动态压缩下锡的相变研究

C. Chauvin, F. Zucchini, David Palma de Barros
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引用次数: 0

摘要

我们提出对动态压缩下锡的多晶转变进行实验研究。长期以来,人们通过在环境条件下的通常速度测量来研究这些变化。在CEA Gramat,我们通过实验和理论手段提高了对这种相变的理解。实验速度测量早就表明,非平衡行为和动力学是相变材料动态压缩响应的重要组成部分。经验动力学模型在许多情况下可以再现实验速度分布,但不能清楚地确定过渡的性质。近二十年来,CEA Gramat操作了几种用于冲击加载的气枪和用于等熵压缩实验(ICE)的高脉冲功率(HPP)驱动器,最高可达几GPa。这些实验装置和相关的诊断(测速和温度测量以及x射线衍射实验)有助于以更严格的方式开始研究动态转变下的动力学。我们使用这些实验来检查各种压缩路径,并使用结果来改进我们的数值代码中包含的状态方程(EOS)模型。后者可用于从环境初始条件开始运行模拟,然后从各种非环境初始温度加载金属材料。这可以大大扩展我们的研究范围到以前未探索的热力学路径。我们提出了我们的气体枪实验预热装置和我们的HPP驱动器,并提出了我们在不同初始温度下的冲击载荷和等熵压缩的初步结果,以探索锡的相图。此外,我们提出了有希望的x射线衍射在激波下的测试设计,以帮助建立一个更依赖于成核和生长机制的物理动力学模型,这在我们的连续统水平代码中实现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study on phase transformation in Tin under dynamic compression
We propose to study experimentally the polymorphic transition of Tin under dynamic compression. These transformations have been investigated for a long time through usual velocity measurements under shock from ambient condition. At CEA Gramat we have improved our understanding of such phase transformations through both experimental and theoretical means. Experimental velocity measurements have long suggested that non equilibrium behavior and kinetics is an important part of the dynamic compression response of materials undergoing phase transformations. Empirical kinetic models can in many cases reproduce the experimental velocity profiles, but without clearly identifying the nature of the transition. For nearly two decades, the CEA Gramat operates several gas guns for shock loading and high pulsed power (HPP) drivers dedicated to Isentropic Compression Experiments (ICE) up to several GPa. These experimental devices and associated diagnostics (velocimetry and temperature measurements and x-ray diffraction experiments) help to begin to study kinetics under dynamic transition in a more rigorous manner. We have used these experiments to examine various compression paths and have used the results to improve equation of state (EOS) models incorporated in our numerical codes. The latter can be used to run simulations starting with ambient initial conditions, then load metallic materials from various non ambient initial temperatures. This can significantly extend the range of our studies into previously unexplored thermodynamic paths. We propose to describe our preheating devices for gas gun experiments and our HPP driver, and to present our preliminary results on shock loading and on isentropic compression at various initial temperatures, to explore the phase diagram of Tin. In addition, we present the design of promising testing on X-ray diffraction under shock to help to develop a more physical kinetic model relying on nucleation and growth mechanisms, which are implemented in our continuum level codes.
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