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Measurement method for bulk metallic glass structural relaxation activation energy

A technology of structural relaxation and metallic glass, applied in testing metals, measuring devices, instruments, etc., can solve the problem of less data, etc., and achieve the effect of intuitive data results and simple and convenient operation.

Active Publication Date: 2017-12-15
ZHEJIANG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, these methods are all measured at a few discrete holding time points, and the data can only be obtained after the material is cooled from the furnace. Using this method, the data obtained is less, and it is difficult to measure the structural relaxation activation of the bulk metallic glass. can

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  • Measurement method for bulk metallic glass structural relaxation activation energy
  • Measurement method for bulk metallic glass structural relaxation activation energy
  • Measurement method for bulk metallic glass structural relaxation activation energy

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Embodiment 1

[0056] The sample is composed of (Ti 36.1 Zr 33.2 Ni 5.8 be 24.9 ) 76 Cu 24 cast bulk metallic glass with figure 1 It is its differential scanning calorimetry curve, from which it can be obtained that the glass transition temperature of the bulk metallic glass of this composition is about 650K; after a sample with a diameter of 5mm is made by suction casting with a copper mold, it is cut, ground and polished Finally, clean the two end faces with absolute ethanol, and finally dry the ethanol with an ear wash ball. Then put it into the DIL 402C thermal dilatometer. After the chamber is ventilated 3 times, open the calibration curve that has been tested in advance, and run the test program of heating and heat preservation.

[0057] In 0.65-0.85 times the glass transition temperature (443K-548K), we selected 8 temperature points of 443K, 458K, 473K, 488K, 503K, 518K, 533K and 548K to test respectively. The obtained length change curve is attached as image 3 , where the ho...

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Abstract

The invention discloses a measurement method for bulk metallic glass structural relaxation activation energy. The method includes representation of bulk metallic glass structural relaxation behavior and measurement of relaxation activation energy. Representation of bulk metallic glass structural relaxation behavior includes cutting, grinding and polishing of a bulk metallic glass sample, and thermal insulation in a thermal dilatometer for measurement of the length change of the sample in structural relaxation. The measurement method of structural relaxation activation energy includes fitting processing of the sample's length change curve data of bulk metallic glass in isothermal structural relaxation, and calculation of the bulk metallic glass's relaxation structural activation energy with quasi-steady state relaxation state at different isothermal temperatures. According to the method provided by the invention, the bulk metallic glass sample is placed in the thermal dilatometer for thermal insulation, thus being conducive to in situ observation of the structural relaxation process, convenient calculation of the structural relaxation activation energy, and exploration of the metallic glass structural relaxation internal mechanism.

Description

technical field [0001] The invention relates to the technical field of a novel alloy-metallic glass, in particular to a method for measuring the relaxation activation energy of a bulk metallic glass structure. Background technique [0002] Metallic glass, also known as amorphous alloy, is a new member of the family of amorphous and metallic materials. In 1960, when Professor Duwez of Caltech was studying metal solid solutions, he used a high-speed rotating copper roller to cool the Au-Si alloy melt, and discovered this disordered alloy material for the first time. For more than 50 years since then, various large-sized bulk metallic glasses have been discovered one after another, among which Zr-based, RE-based, Fe-based bulk metallic glasses are easy to prepare due to their excellent mechanical properties, processability and soft magnetic properties. It has been widely used in the fields of structural devices, medical devices and soft magnetic cores. [0003] Metallic glass...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/20G01N33/38
CPCG01N33/20G01N33/386
Inventor 曹庆平肖劲韬蒋建中
Owner ZHEJIANG UNIV
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