C1326 is up for its 5 year review, and we can take this opportunity to make some adjustments to keep it in accord with related standard, E 384, which formerly was known as Test Method for Microhardness of Materials. When C 1326 was written specifically for ceramics in the early 1990s, we coupled our standard to E 384 for the essentials, but included changes that were relevant to advanced ceramics. For example, C1326 had requirements on how close the indents could be to each other, how to deal with cracking, what forces to use, how to use cross hairs properly, mention of the NIST ceramic SRM, and precision and bias results from a round robin that we coordinated at NIST. Most importantly, C1326 included new requirements on the numerical aperture of the objective lenses. C1326 also specified that the outcomes be reported in modern SI units of GPa. E 384 has been drastically revised in the last few years. and it is now called E 384-11, Standard Test Method for Knoop and Vickers Hardness of Materials (2011). The proposed revisions to C1326 update it and bring it into consistency with E 384 as appropriate.
advanced ceramics; indentation; Knoop hardness; microscope; Advanced ceramics; Hardness (indentation); Knoop hardness (HK) number; Microscopic examination--advanced ceramics; Optical microscopy;
Citing ASTM Standards
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