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首页> 外文期刊>Physical review letters >Triaxial-Stress-Induced Homogeneous Hysteresis-Free First-Order Phase Transformations with Stable Intermediate Phases
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Triaxial-Stress-Induced Homogeneous Hysteresis-Free First-Order Phase Transformations with Stable Intermediate Phases

机译：具有稳定中间相的三轴应力诱导的均质无滞后一阶相变

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摘要

Starting with thermodynamic predictions and following with molecular dynamics simulations, special triaxial compression-tension states were found for which the stresses for the instability of the crystal lattice of silicon (Si) are the same for direct and reverse phase transformations (PTs) between semiconducting Si I and metallic Si II phases. This leads to unique homogeneous and hysteresis-free first-order PTs, for which each intermediate crystal lattice along the transformation path is in indifferent thermodynamic equilibrium and can be arrested and studied by fixing the strain in one direction. By approaching these stress states, a traditional two-phase system continuously transforms to homogenous intermediate phases. Zero hysteresis and homogeneous transformations are the optimal property for various PT applications, which drastically reduce damage and energy dissipation.
机译：从热力学预测开始，然后进行分子动力学模拟，发现了特殊的三轴压缩-拉伸状态，在这种状态下，硅（Si）的晶格失稳的应力对于半导体Si之间的正相和逆相变（PTs）相同。 I和金属Si II相。这导致了独特的均匀且无滞后的一阶PT，对于这些PT，沿转换路径的每个中间晶格处于无差异的热力学平衡状态，并且可以通过将应变固定在一个方向上来进行捕获和研究。通过接近这些应力状态，传统的两相系统会连续转换为均匀的中间相。零磁滞和均匀变换是各种PT应用的最佳性能，可大大减少损坏和能量消耗。

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  • 来源
    《Physical review letters》 |2017年第2期|025701.1-025701.5|共5页
  • 作者

    Levitas Valery I.; Chen Hao; Xiong Liming;

  • 作者单位

    Iowa State Univ, Dept Aerosp Engn, Ames, IA 50011 USA|Iowa State Univ, Dept Mech Engn, Ames, IA 50011 USA|Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA|Ames Lab, Div Mat Sci & Engn, Ames, IA 50011 USA;

    Iowa State Univ, Dept Aerosp Engn, Ames, IA 50011 USA;

    Iowa State Univ, Dept Aerosp Engn, Ames, IA 50011 USA;

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