Bulk metal glass composite material with stretching plasticity and work hardening capacity

A work hardening, bulk metal technology, applied in the field of bulk metal glass composite materials, can solve the problems of inability to obtain engineering applications, no bearing capacity, strain softening, etc., and achieve the effects of safe use, convenient preparation, and large plastic deformation capacity.

Active Publication Date: 2010-07-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Compared with conventional crystalline metal materials, the atomic arrangement of metallic glass materials has no periodicity and shows the characteristics of long-range disorder, so the deformation is not carried out in the mode of dislocation, but in the mode of local shear band; this deformation The characteristics make metallic glass have high hardness, strength, and large elastic modulus, but also cause its biggest disadvantage: room temperature brittleness and strain softening, which seriously restrict its application as engineering materials
The characteristics of strain softening make the metallic glass composite materials break rapidly after yielding, without subsequent bearing capacity, so this kind of metallic glass composite materials still cannot obtain practical engineering applications

Method used

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  • Bulk metal glass composite material with stretching plasticity and work hardening capacity
  • Bulk metal glass composite material with stretching plasticity and work hardening capacity
  • Bulk metal glass composite material with stretching plasticity and work hardening capacity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Preparation (Zr 0.5 Cu 0.5 ) 100-x al x Ternary Metallic Glass Composites

[0041] Adopt commercially available purity to be higher than 99.9% (percentage by weight) common pure metal Zr, Cu, Al press composition formula (Zr 0.5 Cu 0.5 ) 100-x al x (Atomic molar ratio, 0≤x≤10) ratio is well matched, and test rods with different diameters are suction-cast. With the change of Al content, the amorphous forming ability of the alloy will change, and the cooling rate of the prepared sample is different with the different suction casting diameter. figure 1 is Zr 48 Cu 48 al 4 X-ray diffraction patterns of alloy samples with different suction casting diameters. It can be seen that when the suction casting diameter is small, that is, when the cooling rate is high, the obtained sample structure is a fully amorphous structure; as the suction casting diameter increases, that is, the cooling rate decreases, the amorphous matrix begins to The body-centered cubic B2-CuZr p...

Embodiment 2

[0044] (Zr 0.5 Cu 0.5 ) 100-x al x Influence of Adding Doping Elements in Ternary Alloy System

[0045] In the alloy system provided by the present invention, the doping of other elements will significantly change the structure and properties of the alloy. Figure 5 is Zr 48 Cu 48 al 4 The X-ray diffraction pattern of the 3mm test rod doped with different contents of Fe in the medium, wherein, the abscissa is the 2θ angle; the ordinate is the diffraction intensity (arbitrary unit), and the structure of the 3mm test rod compared with the suction casting can be It can be seen that after the addition of 0.5% Fe element, the B2-CuZr phase in the test bar is reduced, and it is close to a completely amorphous structure, indicating that the amorphous forming ability of the alloy has increased. When the addition of Fe element reaches 1%, the B2-CuZr phase in the test bar increases, indicating that the amorphous formation ability of the alloy is reduced compared with that of 0.5...

Embodiment 3

[0047] Preparation of Zr with crystal phase volume fraction of 30% 48 Cu 47.5 al 4 co 0.5 Amorphous composite material

[0048] Commercially available pure metals Zr, Cu, Al, and Co with a purity higher than 99.9% (weight percent) are prepared in an atomic ratio of 48:47.5:4:0.5, and firstly arc smelted under an argon atmosphere protected by a titanium ingot , each alloy ingot needs to be smelted more than 5 times to ensure that the composition of the master alloy is uniform. Then take an appropriate amount of master alloy material and place it on the top of the water-cooled copper mold, re-melt the alloy melt by electric arc under the argon or helium atmosphere, and suck and cast the alloy melt into the lower water-cooled copper mold. The inner cavity diameter of the copper mold is 3mm. Figure 7 It is Zr with copper mold suction casting diameter of 3mm 48 Cu 48 al 4 、Zr 48 Cu 47.5 al 4 co 0.5 Alloy and Zr with a diameter of 5mm 47 Cu 47 al 6 The cross-sectiona...

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Abstract

The invention relates to a bulk metal glass composite material with stretching plasticity and work hardening capacity. A crystal phase capable of producing phase change is generated in the metal glass during deforming by alloy component control and cooling speed adjustment, and the crystal phase is deformed to produce the phase change so as to prepare the composite material. The bulk metal glass composite material with the stretching plasticity and work hardening capacity is prepared by taking common pure metal elements as main components, mixing the materials according to an atomic percentage expressed by an alloy component expression, and smelting and suction casting. The bulk metal glass composite material contains 10 to 60 volume percent of crystals. The bulk metal glass composite material of the invention can undergo the phase change during deforming, has higher strength and compression plasticity, particularly has higher stretching plasticity and work hardening capacity, and can meet the requirement of practical engineering application; therefore, the composite material has quite broad engineering application prospect.

Description

technical field [0001] The invention relates to the field of amorphous alloys, in particular to a block metal glass composite material with large tensile plasticity and excellent work hardening ability obtained through proper composition design and cooling rate adjustment. Background technique [0002] Compared with conventional crystalline metal materials, the atomic arrangement of metallic glass materials has no periodicity and shows the characteristics of long-range disorder, so the deformation is not carried out in the mode of dislocation, but in the mode of local shear band; this deformation The characteristics make metallic glass have high hardness, strength, and large elastic modulus, but also cause its biggest disadvantages: room temperature brittleness and strain softening, which seriously restrict its application as engineering materials. After years of hard work by researchers, some metallic glass systems with certain room temperature compressive plasticity have b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C45/10B22D18/06
Inventor 吴渊吕昭平陈国良惠希东张勇
Owner UNIV OF SCI & TECH BEIJING
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