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Quantitative Hardness Measurement by Instrumented AFM-indentation

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Effect of Loading Rate Upon Conventional Ceramic Microindentation Hardness.

George D Quinn¹, Parimal J Patel², Isabel Lloyd³

¹National Institute of Standards and Technology, Gaithersburg, MD 20899-8521.

Journal of Research of the National Institute of Standards and Technology

|July 23, 2016

Summary

Loading rate has negligible impact on Vickers hardness for ceramics and steel, even when varied significantly. This finding addresses uncertainty in international standards for ceramic hardness testing.

Keywords:

aluminum oxynitride hardness loading rate silicon carbide

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Area of Science:

Materials Science
Mechanical Engineering
Ceramics Engineering

Background:

International standards for ceramic hardness testing present inconsistent requirements for indentation loading rates.
Existing literature suggests a potential influence of loading rate on measured hardness values, creating uncertainty.

Purpose of the Study:

To investigate the effect of indentation loading rate on measured Vickers hardness.
To provide experimental data to resolve discrepancies regarding loading rate effects in ceramic hardness testing.

Main Methods:

Experimental indentation tests were conducted on steel, sintered silicon carbide, and aluminum oxynitride.
Loading rates were systematically varied across approximately four orders of magnitude, from 0.03 N/s to 10 N/s.

Main Results:

Vickers hardness measurements showed negligible variation across the tested range of loading rates.
The observed effect of loading rate on hardness was insignificant for all tested materials.

Conclusions:

Indentation loading rate does not significantly affect Vickers hardness measurements in steel, sintered silicon carbide, and aluminum oxynitride.
Experimental results suggest that current variations in loading rate control within international standards may not critically impact hardness results.