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A method for judging whether an amorphous alloy is crystallized

An amorphous alloy and crystallization technology, which is used in the field of quickly judging whether amorphous alloy products are qualified or not, and can solve the problems of long detection cycle, complex judgment, and troublesome sample preparation.

Active Publication Date: 2019-07-26
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Both X-ray detection and DTA detection have sample preparation troubles, long detection cycle, and high detection cost, which is not conducive to large-scale application in production
[0006] However, the use of mechanical properties to detect whether the amorphous is crystallized is currently mostly destructive testing, and it is more easily affected by internal tissue defects such as pores and slag inclusions, making it more complicated to judge.

Method used

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  • A method for judging whether an amorphous alloy is crystallized
  • A method for judging whether an amorphous alloy is crystallized

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Zr, Al, Cu, Ni with a purity of 99.0% by weight are used as Zr 55 Al 10 Ni 5 Cu 30 For proportioning, argon with a purity of 99.0% by volume is used as a shielding gas and melted for 4 minutes at 1100° C. to completely melt the alloy raw material. The melt is cast into a copper mold for water cooling at a cooling rate of 102K / s. Five round rods with different diameters were produced by gravity casting, with diameters of 3mm, 5mm, 7mm, 9mm and 10mm respectively, marked as sample B1, sample B2, sample B3, sample B4, sample B5; induction melting, die casting method Three sample strips were prepared, with thicknesses of 0.5mm, 1.5mm, and 10mm respectively, labeled as sample B6, sample B7, and sample B8. These samples were subjected to Vickers hardness test and flexural strength test. A Vickers reference hardness W1 is calculated according to the test results.

Embodiment 2

[0040] Same as Example 1, the difference is that the sample B1, sample B2, sample B3, and sample B5 of the above-mentioned example 1 of gravity casting are taken, and the corresponding diameters are 3mm, 5mm, 7mm, and 10mm respectively; the spline 2 prepared by the die-casting method A sample B6 and a sample B7 have corresponding thicknesses of 0.5mm and 1.5mm respectively, and a Vickers reference hardness W2 is calculated according to the test results.

Embodiment 3

[0042] Same as in Example 1, the difference is that there are 4 sample bars prepared by the die-casting method, including sample B9 with a thickness of 3 mm. Vickers hardness test and flexural strength test were carried out on sample B9. A Vickers reference hardness W3 is calculated according to the test results.

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Abstract

The invention provides a method for determining crystallization of an amorphous alloy. The method comprises the following steps: preparing at least four round amorphous alloy bars with different diameters by using a casting method and preparing at least two sample strips by using a die-casting method; then determining the Vickers hardness and bending strength of above amorphous alloys, analyzing the bending strength of the amorphous alloys and ranking the amorphous alloys according to a sequence of from higher bending strength to lower bending strength; if the bending strength of a certain amorphous alloy is less than 70% of the bending strength of adjacent amorphous alloys, setting the mean value of the Vickers hardness of the amorphous alloy and the Vickers hardness of the adjacent amorphous alloys as reference critical Vickers hardness for a crystalline alloy; and determining to-be-determined alloys with Vickers hardness greater than the reference critical Vickers hardness as amorphous alloys and determining to-be-determined alloys with Vickers hardness less than the reference critical Vickers hardness as crystalline alloys. The determination method provided by the invention is convenient to operate, fast in detection speed and low in cost; and the method is a nondestructive testing method and especially applicable to quality monitoring of workshop production.

Description

technical field [0001] The invention relates to a method for crystallization of an amorphous alloy, more particularly to a method for quickly judging whether an amorphous alloy product is qualified during production. Background technique [0002] Amorphous alloys refer to the microstructure of various substances in nature can be divided into two categories according to the arrangement of their constituent atoms: ordered structure and disordered structure. Crystals are typically ordered structures, while gases, liquids, and amorphous solids are disordered structures. Amorphous alloys are solidified by ultra-rapid cooling. When the alloy is solidified, the atoms do not have time to arrange and crystallize in an orderly manner. The obtained solid alloy has a long-range disordered structure, and there are no grains and grain boundaries of the crystalline alloy. [0003] Amorphous alloys have extremely high strength, hardness, wear resistance, corrosion resistance and high elect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/00
CPCG01N3/00
Inventor 文丹华
Owner BYD CO LTD
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