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Mechanical characterization of pristine and hydrogen-exposed palladium nanowires by in situ TEM

机译:原位和氢暴露钯纳米线的原位TEM力学表征

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摘要

Changes in the crystal lattice of palladium nanowires (Pd NWs) upon hydrogen exposure by absorption and interstitial introduction of hydrogen atoms within the matrix can induce swelling of the nanostructure and generate dislocations through the solid that may alter the overall mechanical performance of the material. Understanding the mechanical behavior of Pd NW-based hydrogen sensors may provide crucial information regarding material changes where the integrity of the sensing device can be compromised. The plastic behavior of hydrogen sensing Pd NWs was studied prior to - and subsequently to - hydrogen exposure via in situ transmission electron microscope-atomic force microscope (TEM-AFM) experiments to understand the role of hydrogenation in the NWs mechanical performance simultaneous to real-time observation. Quantitative and qualitative analysis was performed for deformed NWs upon compression and tension. Large plastic deformation was observed for pristine Pd NWs whereas little plastic deformation was observed for hydrogen-exposed Pd NWs. Tested pristine NWs behaved in a ductile manner, and necking events were observed for all tested specimens upon tension. Lowered ductility was observed for the hydrogen-exposed specimen, in accordance with hydrogen embrittlement observed in bulk palladium.
机译:通过吸收和向基体内引入氢原子而向氢暴露后,钯纳米线(Pd NWs)的晶格变化会引起纳米结构膨胀,并通过固体产生位错,从而可能改变材料的整体机械性能。了解基于Pd NW的氢传感器的机械行为可能会提供有关材料变化的重要信息,从而可能会损害传感设备的完整性。通过原位透射电子显微镜-原子力显微镜(TEM-AFM)实验研究了氢敏感Pd净水的塑性行为,然后进行了氢暴露之前和之后的研究,以了解加氢在净水力学性能与实际NW同步作用中的作用。时间观察。压缩和拉伸后,对变形的净水进行了定量和定性分析。原始Pd NWs观察到较大的塑性变形,而氢暴露的Pd NWs观察到很小的塑性变形。测试过的原始NW表现出延展性,并且在受拉时所有测试样品均观察到颈缩现象。根据在散装钯中观察到的氢脆,观察到了氢暴露样品的延展性降低。

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