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High-pressure phase transition of mullite under shock compression
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Image of FIG. 1.
FIG. 1.

Target schematic. The DLI laser beam is Doppler shifted by the movement of the sample surface. An interferometer produces a fringe shift corresponding to the free-surface velocity.

Image of FIG. 2.
FIG. 2.

Streak image of the shock compression experiment of mullite. 1: arrival time of elastic wave at the front surface of the specimen, 2: change of fringes due to the arrival of the elastic wave at the rear surface of the specimen, 3: change of fringes due to the arrival of the phase transition wave, 4: change of fringes due to the arrival of the final wave. Image size is .

Image of FIG. 3.
FIG. 3.

Shock velocity versus particle velocity Hugoniot data of mullite. The average and have been and at the HEL, and and at the phase transition point, respectively. and are longitudinal velocity and bulk sound velocity, respectively. They are calculated from the elastic constants (Ref. 15).

Image of FIG. 4.
FIG. 4.

Mullite Hugoniot data along with calculated Hugoniots for untransformed mullite (mullite hydrostat Hugoniot) and for the high-pressure assemblage (models 1, 2, and 3). All calculated Hugoniots are assumed to be hydrostatic pressures. The average HEL stress and phase transition pressure were and , respectively. Initial volume, HEL and phase transition are connected with a dotted curve. The portions of Hugoniot from initial volume to HEL and from HEL to phase transition point are longitudinal elastic regime and plastic regime, respectively.


Generic image for table
Table I.

Shock velocity, particle velocity, pressure, density (km/s, km/s, GPa, ).

Generic image for table
Table II.

Parameters of mullite, corundum, stishovite, and high-pressure assemblage used in this study.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High-pressure phase transition of mullite under shock compression