This contains figures and reduced data from the study. Single crystals of ferromagnesian olivine (San Carlos, AZ, peridot, ~Fo88-90) have been deformed in both uniaxial creep and load relaxation under conditions of ambient pressure, T = 1500ºC and inline image=10-10 atm, creep stresses were in the range 40 ≦ 220. The crystals were oriented such that the applied stress was parallel to [011]c, which promotes single slip on the slowest slip system in olivine (101)[001]. The creep rates at steady state match well the results of earlier investigators, as does the stress sensitivity (a power-law exponent of n = 3.6). Dislocation microstrucures, including spatial distribution of low-angle (subgrain) boundaries additionally confirm previous investigations. Inverted primary creep (an accelerating strain rate with an increase in stress) was observed. Load-relaxation, however, produced a singular response--a single hardness curve--regardless of the magnitude of creep stress or total accumulated strain preceding relaxation. The log-stress v. log-strain rate data from load relaxation and creep experiments overlap to within experimental error. The load-relaxation behavior is distinctly different than that described for other crystalline solids, where the flow stress is affected strongly by work hardening such that a family of distinct hardness curves is generated, which are related y a scaling function. The response of olivine for the conditions studies, we argue, indicates flow that is rate-limited by dislocation glide, reflecting specifically a higher intrinsic lattice resistance (Peierls stress)
Notes:
This work was supported, in part, by the National Science Foundation, Earth Sciences Division Program in Geophysics through Grant EAR1014476 (to RFC)
This work is licensed under a Creative Commons Attribution4.0 International License
Citation
Cooper, Reid F., Stone, Donald S., and Plookphol, Thawatchai,
"Data for 'Load relaxation of olivine single crystals'"
(2016).
Brown University Open Data Collection.
Brown Digital Repository. Brown University Library.
https://doi.org/10.7301/Z0TM782K
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