Knoop hardness studies on anthracene single crystals

Vaidya, Nimisha; Joshi, Mayank; Shah, B. S.; Joshi, D. R.

doi:10.1007/bf02745099

Cited by 4 publications

(1 citation statement)

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“…Noteworthy assessments of different crystal hardness anisotropy measurements have been reported by Brookes [263], Sargent and Page [264]. Individual crystal anisotropy measurements and analyses have been obtained on many crystals, including the following ones: calcium fluoride [265]; calcium and sodium nitrate [266]; MgO [267]; LaB 6 [268]; energetic (explosives) [269]; anthracene [270]; rare earth garnets [271]; magnesium sulphate hepta-hydrate [272]; gamma-TiAl [273]; and, a nickel base superalloy [274]. A result from the latter reference is shown in the square-framed spherically-modified indentation of Fig.…”

Section: Crystal Hardness and Plastic Anisotropymentioning

confidence: 99%

Elastic, Plastic, Cracking Aspects of the Hardness of Materials

Armstrong

Elban

Walley

2013

Int. J. Mod. Phys. B

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The hardness properties of materials are tracked from early history until the present time. Emphasis is placed on the hardness test being a useful probe for determining the local elastic, plastic and cracking properties of single crystal, polycrystalline, polyphase or amorphous materials. Beginning from connection made between individual hardness pressure measurements and the conventional stress–strain properties of polycrystalline materials, the newer consideration is described of directly specifying a hardness-type stress–strain relationship based on a continuous loading curve, particularly, as obtained with a spherical indenter. Such effort has received impetus from order-of-magnitude improvements in load and displacement measuring capabilities that are demonstrated for nanoindentation testing. Details of metrology assessments involved in various types of hardness tests are reviewed. A compilation of measurements is presented for the separate aspects of Hertzian elastic, dislocation-mechanics-based plasticity and indentation-fracture-mechanics-based cracking behaviors of materials, including elastic and plastic deformation rate effects. A number of test applications are reviewed, most notably involving the hardness of thin film materials and coatings.

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Section: Crystal Hardness and Plastic Anisotropymentioning

confidence: 99%

Elastic, Plastic, Cracking Aspects of the Hardness of Materials

Armstrong

Elban

Walley

2013

Int. J. Mod. Phys. B

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Microhardness studies on nonlinear optical L-alanine single crystals

Hanumantharao

Kalainathan

2013

Bull Mater Sci

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Vickers and Knoop microhardness tests were carried out on grown L-alanine single crystals by slow evaporation technique over a load range of 10-50 g on selected broad (2 0 3) plane. Vickers (H v) and Knoop (H k) microhardness for the above loads were found to be in the range of 60-71 kg/mm 2 and 35-47 kg/mm 2 , respectively. Vickers microhardness number (H v) and Knoop microhardness number (H k) were found to increase with increasing load. Meyer's index number (n) calculated from H v shows that the material belongs to the soft material category. Using Wooster's empirical relation, the elastic stiffness constant (c 11) was calculated from Vickers hardness values. Young's modulus was calculated using Knoop hardness values. Hardness anisotropy has been observed in accordance with the orientation of the crystal.

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