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Experimental method for measuring high-temperature mechanical-chemical coupling of material by utilizing nanoindentor

A technology of nano-indentation instrument and experimental method, which is applied in the direction of testing material hardness, nanotechnology, and preparation of test samples, etc., which can solve the problems of limited oxidation mechanism and difficulty in investigating the oxidation behavior of materials.

Active Publication Date: 2015-03-04
TSINGHUA UNIV
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Problems solved by technology

However, in the current research, it is limited to study the oxidation mechanism through the mechanical-chemical coupling method, and it is difficult to investigate the oxidation behavior of materials under different stress states on the same specimen.

Method used

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  • Experimental method for measuring high-temperature mechanical-chemical coupling of material by utilizing nanoindentor
  • Experimental method for measuring high-temperature mechanical-chemical coupling of material by utilizing nanoindentor
  • Experimental method for measuring high-temperature mechanical-chemical coupling of material by utilizing nanoindentor

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Experimental program
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Embodiment

[0027] a. Prepare a nickel-based alloy material test piece, and grind and polish the surface of the test piece to meet the standard of high-temperature nano-indentation test on the surface finish of the test piece;

[0028] b. Heat up the operating table of the nanoindenter to 600°C; the determination of the temperature is based on several explorations in the experiment. Experiments were carried out at 400°C, 600°C and 800°C, and finally it was found that 600°C is more suitable for research The temperature of the oxidation behavior of Ni-based superalloys under different stress states;

[0029] c. After the temperature reaches 600°C, use the Berkovich indenter of the nano-indenter to perform an indentation experiment on the surface of the specimen at 11000 μN. After obtaining the indentation on the surface of the specimen, keep the indenter in contact with the substrate of the specimen for 60 minutes. Oxidize the material under stress;

[0030] d. Cut the test piece, obtain t...

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Abstract

The invention discloses an experimental method for measuring the high-temperature mechanical-chemical coupling of a material by utilizing a nanoindentor, and belongs to the technical field of engineering materials, structural deformation and experiments in mechanics. The experimental method is technically characterized by comprising the following steps: performing an indentation experiment on a polished surface of a test piece after the temperature reaches a target temperature by utilizing a high-temperature environment provided by a nanoindentor, so as to obtain an indentation on the surface of the test piece, and maintaining the contact between a pressing head and the indentation, so that the material is oxidized in a certain time under the stress conditions; and analyzing and measuring the tensile stress of a pressing head action area on the surface of the material and the oxide layer thickness of a compressive stress area by virtue of a transmission electron microscope and an energy dispersion X-ray spectrometer after the experiment is ended, and calculating the oxidation rate of the material in different stress states. According to the experimental method disclosed by the invention, the oxidation rate of the material in the different stress states is measured under the micron and nano scales according to the specific experimental analysis result of the nanoindentor, and the mechanical-chemical coupling process and performance of the material are evaluated.

Description

technical field [0001] The invention relates to an experimental method for measuring high-temperature mechanical-chemical coupling of materials by using a nano-indenter, and belongs to the technical fields of engineering materials, structural deformation and mechanical experiments. Background technique [0002] Materials are the foundation of human material civilization, and it supports the advancement of other new technologies. Various structural and functional materials are needed in national economic production fields such as aerospace, marine engineering, life science and system engineering. With the development of science and technology and the realization of some extreme conditions, various new materials are rapidly developed and widely used in high-tech fields, and the requirements for the reliability and performance of the materials used are more stringent. For example, in the field of aerospace thermal protection, the theoretical and experimental research on the oxi...

Claims

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Application Information

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IPC IPC(8): G01N3/54B82Y35/00G01N1/32
Inventor 冯雪方旭飞李燕
Owner TSINGHUA UNIV
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