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首页> 外文期刊>Physical review >In situ x-ray diffraction of fast compressed iron: Analysis of strains and stress under non-hydrostatic pressure
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In situ x-ray diffraction of fast compressed iron: Analysis of strains and stress under non-hydrostatic pressure

机译：快速压缩铁的原位X射线衍射：非静水压力下的应变和应力分析

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摘要

Series of high-pressure x-ray diffraction patterns of iron and its high-pressure polymorphs were collected with 0.1-0.2-s exposure time utilizing a membrane diamond anvil cell (DAC) for compression at various loading and unloading rates to a maximum pressure of 70 GPa. Strain rates of 10~(-2) s~(-1) at a maximum pressurization rate of 4.1 GPa/s were achieved in non-hydrostatic compression of hcp Fe. Linewidth analysis was used to retrieve strain and uniaxial stress of Fe as a function of pressure upon both compression and decompression. Analysis of the lattice parameters ratio c/a of hcp Fe indicates the presence of complex non-hydrostatic stress states, which developed as a function of strain rate, relaxation time, and various levels of hydrostaticity. Our results emphasize the importance of a controlled pressurization in DACs because the experimental loading rate strongly influences the stress state of the sample, particularly on decompression. Our time-resolved x-ray diffraction of the phase transition from bcc Fe to hcp Fe reveals residual grains of bcc Fe capable of surviving to very high pressures (＞35 GPa) for a few minutes after the transition.
机译：铁和其高压多晶型物的一系列高压x射线衍射图以0.1-0.2-s的曝光时间收集，采用膜金刚石砧盒（DAC）在各种加载和卸载速率下压缩至最大压力为70 GPa。在hcp Fe的非静水压缩过程中，最大加压速率为4.1 GPa / s时，应变率为10〜（-2）s〜（-1）。线宽分析用于获取铁的应变和单轴应力，作为压缩和减压时压力的函数。对hcp Fe的晶格参数比率c / a的分析表明存在复杂的非静水应力状态，该状态是应变速率，弛豫时间和各种静水压力的函数。我们的结果强调了DAC中受控加压的重要性，因为实验加载速率会强烈影响样品的应力状态，尤其是在减压方面。我们从bcc Fe到hcp Fe的相变的时间分辨X射线衍射揭示了bcc Fe的残留晶粒能够在过渡后的几分钟内存活到非常高的压力（> 35 GPa）。

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  • 来源
    《Physical review》 |2015年第14期|144101.1-144101.8|共8页
  • 作者

    Zuzana Konopkova; Andre Rothkirch; Anil K. Singh; Sergio Speziale; Hanns-Peter Liermann;

  • 作者单位

    DESY Photon Science, Notkestrasse 85, D-22602, Hamburg, Germany;

    DESY Photon Science, Notkestrasse 85, D-22602, Hamburg, Germany;

    Materials Science Division, National Aerospace Laboratories, Council of Scientific and Industrial Research, Bangalore, India;

    GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany;

    DESY Photon Science, Notkestrasse 85, D-22602, Hamburg, Germany;

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  • 正文语种 eng
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  • 关键词

    high-pressure behavior;

    机译：高压行为;

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