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8/3/2019 Lowell Miyagi et al- In-situ Phase Transformation and Deformation of Iron at High Pressure and Temperature
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Title:
In-situ Phase Transformation and
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In-situ Phase Transform
Lowell Miyagi1, Martin Kunz
2, Ja
1 Department of Earth and P
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intensity changes along Debye
compression direction (lattice
While previous work u
situ rheological behavior throu
limited to ambient temperatur
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laser heating). This developm
simultaneously at high-temper
Iron is a good candidat
as it has been well studied due
geophysics The pressure tem
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temperature in order to conver
phase (Figure 1 path A). This
loading system on a material t
second run we combine laser h
the bcc phase then convert it b
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during x-ray exposure in order
The gas-driven membrane is s
rDAC with the base plate mec
connected to a pressure reduce
Pressure change is achieved b
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In the first run (A) pre
increments taking in-situ diffr
which point the sample was fu
achieved the sample was incre
For the high-temperature defo
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distribution (m.r.d.), where 1 m
of a single crystal the m.r.d. v
III. Results and Discussion
III-I Room Temperature Defo
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proportion of the hcp phase (F
of the bcc phase (Table SM-I,
The pressure discrepan
partly due to the different equa
small It is known that the co
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equivalent description is the m
{1-12}⟨-111⟩ bcc.43
Indeed we d
have qualitatively similar text
as does the corresponding hcp
bcc phase and likewise the 00
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4, # A 69(α)). This will gener
the hcp phase (Figure 4 inset,
Additionally 110 bcc orientati
there are very few orientations
minimum at 0001 in the hcp p
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variant selection is not as pron
with {112} at high angle to th
transformation and this subset
III-III High Temperature Def
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phase fraction of the bcc phase
6c). At these conditions there
Figure 7). We also observe gr
containing the Pt, MgO and a
diffraction rings in these regio
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This texture does not change m
(Figure 7, # B 139(α)).
After transformation th
and 111. Transformation text
extensively studied51
The tex
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spreading to form a girdle arou
textures are in contrast to thos
room temperature measureme
In order to interpret the
turn to polycrystal plasticity m
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strains will cause the girdle 30
observed in room temperature
1-12}⟨2-1-13⟩ slip and basal (
to the experimental textures (F
the girdle offset 30° from 000
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sample during heating. It is li
insulation and more even heat
silicates as these samples have
insulate. Another approach th
to defocus the laser to provide
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variant selection plays an imp
from hcp Fe to bcc Fe at room
Acknowledgements:
The Advanced Light S
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Figure Captions
Figure 1: P-T phase diagram f
fcc structure, and the ε-phase
temperature run (A) and the hi
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Figure 6: “Unrolled” diffractio
b) just before laser heating, c)
GPa at 1800 K. During heatin
highly recrystallized region co
with compression to 30 GPa th
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Table and Caption
Table I: Critical resolved she
deformation modes for model
of the simulation and the end o
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Table SM-I: Experimental co
errors are given in parenthesis
is a measure of texture sharpn
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References
1R.J. Hemley, H-K. Mao, G. S
Science , 276, 316, 1242 (1997
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15
R.J. Hemley, H-K. Mao, Int
16 Y. Ma, M. Somayazulu, G.
Planet. Inter., 143-144, 455 (2
17G Poupinet R Pillet A So
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32W.A. Caldwell, M. Kunz, R
Walker, J. Glossinger, A.A. M Nuclear Instruments and Meth
33S. Merkel, T. Yagi, Review
34J Zhang F Guyot Physics
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51
R.K. Ray, J.J. Jonas, M.P. B
52 G. Kurdjumov, G. Sachs, Z
53H-R. Wenk, I. Huensche, L
261 (2007)
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