass by measuring the changes of optical constants via spectroscopic ellipsometry. Characterizations with X-ray diffraction, scanning electron microscopy, and thermogravimetric analyzer confirmed that the changes of pseudo-optical constants reflected not only the onset temperature at which the alloys underwent obvious oxidation, but also the subtle oxidation which was tedious to characterize. Our study suggests a more efficient and accurate approach to understand the oxidation of metallic glasses with temperature, time and compositions.

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Mechanical Properties of an Ultrahard In Situ Amorphous Steel Matrix Composite

Yazdani,

Dewitt,

Huang

et al. 2024

Adv Eng Mater

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We report compression tests on micro‐pillars manufactured from bulk specimens of partially devitrified SAM2×5 (Fe49.7Cr17.7Mn1.9Mo7.4W1.6B15.2C3.8Si2.4). Yield strength values of ∽6 GPa were obtained. Such a high strength can be attributed to the higher glass transition temperature (883 K) of this material, which impedes the multiplication of shear bands under loading, and to the presence of hard crystalline domains that result from devitrification of the amorphous powders during powder consolidation. The Vickers hardness of the specimens was found to be strongly correlated to the processing temperature and, hence to the volume of crystalline phases present in the specimens. As the processing temperature is increased, there is a reduction in free volume from the structural relaxation process in the amorphous alloy, leading to the eventual nucleation of crystalline phases of BCC Fe, Cr2B, Cr21.30Fe1.7C6, or Fe23B2C4, during the densification process. These results shed light on the relationship between nanocrystalline domains and the mechanical behavior of Fe‐based amorphous/crystalline composites.This article is protected by copyright. All rights reserved.

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Oxidation of amorphous alloys

Cited by 34 publications

References 89 publications

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

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

Oxidation of a Zr46Cu46Al7Gd1 bulk metallic glass detected via optical characterizations

Mechanical Properties of an Ultrahard In Situ Amorphous Steel Matrix Composite

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