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Method for comparing stress relaxation resistance of metal material

A metal material, anti-stress technology, applied in the direction of analyzing materials, testing material hardness, using stable tension/pressure testing material strength, etc., to achieve the effect of saving experiment time and cost

Inactive Publication Date: 2021-05-07
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But until now, there is still a lack of an effective criterion to accurately evaluate and compare the stress relaxation resistance of different copper alloys.

Method used

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  • Method for comparing stress relaxation resistance of metal material
  • Method for comparing stress relaxation resistance of metal material
  • Method for comparing stress relaxation resistance of metal material

Examples

Experimental program
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Effect test

Embodiment 1

[0024] In this example, Cu-Ni-Sn, Cu-Ni-Si, and Cu-Ni-Be alloys are used as examples to predict copper alloys with optimal stress relaxation resistance. The specific steps are as follows:

[0025] Step 1: Conduct quasi-static compression and Vickers indentation experiments at room temperature with a compression strain rate of 10 -3 the s -1 , the measured quasi-static compressive yield strength σ scs , and hardness HV (such as figure 1 and figure 2 shown);

[0026] Step 2: Compare the compressive yield strength and Vickers hardness of the three copper alloys, wherein the copper alloy with the highest yield strength and hardness is the Cu-Ni-Sn alloy. However, in the stress relaxation test under the two conditions, the Cu-Ni-Sn alloy has the best stress relaxation resistance, and the prediction is consistent with the experimental results (reference Figure 3-5 ).

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Abstract

The invention discloses a method for comparing stress relaxation resistance of a metal material, and belongs to the field of mechanical properties of materials. The method comprises the following two steps of: obtaining the quasi-static yield strength sigma y through a quasi-static mechanical experiment or obtaining the Vickers hardness HV through a Vickers indentation experiment, and obtaining the optimal stress relaxation resistance according to the evaluation standard of the stress relaxation resistance, namely when the strength (yield strength) of the alloy is maximum or the Vickers hardness of the alloy is highest. By utilizing the method, the stress relaxation resistance of the copper alloy can be simply and conveniently predicted, the experiment time and cost consumed by comparing the stress relaxation resistance effect are saved to a great extent, a rapid and reliable material selection method is provided, and the method has important reference significance for practical application of engineering. According to the method, the microscopic mechanism of the stress relaxation effect is further clarified, and a guiding effect is achieved on material selection of an electric contact component.

Description

technical field [0001] The invention relates to the technical field of mechanical properties of materials, in particular to a method for comparing stress relaxation resistance properties of metal materials. Background technique [0002] Copper alloys are widely used in electrical engineering due to copper's good electrical conductivity and ease of processing. However, with the development of my country's national economy and science and technology, there are higher requirements for the performance of copper alloys. Good electrical conductivity is no longer the only requirement for copper alloy components in some harsh service environments. High strength and high conductivity have become an important development direction of copper alloys. At present, the main high-strength and high-conductivity copper alloys are divided into the following categories: Cu-Be, Cu-Ni-Sn, Cu-Ni-Si. The fine second phase is dispersed in the copper matrix, which can increase the strength with le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/40
CPCG01N3/08G01N3/40G01N2203/0017G01N2203/0019G01N2203/0078G01N2203/0098
Inventor 张振军林浩然段启强张哲峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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