Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase Transitions in High Purity Zr Under Dynamic Compression   We present results from ramp compression experiments on high-purity Zr that
show the $\alpha \rightarrow \omega$, $\omega \rightarrow \beta$, as well as
reverse $\beta \rightarrow \omega$ phase transitions. Simulations with a
multi-phase equation of state and phenomenological kinetic model match the
experimental wave profiles well. While the dynamic $\alpha \rightarrow \omega$
transition occurs $\sim 9$ GPa above the equilibrium phase boundary, the
$\omega \rightarrow \beta$ transition occurs within 0.9~GPa of equilibrium. We
estimate that the dynamic compression path intersects the equilibrium $\omega -
\beta$ line at $P= 29.2$ GPa, and $T = 490$ K. The thermodynamic path in the
interior of the sample lies $\sim 100$ K above the isentrope at the point of
the $\omega \rightarrow \beta$ transition. Approximately half of this
dissipative temperature rise is due to plastic work, and half is due to the
non-equilibrium $\alpha \rightarrow \omega$ transition. The inferred rate of
the $\alpha \rightarrow \omega$ transition is several orders of magnitude
higher than that measured in dynamic diamond anvil cell (DDAC) experiments in
an overlapping pressure range. We discuss a model for the influence of shear
stress on the nucleation rate. The small fractional volume change $\Delta V/V
\approx 0.1$ at the $\alpha \rightarrow \omega$ transition amplifies the effect
of shear stress, and we estimate that for this case shear stress is equivalent
to a pressure increase in the range of several GPa. Correcting our transition
rate to a hydrostatic rate brings it approximately into line with the DDAC
results, suggesting that shear stress plays a significant role in the
transformation rate.

11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th