Publisher's Note: Collective nature of plasticity in mediating phase transformation under shock compression [Phys. Rev. B89, 220101(R) (2014)]

Isothermal annealing of shocked zirconium: Stability of the two-phase α/ω microstructure

“…Figure 7d confirms the lath like α grains exhibit an (0 0 0 1) α (1 0 1 1) ω and [1 0 1 0] α [1 1 2 3] ω orientation relationship with the equiaxed parent ω, as reported in previous studies on shocked Zr [21]. That this relationship is not observed in the circled grains in Figure 7b supports that they are untransformed remnants of the original structure and provides further evidence for the hypothesis that, during the shock, nearly all of the initial α microstructure is transformed to ω and that majority of the observed α grains post-shock are children of the ω structure [39].…”

“…Despite having similar initial dislocation densities in the ω phase for both shock pressures, the transformation rates and extent of transformation for different shock pressures were different. The most likely explanation is that the dislocation state of both samples are significantly different, thus requiring affirmation in a future study to deter-mine the type and nature of dislocations present and their likely precursors in the pre-transformed α. VISAR (Velocity Interferometer System for Any Reflector) analysis of the data from the shock experiments suggests that while both samples were above the transformation pressure for the same amount of time (≈ 0.7µs) [39], the 8 GPa sample took almost this entire time to complete the forward transformation while the 10.5 GPa sample completed the forward transformation in ≈ 0.1µs. Due to the more rapid nature of the shock transformation in the 10.5 GPa sample, the dislocations in the original α microstructure may have been "caught" in the transformation and become sessile in the ω phase (stuck on planes with limited mobility).…”

Interactions between coherent twin boundaries and phase transition of iron under dynamic loading and unloading

“…[33] observed a 90˚ reorientation of α-Ti before transformation into ω phase under shock compressions by NEMD simulations. The reorientation cannot be attributed to any known twinning modes of HCP metals, but a new deformation mode in extreme conditions, whose formation is accommodated by collective action of dislocations and deformation twins [34]. They further found that it is the reorientation, in contrast to the shear-coupled GB migration mechanism, that contributes to migrations of tilted 90˚ GB of Ti bicrystals under uniaxial stresses normal to the GB [32].…”

“…However, the roles of CTBs played in the phase transition of iron are still not clear. Most recently, researches on CTB and phase transition in Ti has brought out some new insights into deformation mechanisms, as well as its interactions with phase transition, under shock or uniaxial compressions [31][32][33][34][35]. Zong et.…”

A molecular dynamics study of the role of grain size and orientation on compression of nanocrystalline Cu during shock

“…Over the last decade, MD simulations and experimental studies have been performed to explore solid-solid phase transformations in single crystals [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. For example, Kadau et al [24] identified the role of shockwave strength on structural transformations in Ga single crystals.…”