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Method for improving mechanical properties of amorphous endogenous composite materials through amorphous matrix structural recovery

A technology of composite materials and amorphous alloys, applied in the field of amorphous alloys and their endogenous composite materials, can solve problems such as weak hardening ability and insufficient to compensate for softening effects, and achieve significant improvement in mechanical properties, simple implementation, and clear principles Effect

Active Publication Date: 2020-08-07
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

The endogenous β phase in β-type amorphous endogenous composites is usually a stable phase, and its plastic deformation mode is a dislocation mechanism, resulting in relatively weak hardening ability, which is not enough to compensate for the softening caused by the initiation and expansion of shear bands in the amorphous matrix effect, so most of the β-type amorphous endogenous composites show the phenomenon of processing softening, which also limits the application of such materials

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  • Method for improving mechanical properties of amorphous endogenous composite materials through amorphous matrix structural recovery
  • Method for improving mechanical properties of amorphous endogenous composite materials through amorphous matrix structural recovery
  • Method for improving mechanical properties of amorphous endogenous composite materials through amorphous matrix structural recovery

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Embodiment 1

[0050] In this embodiment, the diameter is 12mm and the nominal composition is Ti 47.4 Zr 34 Cu 6 Be 12.6 The X-ray diffraction spectrum and scanning electron microscopic morphology of the round rod of amorphous endogenous composite material are as attached figure 1 Shown. The component of endogenous metastable β is Ti 63.2 Zr 34.7 Cu 2.1 , Uniformly distributed in the amorphous matrix in the form of dendrites, with a volume fraction of about 60%. Cut a thin plate from the alloy rod to take a tensile specimen. The gauge length of the tensile specimen is 14mm×2mm×0.8mm. The strain rate of the tensile test is 5×10 -4 s -1 . Ti 47.4 Zr 34 Cu 6 Be 12.6 The tensile stress-strain curve of the amorphous endogenous composite material is attached image 3 As shown, its yield strength is about 780MPa, and it exhibits tensile work hardening ability after yielding, and its tensile fracture strain is 7.2±0.2%. Ti 47.4 Zr 34 Cu 6 Be 12.6 Because of the uniform microstructure of the amorphou...

Embodiment 2

[0053] In this embodiment, the diameter is 12mm and the nominal composition is Ti 47.4 Zr 34 Cu 6 Be 12.6 The X-ray diffraction spectrum and scanning electron microscopic morphology of the round rod of amorphous endogenous composite material are as attached figure 1 Shown. The component of endogenous metastable β is Ti 63.2 Zr 34.7 Cu 2.1 , Uniformly distributed in the amorphous matrix in the form of dendrites, with a volume fraction of about 60%. Cut a thin plate from the alloy rod to take a tensile specimen. The gauge length of the tensile specimen is 14mm×2mm×0.8mm. The strain rate of the tensile test is 5×10 -4 s -1 . Ti 47.4 Zr 34 Cu 6 Be 12.6 The tensile stress-strain curve of the amorphous endogenous composite material is attached image 3 As shown, its yield strength is about 780MPa, and it exhibits tensile work hardening ability after yielding, and its tensile fracture strain is 7.2±0.2% (see attached image 3 ). Ti 47.4 Zr 34 Cu 6 Be 12.6 Because of the uniform micro...

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Abstract

The invention relates to a method for improving mechanical properties of amorphous endogenous composite materials through amorphous matrix structural recovery, and belongs to the field of amorphous alloys and endogenous composite materials thereof. The amorphous endogenous composite materials have the microstructure characteristics that reversible phase change endogenous crystalline-state phases are distributed in an amorphous matrix. Under the action of a tensile load, the amorphous endogenous composite materials show super-elasticity, and that is shapes completely recover after small strainunloading. Tensile circulation loading is carried out at small strains, the structural recovery driven by ''shape memory effect'' happens to amorphous matrix phases in the amorphous endogenous composite materials. The amorphous matrix of the structural recovery can enable the mechanical properties of the amorphous endogenous composite materials to be improved, for example, the tensile plasticity is improved, and a work hardening stage is prolonged. According to the method, the mechanical properties of the amorphous endogenous composite materials can be improved, so that the practical application of the amorphous endogenous composite materials being used as the structural materials is expanded, and important socioeconomic benefits are achieved.

Description

Technical field [0001] The invention relates to a method for improving the mechanical properties of an amorphous endogenous composite material through the restoration of an amorphous matrix structure, including the microstructure characteristics and mechanical performance characteristics of the amorphous endogenous composite material, an amorphous matrix structure restoration mechanism and an implementation method, belonging to Amorphous alloys and their endogenous composite materials. Background technique [0002] Amorphous alloys have excellent mechanical properties such as high strength, high hardness, and large elastic limit, and have the prospect of being widely used as structural materials. However, bulk amorphous alloys have no macroscopic tensile ductility at room temperature, which severely limits the wide application of amorphous alloys as structural materials. Studies have shown that the energy state and structure of amorphous alloys are closely related to their mecha...

Claims

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Application Information

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IPC IPC(8): C22F1/18C22C45/10
CPCC22C45/10C22F1/006C22F1/18
Inventor 张龙张海峰朱正旺张宏伟付华萌李宏王爱民
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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