A kind of sample preparation and determination method of high thermal conductivity metal material compression

Abstract

The invention relates to a sample preparation and measurement method for compression of a metal material with high thermal conductivity. The preparation method includes the following steps in sequence: Ⅰ. Take a high thermal conductivity metal material sample to make a metal cylinder. The diameter of the metal cylinder is Ф8 mm to Ф10 mm, and the length is 10 mm to 15 mm. Point as a mark; Ⅱ. Drill a blind hole with a diameter of Ф1.6mm to Ф2.0mm and a depth of 1.8mm to 2.2mm at the mark; Ⅲ. Select a wire material of the same material as the metal cylinder or copper material to make a plug pin; Ⅳ. Place the negative end of the K-type thermocouple wire and the positive end of the K-type thermocouple wire on both sides of the blind hole, and plug the blind hole with a plug pin. The measurement method is to measure the sample on a thermodynamic simulation testing machine to obtain the stress-strain curve of the copper alloy. The process of sample preparation and measuring method of the present invention is simple and easy, and the result of rheological stress test data is accurate and stable.

Description

technical field [0001] The invention relates to a sample preparation and measurement method for compression of a metal material with high thermal conductivity. Background technique [0002] The thermodynamic simulation testing machine can simulate the thermal deformation process of metal materials at high temperature, involving basic research work and production process simulation of high temperature mechanical performance parameters, thermoplasticity, microstructure and phase transition behavior during deformation, and can be used for metal materials in Static recrystallization and dynamic recrystallization, deformation resistance, etc. during high temperature deformation are studied to provide theoretical and experimental basis for thermal processing of metal materials. [0003] Usually, the high-temperature flow stress test of steel materials is carried out on the Gleeble series thermodynamic simulation testing machine, and the thermocouple is welded on the surface of the...

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Problems solved by technology

[0004] The spot welding machine used with the thermodynamic simulation test machine can reliably complete the welding task manually when welding metal materials such as steel, but when welding non-ferrous metals with high electrical conductivity and high thermal conductivity, due to the thermal conductivity of such metal materials It is 7~11 times larger than steel materials, and the heat input energy is dissipated too quickly and cannot be gathered instantly. The spot welding machine cannot be used alone in the laboratory to complete the welding of the thermocouple on the surface of the sample.

Generally, such non-ferrous metal materials need to be preheated at 400°C~500°C before welding, so that the subsequent welding process can be carried out. After heating, the 400℃~500℃ sample is welded on the surface of the sample by the thermocouple on the spot welding machine, and the preheated sample will also burn the working anvil of the spot welding machine

[0005] There are many published documents on the high-temperature flow stress test of copper alloys performed by thermodynamic simulation testing machines, but none of the documents mentions how the "welding" of copper alloy samples and thermocouples is realized. Therefore, in order to realize this kind of For the application of metal materials with high thermal conductivity on thermodynamic simulation testing machines, it is necessary to study a low-cost, easy-to-operate method for preparing samples for thermal simulation compression tests for metal materials with high thermal conductivity

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