Journal
PHYSICAL REVIEW B
Volume 78, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.220101
Keywords
grain size; high-pressure effects; iron; molecular dynamics method; nanostructured materials; shock wave effects; X-ray diffraction
Funding
- U. S. Department of Energy [DE-AC52-07NA27344]
- LDRD [06-SI-004 at LLNL]
- DOE [DEFG0398DP00212, DEFG0300SF2202]
- U. K. EPSRC [GR/R25699/01]
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We discuss the grain-size measurements made during shock compression using in situ x-ray diffraction. Our experiments have shown unambiguously that single-crystal iron shock loaded above 13 GPa along the [100] direction will transform from the ambient alpha phase (bcc) to a highly ordered polycrystalline epsilon phase (hcp). Here, we present a detailed shape analysis of the diffraction peaks using a modified Warren-Averbach method to quantify the microstructure of shock-compressed high-pressure iron. The epsilon phase was determined through this method to have grain sizes between 2 and 15 nm, in reasonable agreement with results from large-scale molecular-dynamics simulations. We conclude that single-crystal iron becomes nanocrystalline in shock transforming from alpha to epsilon phase.
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