Transformation of shock-compressed copper to the body-centered-cubic structure at 180 GPa

Article

关键词: EQUATION-OF-STATE;    PHASE-TRANSITION;    STACKING;    PRESSURE;    ALUMINUM;    METALS;    CU;    MECHANISM;    MO;   

DOI  :  10.1103/PhysRevB.102.020103

来源: SCIE

【 摘 要 】

Using in situ x-ray diffraction measurements in shock-compressed copper (38-276 GPa), we show that the ambient face-centered-cubic (fcc) structure transforms to the body-centered-cubic (bcc) structure at similar to 180 GPa. Additionally, stacking fault (SF) abundance in shock-compressed copper increases with compression, reaching similar to 10% at the onset of the fcc-bcc phase transition. Both findings are consistent with recent results on shock-compressed gold and silver that showed the importance of SFs in facilitating the fcc-bcc transformation. In contrast to our results, copper was recently reported to retain the fcc structure to over 1000 GPa under ramp compression [Fratanduono et al., Phys. Rev. Lett. 124. 015701 (2020)]. Further studies are needed to understand why the fcc-bcc transformation in copper is observed under shock compression, but not under ramp compression.

【 授权许可】

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