AI 中文总结
本研究开发了一种用于SEM微力学测试的三电极背面充氢系统，通过Fe-25Cr单晶试验证实其可用于原位氢脆研究，揭示了氢对材料力学行为及变形机制的影响。
AI 中文摘要
全面理解微尺度下氢-变形相互作用对于揭示氢脆机制至关重要，因此带有同步充氢（H-充氢）的原位微力学技术近年来受到关注。本研究旨在解决当前原位H-充氢装置的缺陷，开发一种更可靠的基于三电极的背面充氢系统，用于扫描电子显微镜（SEM）开展各类微力学测试。本文讨论了该新型装置的开发，并通过Fe-25Cr单晶（110）在H-充氢期间的微柱压缩试验进行了验证。H提高了屈服强度和表观应变硬化速率，激活了多个滑移系，增加了位错密度与缠结，导致明显的林硬化，这通过电子显微镜得到证实。通过应变率跳变试验估算激活体积表明，变形受溶质拖曳效应（作用于扭折迁移率）和位错林硬化的控制。
英文摘要
A comprehensive understanding of hydrogen-deformation interactions at the microscale is essential for revealing hydrogen embrittlement mechanisms. In situ micromechanics with simultaneous hydrogen (H-) charging has therefore gained traction in recent times. In the present study, we aim to address the drawbacks of current in situ H-charging setups by developing a more robust 3-electrode-based back-side charging system for a scanning electron microscope to perform various micromechanical tests. The development of the novel setup is discussed and demonstrated through micropillar compression of an Fe-25Cr single crystal (110) during H-charging. H has increased the yield strength and the apparent strain-hardening rate. H activates multiple slip systems and enhances dislocation density and entanglement, leading to pronounced forest hardening as revealed by electron microscopy. Estimation of activation volume from strain-rate jump tests indicates that the deformation is controlled by the solute drag effect on kink mobility and dislocation forest hardening.
CommentsManuscript under revision
