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

机译:在180GPA的180 GPA中将冲击压缩铜转化为身体中心立方结构

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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 ~180 GPa. Additionally, stacking fault (SF) abundance in shock-compressed copper increases with compression, reaching ~ 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 fee-bee 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.
机译:在冲击压缩铜中使用原位X射线衍射测量(38-276GPa)。我们表明,环境面朝立方(FCC)结构在〜180GPa上变换到正方形立方(BCC)结构。此外,堆叠故障(SF)在冲击压缩铜中的丰度随压缩而增加,在FCC-BCC相转变的开始时达到〜10%。两个发现都是符合最新结果的震动压缩金和银,显示SFS在促进收费蜂转化方面的重要性。与我们的结果相比,铜最近据报道,在斜坡压缩下将FCC结构保留到超过1000GPa [fratanduono等,phy。 rev. lett。 124,015701(2020)]。需要进一步的研究来理解为什么在冲击压缩下观察到铜中的FCC-BCC转换,但不在斜坡压缩下。

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  • 来源
    《Physical review》 |2020年第2期|020103.1-020103.6|共6页
  • 作者单位

    Institute for Shock Physics Washington State University Pullman Washington 99164 USA;

    Institute for Shock Physics Washington State University Pullman Washington 99164 USA;

    Institute for Shock Physics Washington State University Pullman Washington 99164 USA;

    Institute for Shock Physics Washington State University Pullman Washington 99164 USA Department of Physics and Astronomy Washington State University Pullman Washington 99164 USA;

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