The present research focuses on analyzing the deformation mechanisms associated with tensile loading of the FeMnCoCr high entropy alloy (HEA) using synchrotron x-ray diffraction (SXRD). This novel material is comprised by two major phases: γ-FCC and ε-HCP, where transformation induced plasticity (TRIP) effectively transforms the first into the latter, upon the application of an external stress. However, the presence of thermally stable ε-HCP prior to loading will also influence the deformation mechanism of the material during mechanical solicitation. As such, here we investigate the activation of different strain accommodation mechanisms and the consequent microstructural evolution. Four stages were identified in the mechanical response of this novel HEA, where the TRIP and the twinning induced plasticity (TWIP) deformation modes are the main events granting this HEA its outstanding properties. Such sequence of events allows to evidence the effectiveness of the collaboration between the transformative capability of the γ-FCC phase and the work hardening potential of the ε-HCP phase. This analysis is performed via quantitative and qualitative analysis of the SXRD data, allowing also to investigate the response behavior of specific crystallographic planes to the increasing stress throughout the experiment.

中文翻译：

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使用同步加速器 X 射线衍射探测拉伸加载期间 TRIP/TWIP Fe50Mn30Co10Cr10 高熵变形机制的时间分辨演化


目前的研究重点是使用同步加速器 X 射线衍射 (SXRD) 分析与 FeMnCoCr 高熵合金 (HEA) 拉伸载荷相关的变形机制。这种新型材料由两个主要相组成：γ-FCC 和 ε-HCP，其中相变诱导塑性 (TRIP) 在施加外部应力时有效地将第一个相转变为后者。然而，加载前热稳定 ε-HCP 的存在也会影响机械诱导过程中材料的变形机制。因此，我们在这里研究不同应变调节机制的激活以及随之而来的微观结构演化。这种新型 HEA 的机械响应分为四个阶段，其中 TRIP 和孪生诱导塑性 (TWIP) 变形模式是赋予这种 HEA 出色性能的主要事件。这样的事件序列可以证明 γ-FCC 相的转化能力和 ε-HCP 相的加工硬化潜力之间协作的有效性。该分析是通过对 SXRD 数据进行定量和定性分析来进行的，还可以研究特定晶面对整个实验过程中不断增加的应力的响应行为。