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Method for nano-crystallization of Zr-based amorphous alloy induced by nanoindentation combined with fatigue load

An amorphous alloy, fatigue load technology, applied in material analysis using radiation diffraction, using stable tension/pressure testing material strength, measuring devices, etc., can solve the limitations of increasing the crystallization of amorphous alloys, complex processes, Adapt to the problem of small surface, to achieve the effect of improving the efficiency of nano-crystallization, speeding up the experimental process and low cost

Active Publication Date: 2019-08-13
JILIN UNIV
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Problems solved by technology

Although the above four crystallization methods can cause crystallization of amorphous alloys, they have defects such as small adaptability, high cost, complicated process, and easy generation of impurities, which increase the limitations of crystallization of amorphous alloys.

Method used

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  • Method for nano-crystallization of Zr-based amorphous alloy induced by nanoindentation combined with fatigue load
  • Method for nano-crystallization of Zr-based amorphous alloy induced by nanoindentation combined with fatigue load
  • Method for nano-crystallization of Zr-based amorphous alloy induced by nanoindentation combined with fatigue load

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Embodiment

[0029] A plate-shaped dog-bone-shaped specimen containing double V defects is prepared by slow-moving wire-cutting of a large amorphous alloy rod-shaped raw material, see figure 1 As shown, the two sides of the test piece are designed as regular hexagons, the gauge length of the test piece is 3.5mm, the width is 1.2mm, the thickness is 0.6mm, the longitudinal depth of the V-shaped defect is 0.5mm, and the V-shaped angle is 40° , the transverse distance of the tip of the double V defect is 1mm, and the supporting fixture is also processed into a hexagonal groove and a hexagonal wedge-shaped surface consistent with the size of the test piece. The surface of the test piece is first polished with sandpaper of different meshes, and then mechanically polished on a polishing machine to obtain a sufficiently smooth and bright surface. The polishing liquid used is a diamond polishing liquid with a concentration of 10% and a particle size of 0.1 μm. The polishing speed is 100rad / min, an...

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Abstract

The invention relates to a method for nano-crystallization of a Zr-based amorphous alloy induced by nanoindentation combined with fatigue load, and belongs to the field of amorphous alloy modification. An original test piece with double V-notch is subjected to XRD test, the test piece is subjected to a tensile experiment by using a high-temperature fatigue tester, pre-tensile loadsare applied to both ends of the test piece, meanwhile fatigue loads are applied through piezoelectric stack on one side of the test piece until the test piece is broken,and the XRD pattern of the test piece after breakage shows a steamed break-like diffuse peak and indicates thatthe test piece after fatigue break does not crystallize; a indentation test is carried out on the test piece after the fatigue break, and the indentation with the most serious plastic accumulation is selected from an indentation topography and subjected to FIB cutting to obtain a TEM sample. The crystallization phenomena at differentdistances from the inclined surface of the indentation are observed by an electron diffraction pattern, and the precipitation of nanocrystals in the amorphous alloy is observed by TEM bright / dark field imaging;and the steps are repeated in the test piece after tensile failureto observea TEM dark field image.

Description

technical field [0001] The invention relates to the technical field of crystallization of amorphous alloys, in particular to a method for inducing nanocrystallization of Zr-based amorphous alloys by combining nanoindentation with fatigue load. The invention performs local nano-indentation treatment on the amorphous alloy specimen after tensile fatigue fracture, and induces the amorphous alloy to produce nano-precipitated phases. Materials offer new approaches. Background technique [0002] Bulk amorphous alloy, also known as bulk metallic glass, has a structure different from ordinary crystalline metal materials on the atomic scale. Compared with the long-range orderly arrangement of atoms in ordinary crystalline materials, a large number of diffraction experiments have confirmed that its atomic arrangement is not periodic. There is no long-range order, and there are no lattice defects that are common in crystal materials such as dislocations and grain boundaries. Because o...

Claims

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Application Information

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IPC IPC(8): G01N3/18G01N3/04G01N23/20058G01N23/2005
CPCG01N3/04G01N3/18G01N23/20G01N23/2005G01N2203/0067G01N2203/0073
Inventor 马志超张微马筱溪赵宏伟任露泉
Owner JILIN UNIV
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