Device for testing plastic deformation capacity of metal glass material

Abstract

A device for testing the plastic deformation capacity of a metal glass material comprises a lower mold. An upper mold is arranged in the lower mold. The upper mold and the lower mold are connected in a threaded mode. The upper mold and the lower mold are each provided with a central hole. A metal glass wafer sample is arranged between the central holes of the upper mold and the lower mold. A hard alloy ball is arranged on the metal glass wafer sample. A pressing rod is arranged on the upper face of the hard alloy ball. Pressure is exerted by the pressing rod on the hard alloy ball. The hard alloy ball exerts pressure on the metal glass wafer sample so that deformation and breakage appearance can be produced, and then the ductile-brittle performance of the metal glass wafer sample is achieved. The device has the advantages that the metal glass wafer sample required by the testing device is small in size and only has a diameter of 3*0.2 mm, and the requirement for testing the plastic deformation cavity of an ordinary metal glass material can be met; by means of the testing device, remarkable plastic deformation can be produced on tough metal glass, the ductile-brittle performance of different metal glass materials can be conveniently and rapidly distinguished, and the plastic deformation capacity and the ductile-brittle performance of metal glass can be judged only according to the stroke of the pressing rod.

Description

technical field [0001] The invention belongs to the field of metallic glass materials, in particular to a testing device for the plastic deformation ability of metallic glass materials. Background technique [0002] Since the birth of metallic glass materials, most of the methods for studying their plastic deformation ability use unidirectional compression or unidirectional tension. These two methods can only produce very limited shear bands in metallic glasses, so their plastic deformation is also very limited. For example, under uniaxial tensile load, metallic glasses generally undergo catastrophic failure along the main shear band, and it is impossible to obtain a stably extended shear band. The plastic deformation stability of metallic glass under uniaxial compression load is higher than that of uniaxial tensile load, and a certain number of shear bands can be obtained, but the requirements for the sample are stricter, and the upper and lower end faces must be absolutel...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and to provide a testing device for the plastic deformation ability of metallic glass materials by utilizing the principle of approximate biaxial tension near the stamping center when metal materials are stamped.

Images