Elastic-Plastic Deformation of KDP Crystals under Nanoindentation

Jing Peng; Liang Chi Zhang; Xin Chun Lu

doi:10.4028/www.scientific.net/MSF.773-774.705

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HomeMaterials Science ForumMaterials Science Forum Vols. 773-774Elastic-Plastic Deformation of KDP Crystals under...

Elastic-Plastic Deformation of KDP Crystals under Nanoindentation

Abstract:

This paper investigates the mechanical properties of potassium dihydrogen phosphate (KDP) crystals with the aid of nanoindentation using a conical diamond indenter. It was found that when unloading is after the first pop-in, the common method of obtaining elastic modulus from the unloading curve of nanoindentation is no longer applicable, because the unloading is inelastic. The study revealed that the pop-in could be due to dislocation nucleation and propagation, and that the first pop-in occurs under a stress below that of the major dislocation burst. Hence, the macroscopic yielding point, which is usually regarded as the onset of plasticity of a material, is nanoscopically not a critical point of the first dislocation in KDP. The study found that the elastic modulus of KDP indenting on its (001) plane is 52.8±3.8GPa. The hardness of the material is 1.89±0.05GPa.

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Periodical:

Materials Science Forum (Volumes 773-774)

Pages:

705-711

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.773-774.705

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Online since:

November 2013

Authors:

Jing Peng, Liang Chi Zhang, Xin Chun Lu

Keywords:

Dislocation, Elastic Modulus, KDP, Nanoindentation, Pop-In

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