Dauphiné twinning and texture memory in polycrystalline quartz. Part 3: texture memory during phase transformation
نویسندگان
چکیده
منابع مشابه
Dauphiné twinning and texture memory in polycrystalline quartz. Part 3: texture memory during phase transformation
Samples of quartz-bearing rocks were heated above the a (trigonal)–b (hexagonal) phase transformation of quartz (625–950 C) to explore changes in preferred orientation patterns. Textures were measured both in situ and ex situ with neutron, synchrotron X-ray and electron backscatter diffraction. The trigonal–hexagonal phase transformation does not change the orientation of cand a-axes, but posit...
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Mechanical Dauphiné twinning in quartz has been of long-standing interest, both in single crystals and polycrystalline aggregates. This study investigates texture development in fine-grained quartz rock novaculite with no initial texture using compression experiments conducted in the Paterson gas apparatus to explore the influence of stress and temperature. Texture patterns are measured with ti...
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A recently developed crystal based continuum model for twinning and phase transformations is successfully applied to Dauphiné twinning and the α (trigonal) ↔ β (hexagonal) phase transformation in quartz. Both finite element and uniform deformation simulations are performed of quartz polycrystals and several experimentally observed phenomena are qualitatively reproduced. Results are given for me...
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ژورنال
عنوان ژورنال: Physics and Chemistry of Minerals
سال: 2009
ISSN: 0342-1791,1432-2021
DOI: 10.1007/s00269-009-0302-6