Neutron diffraction characterization method for crystallization kinetic characteristics of bulk amorphous alloy

A technology of dynamic characteristics and amorphous alloys, which is applied in the use of wave/particle radiation for material analysis, scientific instruments, measuring devices, etc., can solve problems such as the inability to analyze microscopic crystallization mechanisms and atomic migration and diffusion laws

Active Publication Date: 2020-02-14
SHANDONG JIANZHU UNIV
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to change the traditional method of analyzing the crystallization kinetics of bulk amorphous alloys through thermal performance testing, and solve the problem that the traditional thermal analysis method cannot analyze the microscopic crystallization mechanism and atomic migration and diffusion laws in the crystallization process. The problem is to obtain the atomic migration and diffusion process, the formation and growth mechanism of crystal nuclei, and the crystallization kinetics characteristics during the nanocrystallization process of bulk amorphous alloys by using the method of diffraction analysis technology and numerical simulation, so as to characterize the bulk amorphous alloys. Nanocrystallization process of crystal alloy

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  • Neutron diffraction characterization method for crystallization kinetic characteristics of bulk amorphous alloy
  • Neutron diffraction characterization method for crystallization kinetic characteristics of bulk amorphous alloy
  • Neutron diffraction characterization method for crystallization kinetic characteristics of bulk amorphous alloy

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Embodiment

[0026] The test adopts the atomic percentage as Zr 48 Cu 36 Al 8 be 7 bulk amorphous alloys.

[0027]a. Select the nominal composition as Zr 48 Cu 36 Al 8 be 7 (at.%) bulk amorphous alloy as the object, obtained Φ5×100mm bulk amorphous alloy through vacuum arc melting (repeated smelting 5 times) and copper mold suction casting, and cut into Φ5×5mm alloy samples;

[0028] b. Place the sample in the neutron diffraction (wavelength 0.01nm) diffraction optical path for ex-situ isothermal crystallization treatment, the treatment temperature is 486°C, and the radiation data collection frequency is 3min;

[0029] c. For the obtained diffraction data (see attached figure 1 , the figure is an example of in-situ neutron diffraction data with heat treatment time of 3min (a) and 54min (b) respectively) for correction and conversion to obtain the interference function I(Q) of the alloy (partial data), see attached figure 2 , the data points in the figure come from the experimenta...

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Abstract

The invention relates to a neutron diffraction characterization method for the crystallization kinetic characteristics of bulk amorphous alloy. Fourier transform and structural function derivation arecarried out on diffraction data to obtain distribution data of atoms in nanocrystals under different time conditions; and segmented fitting is carried out by using a specific JMA equation and crystallization kinetic analysis is carried out based on the segmented fitting. According to the invention, the dynamic characteristics of nanocrystalline formation can be measured and analyzed accurately and reliably by starting with the most fundamental atomic structure, so that high practicability is realized.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanocrystalline materials, belongs to the technical field of amorphous alloys, and relates to a technical method for characterizing the nanocrystallization characteristics of bulk amorphous alloys, in particular to a neutron diffraction characterization method for crystallization kinetic characteristics of bulk amorphous alloys . Background technique [0002] Bulk amorphous alloy is a new generation of metal materials with long-range disorder and short-range order structure. It has the characteristics of uniform structure and uniform composition, so that it has a series of excellent mechanical, physical and chemical properties, such as high strength and high hardness. , good processing and molding and other excellent characteristics, it has a wide range of applications in aerospace, military, medical equipment and other fields. [0003] Nanocrystallization of bulk amorphous alloys is a pro...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/207G01N25/20
CPCG01N23/2073G01N25/20
Inventor 徐勇徐丽丽商雨新谷子丰叶佳硕陈可欣武律久范明杰符根源石磊
Owner SHANDONG JIANZHU UNIV
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