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High temperature plasticity of polycrystalline Galfenol (Fe-Ga)

机译：多晶加仑酚（Fe-Ga）的高温可塑性

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Galfenol (Fe-Ga) is a promising and mechanically robust magnetostrictive actuator material. However, due to its high conductivity, it needs to be in thin sheet form to avoid excessive eddy current losses. Work is underway to develop conventional rolling processes to produce large quantities of thin Galfenol sheet, while retaining a preferred < 100 > crystallographic texture to optimize magnetostrictive performance. Knowledge of high temperature polycrystalline plasticity is crucial to understanding formability and crystallographic texture evolution during rolling. The deformation behavior of polycrystalline Galfenol at high temperatures was studied. Preliminary results suggest that significant dynamic recovery and/or recrystallization occur during deformation, resulting in a random texture. In-situ neutron diffraction experiments are being developed to obtain qualitative and quantitative information on the high temperature plane strain deformation of Galfenol. These experiments will be used to identify the slip systems that contribute to plastic deformation, and their dependence on temperature. Simultaneously, models of large-scale polycrystal plasticity are being developed to predict internal strains and texture evolution during deformation, which will be validated against the data obtained from the neutron diffraction experiments. Ultimately, the models will be used to develop thermo-mechanical treatments to optimize texture evolution during rolling.
机译：加利福酚（Fe-Ga）是一种有希望和机械稳健的磁致伸缩致动器材料。然而，由于其高导电性，需要处于薄板形式以避免过度涡流损耗。正在进行工作以开发常规的轧制工艺以产生大量的薄丙烯酚片，同时保留优选的<100>晶体纹理以优化磁致伸缩性能。高温多晶塑性的知识对于在轧制过程中理解成型性和晶体纹理演化至关重要。研究了高温下多晶加仑酚的变形行为。初步结果表明，在变形过程中发生显着的动态恢复和/或重结晶，导致随机纹理。正在开发出原位中子衍射实验，以获得关于加仑酚的高温平面应变变形的定性和定量信息。这些实验将用于识别有助于塑性变形的滑动系统，以及它们对温度的依赖性。同时，正在开发大规模多晶塑性的模型来预测变形过程中的内部菌株和纹理演化，这将验证从中子衍射实验获得的数据。最终，该模型将用于开发热机械处理，以优化轧制过程中的纹理演变。

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