Understanding Precipitate Growth Kinetics at Ultra High Hydrostatic Pressures

In this work, we have studied the precipitate growth behavior of a metal matrix when subjected to hydrostatic pressure. We utilized Zenner-Frank phase field kinetics with integrated free energy density functional based on volumetric strain energy. We studied the precipitate growth up to 2 GPa under varying bulk modulus of the precipitate phase. We observed that subjecting to hydrostatic pressure influences the growth kinetics by reducing the precipitate growth under time evolution. In addition, the bulk modulus of the precipitate has shown an abnormality in the growth behavior compared to general observations under hydrostatic pressure. This work contributes to the smart tailoring of novel materials to reduce detrimental impacts on holistic material properties, used in large hydrostatic pressure applications.

本研究针对受静水压力作用的金属基体中析出相的生长行为展开系统探究。本研究采用基于体积应变能的积分自由能密度泛函，结合泽纳-弗兰克（Zenner-Frank）相场动力学模型开展相关分析。我们针对析出相体积模量变化的多种工况，探究了最高2吉帕（GPa）静水压力下的析出相生长过程。研究发现，静水压力作用会通过抑制时间演化过程中的析出相生长，对生长动力学产生调控影响。此外，与静水压力下的常规观测结果相比，析出相的体积模量对其生长行为表现出异常调控效应。本研究可为大静水压力应用场景下的新型材料精准定制提供理论支撑，以削弱不利因素对材料整体性能的负面影响。