Microhardness

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microhardness [¦mī·krō′härd·nəs]

(metallurgy)

Hardness of microscopic areas of a metal or alloy.

Microhardness

the hardness of individual segments of the microstructure of a material.

The microhardness is measured by pressing with a diamond pyramid under a load of less than 2 newtons (200 grams-force). The size of the mark produced is measured under a microscope, and the hardness number—the ratio of the applied pressure to the surface area of the mark—is calculated using special tables. The instrument for determining microhardness permits selection of a particular segment of the microstructure onto which the diamond will be pressed. Such selection, as well as the small size of the marks produced, makes possible measurement of the microhardness of crystals of individual phases or various segments of a grain.

Data on microhardness are used in studying plastic deformations and the nonuniformity of distribution of dissolved impurities along the grain, as well as for plotting phase equilibrium diagrams.

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No references found			Fakirov, Microhardness of Polymers, Cambridge University Press, Cambridge, 251 (2007). Monitoring epoxy and unsaturated polyester reactions under ... by Cruz, Javier C.; Osswald, Tim A. / Polymer Engineering and Science The microhardness of the as-sprayed Ti coating was slightly higher compared to pure Ti bulk, owing to the work hardening effect during deposition. Effect of heat treatment on microstructure and mechanical properties ... by Li, W.-Y.; Zhang, C.; Liao, H.; Coddet, C. / JCT Research Operating more than 55 CNC machine tools, some capable of holding micron-level tolerances, Xceldyne also uses numerous optical and laser-scanning systems, CMMs, roundness gaging, profilometer, surface-finish, microhardness, hardness, and other QC instruments for optimal tolerance testing. Shops Upgrade Drag-Racer Production by Bruce Morey / Manufacturing Engineering			microfossil microgamete microgametocyte microgametophyte microgammil microgamy microgastria microgenesis microgenitalism microgeography Microglia microglossia micrognathia MicroGnuEmacs Micrografx Micrografx Graphics Suite microgram micrograph micrographic micrographics microgravity microgroove record microgyria microhabitat microhand Microhardness microheterogeneity microhm microholography Microhoo Microhylidae Microhyliidae microhysteresis effect microimage microincineration microinfarct microinjection microinstruction Microinterferometer microinvasion microirradiation microjacket microJava microkernel microlaser microlaterolog microlayer microLCD microLenat microlens array microlensing			Microgravity Science and Applications Microgravity Science and Applications Cooperative Program Microgravity Science and Applications Division Microgravity Science Division Microgravity Science Glovebox Microgravity Science Laboratory Microgray Microgreen Microgreen Microgreens Microgreens Microgroove Microgroove record Microgroove record microgrooves microgyri microgyria microgyria Microgyrus Microgyrus microhabitat microhabitat microhabitat microhabitat microhabitat microhabitats microhabitats microhabitats Microhaematocrit Buffy-Coat Microscopy microhand Microhardness Microheater Array Boiling Experiment Microhedge Microhedges microhemagglutination assay–Treponema pallidum microhemagglutination assay–Treponema pallidum microhemagglutination assay–Treponema pallidum microhemagglutination assay–Treponema pallidum microhemagglutination assay–Treponema pallidum Microhematocrit Microhematocrit Microhematocrit Microhematuria microhepatia Microhertz Microhertz Microhertz microheterogeneity Microhierax Microhierax Microhm Microhm Microhm microholography Microhomology-Mediated End Joining Microhoo Microhydranencephaly Microhylid Microhylid Microhylidae Microhylidae

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