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在钻石细胞内进行光学全场应变测量

Robin Fréville¹, Nicolas Bruzy¹, Agnès Dewaele¹

¹CEA, DAM, DIF, F-91297 Arpajon, France and Université Paris-Saclay, CEA, Laboratoire Matière en Conditions Extrêmes, F-91680 Bruyères-le-Châtel, France.

The Review of scientific instruments

|December 20, 2023

概括

数字图像相关性 (DIC) 精确测量了铁.

科学领域:

材料科学材料科学材料科学
地质物理学地质物理学
固态物理固态物理

背景情况:

在高压下铁的相变化对于理解地球深层内部至关重要.
之前研究这些转变的方法在应变测量方面存在局限性.

研究的目的:

开发和验证一种方法来测量在高压下铁相过渡期间的平面应变元件.
为了研究与α-Fe到epsilon-Fe相转换相关的菌株局部化.

主要方法:

利用数字图像相关性 (DIC) 在钻石细胞 (DAC) 中铁样品的光学图像上.
收集了高达17GPa的压力数据.
分析了菌株场,以确定阶段过渡开始和共存压力.

主要成果:

成功识别了α-Fe到epsilon-Fe过渡开始和相位共存域.
在直接和反向转换期间观察到菌株局部化,与微观结构变异相关.
扣除了与文献数据在0.4%以内一致的特定体积.

结论:

钻石细胞 (DICDAC) 设置中的数字图像相关性是研究相位转换菌株的合适工具.
这种技术为在极端压力条件下材料的机械行为提供了宝贵的见解.
这些发现有助于更好地了解与地球物理学和材料科学相关的铁的行为.

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