Plastic flow strength of jadeite and diopside investigated by microindentation hardness tests |
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| Authors: | Dorothe Dorner Bernhard Stckhert |
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| Institution: | aInstitute of Geology, Mineralogy and Geophysics, Ruhr-University Bochum, Universitatsstrasse 150, Bochum D-44780, Germany |
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| Abstract: | Microindentation hardness tests were performed on jadeite and diopside, being end members of the omphacite solid solution series. At temperatures between 300 and 750 °C, the hardness of jadeite ranges from 7.4 to 8.5 GPa, that of diopside from 4.9 to 6.1 GPa. Jadeite is significantly stronger than diopside in the low-temperature plasticity regime. Normalization of the hardness-derived yield stress with respect to the shear modulus considerably reduces the strength contrast. The normalized Peierls stress is identical for jadeite and diopside. This indicates that jadeite and diopside belong to the same isomechanical group. The hardness-derived yield stress for jadeite as well as for diopside is used to estimate flow law parameters for the low-temperature plasticity regime. |
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| Keywords: | Low-temperature plasticity Jadeite Diopside Indentation Hardness Clinopyroxene Isomechanical group Flow law |
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