A method for real-time measurement of material oxidation rate using nanoindentation topography

Abstract

The invention relates to a method for real-time measurement of the oxidation rate of a material by using a nanoindentation shape and belongs to the technical field of engineering materials, structural deformation and mechanical experiments. The method provided by the invention is technically characterized in that the indentation shape of a surface marker of the material is scanned in real time by virtue of an imaging function of a scanning probe microscope of a nanoindentor so as to measure the room temperature of the material and the oxidation rate of the material under a high-temperature condition; the method comprises the following steps: firstly, carrying out indentation experiment on the surface of the material; using residual indentation as a mark indentation; after the material is started to be oxidized, carrying out real-time online scanning and recording on the shape of the mark indentation by virtue of the imaging function of the scanning probe microscope of the nanoindentor; analyzing the shape of the mark indentation; extracting data use for calculation; calculating by virtue of a formula so as to measure the oxidation rate of the material. The method is obtained based on a specific experimental analysis result, thereby providing a novel method for researching oxidation behaviors of materials at different temperatures at micro-nano scale.

Description

technical field

[0001] The invention relates to a method for measuring the oxidation rate of a material in real time by using nano-indentation morphology, 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, with the development of engines with high thrust-to-weight ratios, ...

Examples

Embodiment

[0043] a. Prepare the niobium 521 alloy material test piece, and polish the surface of the test piece to meet the requirements of the high-temperature nano-indentation test on the surface finish of the test piece;

[0044] b. Use the high-temperature Berkovich indenter of the high-temperature nanoindenter to press a 146nm-deep marking indentation on the surface of the test piece with a load of 7250uN at room temperature;

[0045] c. Heat the test piece to 100°C, 200°C, 300°C, 400°C, 500°C, 600°C, 700°C, the material is oxidized at high temperature, and the marked indentation is scanned in real time and in situ at each temperature point Record;

[0046] d. Use software to extract the depth h of the marking indentation at different times and the average value a of the lengths of the three sides from the real-time shape information of the marking indentation;

[0047] e. Since the thermal expansion rate of niobium 521 alloy is very small, the dimensional change caused by tempera...

technical field

[0001] The invention relates to a method for measuring the oxidation rate of a material in real time by using nano-indentation morphology, 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, with the development of engines with high thrust-to-weight ratios, ...

Examples

Embodiment

[0043] a. Prepare the niobium 521 alloy material test piece, and polish the surface of the test piece to meet the requirements of the high-temperature nano-indentation test on the surface finish of the test piece;

[0044] b. Use the high-temperature Berkovich indenter of the high-temperature nanoindenter to press a 146nm-deep marking indentation on the surface of the test piece with a load of 7250uN at room temperature;

[0045] c. Heat the test piece to 100°C, 200°C, 300°C, 400°C, 500°C, 600°C, 700°C, the material is oxidized at high temperature, and the marked indentation is scanned in real time and in situ at each temperature point Record;

[0046] d. Use software to extract the depth h of the marking indentation at different times and the average value a of the lengths of the three sides from the real-time shape information of the marking indentation;

[0047] e. Since the thermal expansion rate of niobium 521 alloy is very small, the dimensional change caused by tempera...

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