Titanium-based bulk amorphous matrix composite and method of fabricating thereof

Abstract

A Ti-based bulk amorphous matrix composite including a composition represented by Formula 1, in at %:TiaZrbBecCudNieMfIg  Formula 1where M is at least one of Nb and Ta, I is an impurity, and a, b, c, d, e, and f vary within the ranges 38≦a≦50, 11≦b≦18, 12≦c≦20, 6≦d≦10, 6≦e≦9, 1≦f≦20 and 0.01≦g≦0.5, with a+b+c+d+e+f+g=100.

Description

[0001]This application claims priority to and the benefit of Korean Patent Application No. 10-2012-0065705, filed on Jun. 19, 2012, and all the benefits accruing therefrom under 35 U.S.C. §119, the content of which in its entirety is herein incorporated by reference.BACKGROUND OF THE INVENTION[0002](a) Field of the Invention[0003]A titanium-based bulk amorphous matrix composite and method of fabricating thereof are provided.[0004](b) Description of the Related Art[0005]Concerns about the reduction of natural resources and global warming have encouraged the development of alternative energies. Among possible candidate sustainable and clean energies, hydrogen-related energy such as fuel cell is expected to grow rapidly in the coming years owing to abundance of hydrogen. Before being used as fuel, hydrogen should be extracted from other gasses or compounds. Although several techniques may be applied for this purpose such as chemical or electrolytic methods, the permeation through a sol...

AI Technical Summary

Benefits of technology

The patent describes a new material that can be used for separating and purifying hydrogen gas. The material has high hydrogen permeability, mechanical strength, and resistance to corrosion. It is made up of a matrix with a bcc phase rich in elements like nitrogen and tantalum, which provides higher hydrogen permeability than currently available materials. The material also has good strength and flexibility at room temperature. Additionally, the material has excellent resistance to corrosion when exposed to high concentrations of sulfuric acid at room temperature. Overall, this material has unique properties that make it a potential candidate for use in hydrogen separation and purification processes.

Problems solved by technology

However, the scarcity and price of Pd element is encouraging the development of alternative alloys for the commercialization of H2 separation membranes.

Despite the remarkable combination of physical, chemical and mechanical properties achieved by these various alloy systems, the range of applications of metallic glasses have not been extended for several reasons.

Firstly, the metallic glasses suffer from the lack of reliability and reproducibility of the properties because alloys developed till now are sensitive to impurities, particularly oxygen, which generally led to severe embrittlement.

Secondly, these alloys as for oxide glasses are intrinsically brittle, i.e., they may not be deformed plastically at ambient temperature under tensile mode.

The mechanism of plastic deformation in metallic glasses is thus fundamentally different from that in crystalline solids because of the lack of long-range order in the atomic structure of these materials.

Under tensile mode, the shear bands do not extend but remain localized and unstable.

The inconceivably large value of plastic strain in a thin region induced the cumulation of point defects leading to formation of cracks and thus leading to a brittle fracture.

The ex-situ approach enables tensile ductility however at the expense of the strength and makes the preparation of the composites more complicated.

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