Phase transitions in Zr at sub-nanosecond time scales

Article Materials Science, Multidisciplinary

Observation of Fundamental Mechanisms in Compression-Induced Phase Transformations Using Ultrafast X-ray Diffraction

Michael R. Armstrong et al.

Summary: In Zr, a dynamically stabilized body-centered cubic (bcc) intermediate state was discovered under uniaxial loading at sub-nanosecond timescales instead of the expected transformation to the omega-Zr phase. Experiments and simulations highlighted the importance of metastability and time dependence in phase transformations, emphasizing the need to consider kinetics in addition to the phase diagram in material crystalline structure prediction.

JOM (2021)

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Article Physics, Applied

Time resolved x-ray diffraction in shock compressed systems

H. B. Radousky et al.

Summary: The availability of pulsed X rays on short timescales has opened up new avenues of research in the physics and chemistry of shocked materials, while theoretical advancements have increased the predictive capability of models. This paper discusses recent experimental results and developments in theory and modeling to address complex situations, as well as the potential impact of new platforms and increased beam time on the future direction of the field.

JOURNAL OF APPLIED PHYSICS (2021)

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Article Materials Science, Multidisciplinary

Bounds on the Rate-Dependent Plastic Flow of Tantalum up to 75 GPa

B. W. Reed et al.

Summary: This study focuses on the thermodynamics-based analysis of shock wave propagation to extract information on materials strength at high strain rates and pressures. Experiments on polycrystalline tantalum show that plastic flow mainly occurs during shock loading at peak stresses of 50 GPa and 75 GPa. The study also introduces a reverse-ballistics shot at 25 GPa to reveal pullback response with negligible interference from free-surface effects.

JOURNAL OF DYNAMIC BEHAVIOR OF MATERIALS (2021)

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Article Physics, Multidisciplinary