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A method for characterizing the ordering process of metallic glasses using exafs

A metallic glass and characterization technology, which is applied in the preparation of test samples, material analysis and sampling using wave/particle radiation, etc., can solve the problems of inability to analyze microscopic mechanisms and atomic migration and diffusion laws

Active Publication Date: 2022-03-04
SHANDONG JIANZHU UNIV
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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to change the traditional method of analyzing the kinetic characteristics of the metallic glass ordering process through thermal performance testing, and solve the problem that the traditional thermal analysis method cannot analyze the microscopic mechanism and the law of atomic migration and diffusion in the ordering process , through the combination of absorption spectrum analysis technology and numerical simulation, the atomic migration and diffusion process, the formation and growth mechanism of crystal nuclei, and the kinetic characteristics of ordering during the ordering process of metallic glasses are obtained, so as to characterize the properties of metallic glass alloys ordering process

Method used

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  • A method for characterizing the ordering process of metallic glasses using exafs
  • A method for characterizing the ordering process of metallic glasses using exafs
  • A method for characterizing the ordering process of metallic glasses using exafs

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Embodiment

[0028] The test adopts the atomic percentage as Zr 48 Cu 36 Al 8 Ag 8 metallic glass.

[0029] a. Select the nominal composition as Zr 48 Cu 36 Al 8 Ag 8 (at.%) metallic glass as the object, obtained 5×400mm thin strip metallic glass through vacuum arc melting (repeated smelting 5 times) and vacuum belt throwing, and cut and thinned it into a thin sheet alloy sample of 3mm×3μm;

[0030] b. Place the sample in the EXAFS (wavelength 0.01nm) absorption spectrum optical path for ex-situ isothermal ordering treatment, the treatment temperature is 470°C, and the radiation data collection frequency is 6min, and the EXAFS absorption line I of the alloy is obtained M (2θ), see appendix figure 1 ;

[0031] c. Correct and convert the obtained absorption spectrum data to obtain the alloy interference function I(Q) of the alloy, and perform Fourier transformation to obtain the reduced radial distribution function G(r) and radial distribution function RDF(r), etc.; Calculate the n...

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Abstract

A method for characterizing the ordering process of metallic glasses by using EXAFS, comprising: measurement of EXAFS absorption spectrum of ordered metallic glasses; calculation of atomic structure distribution; data dynamic fitting; analysis of ordering dynamics characteristics. This method can accurately and reliably measure and analyze the kinetic characteristics of the ordering process, so as to guide the production and preparation process of nanocrystalline materials and achieve the purpose of practical industrialization.

Description

technical field [0001] The invention belongs to the technical field of nanocrystal preparation and the technical field of metallic glass ribbon research, and relates to a technical method for characterizing the ordering characteristics of metallic glass, in particular to a method for characterizing the ordering process of metallic glass by using EXAFS. Background technique [0002] Compared with crystalline materials, metallic glass thin ribbons have a long-range disordered and short-range ordered structure, and have a unique series of excellent mechanical, physical and chemical properties, such as high strength, high hardness, great elastic limit at room temperature and Good formability in viscous state, etc., has broad application prospects in military, medical equipment, sports equipment and other fields. Nano-ordering of metallic glasses is a promising process to obtain nanocrystalline structured materials, which largely expands the application potential and scope of met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/085G01N1/28G01N1/44
CPCG01N23/085G01N1/286G01N1/44G01N2001/2873
Inventor 徐勇徐丽丽杨凌飞张东明谷子丰陈可欣武律久杜雨嫣石磊
Owner SHANDONG JIANZHU UNIV
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