1.1 Introduction to Instrumented Indentation Test:

The Instrumented Indentation Test (IIT) is a material property testing method based on the force-displacement curve during the contact between the indenter and the sample.

An indenter (such as a diamond Vickers indenter or a spherical indenter) is pressed into the material surface at a controlled rate using a loading system; simultaneously, the load (P) and indentation depth (h) data are recorded in real time; a complete P-h curve is obtained throughout the loading-hold-unloading process; by analyzing the characteristic sections of the curve, a series of mechanical parameters of the material can be obtained.

Compared with traditional hardness testers, the instrumented indentation test can not only provide a single indicator of "hardness," but also quantitatively evaluate various mechanical properties, such as tensile properties and fracture toughness.

1.2 Applied Standards:

International Standard ISO/TR 29381 Metallic materials - Measurement of mechanical properties by an instrumented indentation test - Indentation tensile properties

Korean Standard KSB 0950 Metallic materials - Instrumented indentation test - Indentation tensile properties

Chinese Standard GB/T 39635 Metallic materials - Instrumented indentation test - Determination of indentation tensile properties and residual stress.