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Title: Plastic Deformation of Wadsleyite and Olivine at High-Pressure and High-Temperature using a Rotational Drickamer Apparatus (RDA)

Abstract

Large-strain plastic deformation experiments of wadsleyite and olivine were conducted using a rotational Drickamer apparatus (RDA) up to pressure and temperature conditions corresponding to the Earth's mantle transition zone. Sintered ring-shaped (Mg,Fe)2SiO4 wadsleyite and olivine samples were deformed at P not, vert, similar 16 GPa and T = 1600 and 1800 K, and P not, vert, similar 11 GPa and T = 1800 K, respectively, with equivalent strain rate of View the MathML source. In situ observations of deforming samples were carried out using the synchrotron radiation facility at Brookhaven National Laboratory, NSLS, X17B2. Stress was measured by X-ray diffraction at six different angles with respect to the compression axis. The stress estimated by X-ray diffraction was in good agreement with the stress estimated from dislocation density (for olivine). Strain was determined using X-ray radiographs of a strain marker (Re or Mo foil). Deformation of samples with a RDA involves both uniaxial compression and simple shear. A new formulation is developed to analyze both components to determine the rheological properties of a sample. Stress-strain curves show strain-hardening up to the equivalent strain of var epsilonE not, vert, similar 0.2 followed by the quasi-steady state deformation. Wadsleyite is found to bemore » stronger than olivine compared at similar conditions and the creep strength of olivine at P not, vert, similar 11 GPa is much higher than those at lower pressures.« less

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
980391
Report Number(s):
BNL-93309-2010-JA
Journal ID: ISSN 0031-9201; PEPIAM; TRN: US1005487
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
Physics of the Earth and Planetary Interiors
Additional Journal Information:
Journal Volume: 170; Journal ID: ISSN 0031-9201
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BNL; COMPRESSION; CREEP; DEFORMATION; DENSITY; DIAGRAMS; DISLOCATIONS; EQUIPMENT; IMAGES; NSLS; OLIVINE; PLASTICS; PRESSURE RANGE MEGA PA 10-100; SHEAR; STRAIN HARDENING; STRAIN RATE; STRAINS; SYNCHROTRON RADIATION; TEMPERATURE RANGE 0400-1000 K; X-RAY DIFFRACTION; national synchrotron light source

Citation Formats

Nishihara, Y., Tiner, D, Kawazoe, T, Xu, Y, Jing, Z, Matsukage, K, and Karato, S. Plastic Deformation of Wadsleyite and Olivine at High-Pressure and High-Temperature using a Rotational Drickamer Apparatus (RDA). United States: N. p., 2008. Web. doi:10.1016/j.pepi.2008.03.003.
Nishihara, Y., Tiner, D, Kawazoe, T, Xu, Y, Jing, Z, Matsukage, K, & Karato, S. Plastic Deformation of Wadsleyite and Olivine at High-Pressure and High-Temperature using a Rotational Drickamer Apparatus (RDA). United States. doi:10.1016/j.pepi.2008.03.003.
Nishihara, Y., Tiner, D, Kawazoe, T, Xu, Y, Jing, Z, Matsukage, K, and Karato, S. Tue . "Plastic Deformation of Wadsleyite and Olivine at High-Pressure and High-Temperature using a Rotational Drickamer Apparatus (RDA)". United States. doi:10.1016/j.pepi.2008.03.003.
@article{osti_980391,
title = {Plastic Deformation of Wadsleyite and Olivine at High-Pressure and High-Temperature using a Rotational Drickamer Apparatus (RDA)},
author = {Nishihara, Y. and Tiner, D and Kawazoe, T and Xu, Y and Jing, Z and Matsukage, K and Karato, S},
abstractNote = {Large-strain plastic deformation experiments of wadsleyite and olivine were conducted using a rotational Drickamer apparatus (RDA) up to pressure and temperature conditions corresponding to the Earth's mantle transition zone. Sintered ring-shaped (Mg,Fe)2SiO4 wadsleyite and olivine samples were deformed at P not, vert, similar 16 GPa and T = 1600 and 1800 K, and P not, vert, similar 11 GPa and T = 1800 K, respectively, with equivalent strain rate of View the MathML source. In situ observations of deforming samples were carried out using the synchrotron radiation facility at Brookhaven National Laboratory, NSLS, X17B2. Stress was measured by X-ray diffraction at six different angles with respect to the compression axis. The stress estimated by X-ray diffraction was in good agreement with the stress estimated from dislocation density (for olivine). Strain was determined using X-ray radiographs of a strain marker (Re or Mo foil). Deformation of samples with a RDA involves both uniaxial compression and simple shear. A new formulation is developed to analyze both components to determine the rheological properties of a sample. Stress-strain curves show strain-hardening up to the equivalent strain of var epsilonE not, vert, similar 0.2 followed by the quasi-steady state deformation. Wadsleyite is found to be stronger than olivine compared at similar conditions and the creep strength of olivine at P not, vert, similar 11 GPa is much higher than those at lower pressures.},
doi = {10.1016/j.pepi.2008.03.003},
journal = {Physics of the Earth and Planetary Interiors},
issn = {0031-9201},
number = ,
volume = 170,
place = {United States},
year = {2008},
month = {1}
}