GB/T 21838.4-2020 Active National standards

GB/T 21838.4-2020 Metallic materials—Instrumented indentation test for hardness and materials parameters—Part 4:Test method for metallic and non-metallic coatings

Publish Date: 2020-12-14 Implement Date: 2021-07-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: GB/T 21838.4-2020

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: \n Test methods for the mechanical properties of metals

ICS Name: Mechanical testing of metal materials

Publish Date: 2020-12-14

Implement Date: 2021-07-01

Pages: 20 pages

Scope

This document specifies the instrumented indentation test method for the hardness and material parameters of metal and non-metallic coatings, which is particularly suitable for thin coating tests in the nano/micro range. If the indentation depth is so small relative to the coating thickness that the influence of the substrate material can be neglected and the coating can be treated as a bulk material in any possible case, there is no need to use this document. The test limitations in this case are given in this document.
This method is limited to single-layer coating tests on the surface of the specimen, but if the thickness or gradient of each layer relative to the indentation size is greater than the measurement resolution, the properties of gradient and multi-layer coating materials can also be measured on their cross-section.
This method does not limit the type of materials. It is suitable for metal and non-metallic coatings. In this document, the term "coating" is used to describe any solid layer that is different from the substrate and has uniform properties. The method assumes that the coating properties do not change with the indentation depth. For composite coating layers, if the microstructure size is smaller than the indentation size, the composite coating layers can be considered uniform.
This document is only applicable to the use of pyramidal or conical indenter heads with a sufficiently small top curvature radius to ensure that the plastic deformation generated by the measurement occurs within the coating. For viscoelastic or easily creep materials, the test time has a significant impact on their hardness measurement.
Note 1: ISO 14577-1, ISO 14577-2, and ISO 14577-3 specify the instrumented indentation test method for bulk materials in all force and displacement ranges.
Note 2: The analysis here does not consider indentation pile-up or sinking. Using atomic force microscopy (AFM) to evaluate the shape of the indentation