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Method for manufacturing and testing ideal cracks of metal material

A technology of metal materials and testing methods, applied in the field of materials, achieves the effects of low cost, low equipment requirements, and strong controllability

Inactive Publication Date: 2020-06-23
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the fact that the current rapid cooling technology is still difficult to produce large-sized bulk amorphous alloys, the requirements of the plane strain fracture toughness test on the sample geometry are still a challenge for most amorphous alloys

Method used

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  • Method for manufacturing and testing ideal cracks of metal material
  • Method for manufacturing and testing ideal cracks of metal material
  • Method for manufacturing and testing ideal cracks of metal material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Test amorphous alloy LM-1 (Zr 41.2 Ti 13.8 Cu 12.5 Ni 10 Be 22.5 ) Fracture toughness of a 2mm thick fracture specimen, including steps:

[0065] 1. According to the needs of the experiment, cut the bulk amorphous alloy into several pieces, Figure 5a It is a strip-shaped amorphous alloy sample after cutting.

[0066] 2. Mark the surface of the amorphous alloy material to ensure that the cutting is vertical and the cutting range is exactly half of the width of the sample. Use a 0.25mm diamond wire to wire-cut the sample so that there is a unilateral gap in the sample. Figure 5b It is the amorphous alloy sample after wire cutting.

[0067] 3. According to the amorphous alloy Zr 41.2 Ti 13.8 Cu 12.5 Ni 10 Be 22. The glass temperature of 5 preset heating temperature is 405 ℃.

[0068] 4. Stack 40μm thick stainless steel substrate, stainless steel pressure transmission parts, and 3.5mm thick Zr respectively from bottom to top 41.2 Ti 13.8 Cu 12.5 Ni 10 Be ...

Embodiment 2

[0075] Test amorphous alloy LM-1 (Zr 41.2 Ti 13.8 Cu 12.5 Ni 10 Be 22.5 ) Fracture toughness of 0.5mm thick fracture specimen, including steps:

[0076] 1. According to the needs of the experiment, cut the bulk amorphous alloy into several pieces.

[0077] 2. Mark the surface of the amorphous alloy material to ensure that the cutting is vertical and the cutting range is exactly half of the width of the sample. Use a 0.25mm diamond wire to wire-cut the sample so that there is a single-sided gap in the sample.

[0078] 3. According to the amorphous alloy Zr 41.2 Ti 13.8 Cu 12.5 Ni 10 Be 22.5 The glass state temperature of the preset heating temperature is 405°C.

[0079] 4. Stack 40μm thick stainless steel substrate, stainless steel pressure transmission parts, and 1mm thick Zr respectively from bottom to top 41.2 Ti 13.8 Cu 12.5 Ni 10 Be 22.5 Materials, stainless steel pressure parts, 40μm thick stainless steel substrate.

[0080] 5. Place the stack as a whole o...

Embodiment 3

[0086] Test amorphous alloy LM-1b (Zr 44 Ti 11 Cu 10 Ni 10 Be 25 ) Fracture toughness of 0.2mm thick fracture specimen, including steps:

[0087] 1. According to the needs of the experiment, cut the bulk amorphous alloy into several pieces.

[0088] 2. Press the amorphous alloy into the silicon mold by thermoplastic molding.

[0089] 3. According to the amorphous alloy Zr 44 Ti 11 Cu 10 Ni 10 Be 25 The glass state temperature of the preset heating temperature is 420°C.

[0090] 4. Stack 40μm thick stainless steel substrate, tungsten pressure transmission parts, and 350um thick Zr respectively from bottom to top 44 Ti 11 Cu 10 Ni 10 Be 25 Material, tungsten pressure transmission part, 40μm thick stainless steel substrate.

[0091] 5. Put the stack as a whole on the flat surface fixture of the universal testing machine to heat and stabilize the temperature at 420°C (the flat surface fixture is heated by resistance wire, and its temperature can be precisely adjust...

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Abstract

The invention discloses a method for manufacturing and testing ideal cracks of a metal material. The manufacturing method comprises the following steps: processing the metal material into a flat plate; prefabricating notch cracks in the flat plate; placing pressure transmission pieces on the two surfaces of the flat plate to form a sandwich structure, wherein a contact range of the pressure transmission pieces and the flat plate covers the notch cracks; and heating and pressurizing the sandwich structure so that a thickness of the range of the notch cracks on the flat plate is reduced, and notch crack surfaces are folded again to form an ideal crack surface similar to fatigue cracks. Prefabricating of the ideal cracks is achieved through a thermoplastic forming characteristic of the metalmaterial, an effective technical basis is provided for measurement of the amorphous alloy plane strain fracture toughness, the measurement of the small sample material plane strain fracture toughnessis facilitated, deformation in an ideal crack tip expansion process is conveniently monitored, a process is simple, and cost is low.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for preparing and testing an ideal crack of a metal material. Background technique [0002] Amorphous alloy is a metastable material obtained by rapid cooling of metal at the temperature of its supercooled liquid phase region. It has excellent properties such as thermoplasticity, high elasticity, high strength, high hardness, soft magnetic properties, corrosion resistance and wear resistance, and is very There is no plastic deformation mechanism such as dislocation slip in crystal alloys, and its unique shear band deformation mode presents the phenomenon of brittle fracture at room temperature macroscopically. This phenomenon leads to great challenges in the fracture toughness test of amorphous alloys. [0003] Prefabricated ideal cracks are the standard method for plane strain fracture toughness testing. The existing ideal cracks are obtained by fatigue lo...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N1/28
CPCG01N1/28G01N3/08
Inventor 刘泽谢怡玲
Owner WUHAN UNIV
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