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Deformation and microhardness studies on natural apophyllite crystals
Author(s) -
Dhar Prithvi Raj,
Bamzai Krishen,
Kotru P. N.
Publication year - 1997
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170320407
Subject(s) - indentation hardness , anisotropy , materials science , composite material , penetration (warfare) , deformation (meteorology) , mineralogy , microstructure , mathematics , optics , chemistry , physics , operations research
Microhardness testing of three different planes of natural apophyllite crystals is reported. Variation of Vicker's microhardness value H v with applied load ranging from 10–100 g indicates two distinct regions. In the low load region (10–70 g) H v increases with load till it attains maximum value and then decreases thereafter. This variation is explained qualitatively in terms of depth of penetration of the indentor. Variation of orientation of the indentor w.r.t. each of the (100) and (111) planes indicates microhardness anisotropy.