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Method for driving amorphous alloy to achieve rejuvenation by applying cyclic loading mode

A technology of cyclic loading and amorphous alloys, which is applied in the field of amorphous alloy materials, can solve problems such as poor effects, and achieve the effects of promoting rejuvenation, good rejuvenation effects, and decreased hardness

Active Publication Date: 2020-09-25
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is less effective for more brittle amorphous alloys, such as La-based amorphous alloys, and a milder loading method is needed to promote the rejuvenation of more brittle amorphous alloys and improve their plasticity

Method used

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  • Method for driving amorphous alloy to achieve rejuvenation by applying cyclic loading mode
  • Method for driving amorphous alloy to achieve rejuvenation by applying cyclic loading mode
  • Method for driving amorphous alloy to achieve rejuvenation by applying cyclic loading mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of La 60 Ni 25 al 15 Amorphous alloy plate: La, Ni and Al with a purity of ≥99.9% are mixed according to the atomic percentage of 60:25:15, and then melted in an electric arc melting furnace under the protection of a high-purity argon atmosphere. Repeat smelting 5 times to form an alloy ingot. Using the method of vacuum suction casting, the alloy ingot is melted and sucked into a copper mold, wherein the size of the copper mold is 65x5x2mm, and a La-based amorphous alloy sample is prepared.

[0026] (2) Preliminary treatment: wire-cut the amorphous alloy block obtained in step (1) into a block sample with a size of 40x2x1mm, use #400-#2000 sandpaper to grind the upper and lower bottom surfaces of the strip sample from small to large, Then it is polished to a mirror surface, and annealed at 100° C. for 1 hour under the protection of nitrogen.

[0027] (3) Single cantilever beam cyclic loading treatment: place the sample on the Q800 DMA single cantilev...

Embodiment 2

[0031] Figure 4 It is the hardness distribution on the surface of the annealed lanthanum-based amorphous alloy sample before and after 2 hours of cyclic loading with a span of 5 mm and a frequency of 10 Hz in the present invention. Figure 4 Area 1 is close to the fixed end, area 4 is close to the free end, and the interval between the center points of the area is 1mm. It can be seen from the figure that the hardness of the sample is uniformly distributed when it is not loaded, and after loading, it is close to the fixed end. The hardness of the area decreased by 26% relative to that before cyclic loading.

[0032] The present invention provides a method for driving rapid rejuvenation of an amorphous alloy, the steps of which are basically the same as in Embodiment 1, the difference being that the span of a single cantilever beam is 5mm.

[0033] Result detection:

[0034] The rejuvenated lanthanum-based amorphous alloy sample was used for nanoindentation test, and the surf...

Embodiment 3

[0036] The present invention provides a method for driving rapid rejuvenation of amorphous alloys, the steps are basically the same as those in Example 1, the difference is that the lanthanum-based amorphous alloy is loaded with a single cantilever beam with a span of 5mm, and the temperature is controlled to cycle at 200K It took 1 hour to load. Result detection: The nano-indentation test was carried out on the rejuvenated lanthanum-based amorphous alloy sample, and it was found that the hardness decreased near the fixed end, but the hardness decreased by 5%.

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Abstract

The invention discloses a method for driving amorphous alloy to achieve rejuvenation by applying a cyclic loading mode, and belongs to the field of amorphous alloy materials. The method comprises thefollowing steps that (1) a clean La-based amorphous alloy sample is selected; (2) single cantilever beam cyclic loading treatment is carried out on the sample, wherein the sample is placed on a Q800 DMA single cantilever beam clamp, 5N of torsion is applied to the fixed end of the clamp, the free end is ensured to enable the clamp to be tightly attached, a shell is closed, nitrogen protective gasis introduced, the vibration frequency is set to be 10 Hz, the temperature is set to be 30 DEG C, and the time is set to be 2 hours; and (3) surface hardness analysis is carried out on the amorphous alloy block sample subjected to cyclic loading through a nanoindenter, and after cyclic loading after a certain stress is achieved, the surface hardness is reduced by 20%. The loading mode also has a good rejuvenation effect on amorphous alloy with high brittleness, and a new idea and scheme are provided for further improving the plastic deformation capacity of the amorphous alloy.

Description

technical field [0001] The invention belongs to the field of amorphous alloy materials, and in particular relates to a method for driving the rejuvenation of amorphous alloys in a cyclic loading manner. Background technique [0002] Amorphous alloys (also known as metallic glasses) are a new class of amorphous materials accidentally discovered more than 50 years ago. Unique and interesting mechanical, chemical and physical properties that have proven academic and practical value. For example, due to the lack of dislocation defects in the disordered lattice structure, the strength and elastic limit of most amorphous alloys are much higher than those of traditional crystalline alloys and other engineering materials, and they have good wear and corrosion resistance at room temperature sex. [0003] However, also due to the amorphization of this structure, some challenging issues arise, such as room temperature embrittlement, etc., which seriously hinder the application of amo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/16C22F1/02C22C45/00
CPCC22C45/00C22F1/02C22F1/16
Inventor 黄平刘震王飞
Owner XI AN JIAOTONG UNIV
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