Dynamic Strength of Iron at High Pressures and Strain Rates

Accurate modeling of meteorite impacts, and deformation of planetary cores require characterization of the flow strength and in-elasticity of iron in its different phases. In this Letter, we investigate the flow strength of both the ambient α phase and high-pressure ε phase of iron at strain rates o...

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Bibliographic Details
Published in:Physical review letters 2022-01, Vol.128 (1), p.015705-015705, Article 015705
Main Authors: Gandhi, Vatsa, Ravindran, Suraj, Ravichandran, Guruswami
Format: Article
Language:English
Subjects:
Compressive strength
Equations of state
High strain-rate tests
Impact test
MATERIALS SCIENCE
Phase transitions
Plasticity
Shear deformation
Shock waves
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Summary:Accurate modeling of meteorite impacts, and deformation of planetary cores require characterization of the flow strength and in-elasticity of iron in its different phases. In this Letter, we investigate the flow strength of both the ambient α phase and high-pressure ε phase of iron at strain rates of 1×10^{5}  s^{-1} and pressures up to 42 GPa using high-pressure-pressure shear plate impact experiments. We report the strength of the ε iron to be significantly higher than α phase but consequently one order smaller than the previously reported dynamic strength at high pressures. The complete stress-strain response of the ε phase is reported for the first time.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.128.015705