NDLI: Oxidation feature and diffusion mechanism of Zr-based metallic glasses near the glass transition point

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Oxidation feature and diffusion mechanism of Zr-based metallic glasses near the glass transition point

Content Provider	Scilit
Author	Hu, Zheng Lei, Xianqi Wang, Yang Zhang, Kun
Copyright Year	2018
Description	Journal: Materials Research Express The oxidation behaviors of as-cast, pre-deformed, and crystallized Zr47.9Ti0.3Ni3.1Cu39.3Al9.4 metallic glasses (MGs) were studied near the glass transition point. The oxidation kinetics of the crystallized MGs followed a parabolic-rate law, and the as-cast and pre-deformed MGs exerted a typical two-stage behavior above the glass transition temperature (Tg). Most interesting, pre-deformed treatment can significantly improve the oxidation rate of MGs, as the initial oxidation appeared earlier than for the as-cast MGs, and was accompanied by much thicker oxide scale. The EDS and XPS results showed that the metal Al acted as the preferred scavenger that absorbed intrinsic oxygen in the near-surface region of as-cast MGs. However, a homogeneous mixed layer without Al was observed in the pre-deformed MGs. We speculated the accelerated diffusion of other elements in the MGs was due to the local increase in the free volume and significant shear-induced dilation of the local structure. The results from this study demonstrate that MGs exhibit controllable atomic diffusion during the oxidation process, which can facilitate use in super-cooled liquid region applications.
Related Links	http://iopscience.iop.org/article/10.1088/2053-1591/aab309/pdf
ISSN	20531591
e-ISSN	20531591
DOI	10.1088/2053-1591/aab309
Journal	Materials Research Express
Issue Number	3
Volume Number	5
Language	English
Publisher	IOP Publishing
Publisher Date	2018-03-01
Access Restriction	Open
Subject Keyword	Journal: Materials Research Express Metallurgy and Metallurgical Engineering
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Metals and Alloys Biomaterials Electronic, Optical and Magnetic Materials Polymers and Plastics

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