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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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