What question did this study set out to answer?

To explore the alpha to epsilon phase transition in iron under rapid strain rates using x-ray diffraction.

March 1, 20260 citationsOpen Access

In situ x-ray diffraction of the α − ɛ phase transition in iron at intermediate strain rates

MTMinxue TangDeutsches Elektronen-Synchrotron DESY RHRachel J. HusbandDeutsches Elektronen-Synchrotron DESY ZKZuzana KonôpkováEuropean X-Ray Free-Electron Laser

Puntos clave

To explore the alpha to epsilon phase transition in iron under rapid strain rates using x-ray diffraction.
Utilized dynamic diamond anvil cells driven by piezoelectric actuators.
Collected x-ray diffraction data at megahertz repetition rates.
Examined powder and foil samples under fast quasihydrostatic compression.
Majority of alpha phase transforms to epsilon phase within tens of microseconds.
Coexistence pressure observed at approximately 2 GPa during the transition.
Onset phase transition pressure ranged from 13.4 to 14.4 GPa, consistent with previous studies.

Resumen

The 𝛼(bcc)-ɛ(hcp) phase transition in polycrystalline Fe has been investigated under fast quasihydrostatic compression using piezoelectric actuator driven dynamic diamond anvil cells. X-ray diffraction data from Fe under intermediate strain rate compression were collected at megahertz repetition rates. Our results demonstrate, for the first time, the full evolution of the 𝛼−ɛphase transition in powder and foil samples at strain rates of ∼102s−1. Under fast compression, the majority of the 𝛼phase transforms to ɛ-Fe in a timescale of tens of microseconds, with a corresponding coexistence pressure of ∼2GPa. The observed onset phase transition pressure of 13.4–14.4 GPa is in good agreement with the results of previous quasihydrostatic compression studies, suggesting that the transition is not influenced by compression rates up to ∼80TPas−1.

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