Preparation and determination method of sample for compression of metal material with high thermal conductivity

Abstract

The invention relates to a preparation and determination method of a sample for compression of a metal material with high thermal conductivity. The preparation method comprises the following steps of I, preparing a metal cylinder by a sample of the metal material with high thermal conductivity, the metal cylinder having a diameter of [Phi]8 mm-[Phi]10 mm and a length of 10 mm-15 mm, and punching a point at an axial middle point position of the metal cylinder as a marker; II, drilling a blind hole with a diameter of [Phi]1.6 mm-[Phi]2.0 mm and a depth of 1.8 mm-2.2 mm; III, preparing a plug pin by selecting a wire made of a material the same metal cylinder or copper; and IV, putting a negative electrode end of an K-type thermocouple and a positive electrode end of the K-type thermocouple at two sides in the blind hole, and plugging the blind hole with the plug pin. The determination method comprises a step of measuring the sample on a thermodynamic simulation test machine to obtain a stress-strain curve of copper alloy. The preparation and determination method of the sample are simple and practicable; and flow stress test data results are 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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