In situ exafs characterization method for crystallization kinetics of amorphous alloys
A kinetic characteristic, amorphous alloy technology, applied in the field of in-situ EXAFS characterization of amorphous alloy crystallization kinetic characteristics, and the characterization of amorphous alloy nanocrystalline characteristics, can solve the problem of inability to analyze the microscopic crystallization mechanism and Atomic Migration and Diffusion Laws and other issues
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[0026] The test adopts the atomic percentage as Zr 48 Cu 36 Al 8 Ag 8 amorphous alloys.
[0027] a. Select the nominal composition as Zr 48 Cu 36 Al 8 Ag 8 (at.%) amorphous alloy as the object, through vacuum arc melting (repeated smelting 5 times) and vacuum stripping to obtain a 5 × 400mm bulk amorphous alloy, cutting and thinning it into a thin sheet alloy of 3mm × 3μm sample;
[0028] b. Place the sample in the optical path of synchrotron radiation (wavelength 0.01nm) for in-situ isothermal crystallization, the processing temperature is 470°C, and the radiation data collection frequency is 6min, to obtain the EXAFS absorption line I of the alloy M (2θ), see appendix figure 1 , each data point in the figure comes from the experimental data of annealing every 6 minutes;
[0029] c. Correct and convert the obtained absorption spectrum data to obtain the interference function I(Q) of the alloy, and perform Fourier transformation to obtain the reduced radial distribut...
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