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    ASTM E2546 - 15

    Standard Practice for Instrumented Indentation Testing

    Active Standard ASTM E2546 | Developed by Subcommittee: E28.06

    Book of Standards Volume: 03.01

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    Significance and Use

    5.1 IIT Instruments are used to quantitatively measure various mechanical properties of thin coatings and other volumes of material when other traditional methods of determining material properties cannot be used due to the size or condition of the sample. This practice will establish the basic requirements for those instruments. It is intended that IIT based test methods will be able to refer to this practice for the basic requirements for force and displacement accuracy, reproducibility, verification, reporting, etc., that are necessary for obtaining meaningful test results.

    5.2 IIT is not restricted to specific test forces, displacement ranges, or indenter types. This practice covers the requirements for a wide range of nano, micro, and macro (see ISO 14577-1) indentation testing applications. The various IIT instruments are required to adhere to the requirements of the practice within their specific design ranges.

    1. Scope

    1.1 This practice defines the basic steps of Instrumented Indentation Testing (IIT) and establishes the requirements, accuracies, and capabilities needed by an instrument to successfully perform the test and produce the data that can be used for the determination of indentation hardness and other material characteristics. IIT is a mechanical test that measures the response of a material to the imposed stress and strain of a shaped indenter by forcing the indenter into a material and monitoring the force on, and displacement of, the indenter as a function of time during the full loading-unloading test cycle.

    1.2 The operational features of an IIT instrument, as well as requirements for Instrument Verification (Annex A1), Standardized Reference Blocks (Annex A2) and Indenter Requirements (Annex A3) are defined. This practice is not intended to be a complete purchase specification for an IIT instrument.

    1.3 With the exception of the non-mandatory Appendix X4, this practice does not define the analysis necessary to determine material properties. That analysis is left for other test methods. Appendix X4 includes some basic analysis techniques to allow for the indirect performance verification of an IIT instrument by using test blocks.

    1.4 Zero point determination, instrument compliance determination and the indirect determination of an indenter’s area function are important parts of the IIT process. The practice defines the requirements for these items and includes non-mandatory appendixes to help the user define them.

    1.5 The use of deliberate lateral displacements is not included in this practice (that is, scratch testing).

    1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    E3 Guide for Preparation of Metallographic Specimens

    E74 Practices for Calibration and Verification for Force-Measuring Instruments

    E92 Test Methods for Vickers Hardness and Knoop Hardness of Metallic Materials

    E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods

    E384 Test Method for Microindentation Hardness of Materials

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

    E1875 Test Method for Dynamic Youngs Modulus, Shear Modulus, and Poissons Ratio by Sonic Resonance

    E1876 Test Method for Dynamic Youngs Modulus, Shear Modulus, and Poissons Ratio by Impulse Excitation of Vibration

    ISO Standards

    ISO 14577-1, -2, -3, -4 Metallic MaterialsInstrumented Indentation Tests for Hardness and Material Properties Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.

    American Bearing Manufacturers Association Standard

    ABMA/ISO 3290-1 Rolling Bearings- Balls-Part 1: Steel Metal Balls Available from American Bearing Manufacturers Association (ABMA), 2025 M Street, NW Suite 800 Washington, DC 20036, http://www.americanbearings.org.

    ICS Code

    ICS Number Code 19.100 (Non-destructive testing)

    UNSPSC Code

    UNSPSC Code 41114611(Hardness testers)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/E2546-15

    Citation Format

    ASTM E2546-15, Standard Practice for Instrumented Indentation Testing, ASTM International, West Conshohocken, PA, 2015, www.astm.org

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