Sarah Yehya, Thomas W. Cornelius, Marie-Ingrid Richard, Felisa Berenguer, Mor Levi, Eugen Rabkin, Olivier Thomas, Stéphane Labat
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引用次数: 0
摘要
纳米晶体中的缺陷会极大地改变其物理和化学行为。因此,了解纳米尺度的缺陷行为对提高材料性能至关重要。在此,我们报告了 550 nm Pt 纳米粒子塑性开始时的三维缺陷表征。通过将原位纳米压痕与布拉格相干 X 射线衍射成像(BCDI)相结合,我们直接观察了压痕过程中铂粒子内部的应变场,揭示了棱柱位错环的成核和传播过程。随后对完整的位错网络进行死后成像,再加上多反射 BCDI,使我们能够确定缺陷的布尔矢量,从而揭示出无柄位错。最后,通过测量压痕过程中晶体内部的弹性场,我们估计产生缺陷所需的剪应力为 6.4 GPa,这代表了弹性的理论上限,并为铂纳米粒子设定了前所未有的标准。我们的发现为纳米级系统中的缺陷动力学提供了基本见解,为先进材料设计和工程提供了宝贵的知识。
In situ three-dimensional observation of plasticity onset in a Pt nanoparticle
Defects in nanocrystals can dramatically alter their physical and chemical behavior. It is thus crucial to understand the defect behavior at the nanoscale to enhance material properties. Here, we report three-dimensional defect characterization at the onset of plasticity in a 550 nm Pt nanoparticle. By combining in situ nano-indentation with Bragg Coherent X-ray Diffraction Imaging (BCDI), we directly observe the strain field inside the Pt particle during indentation, revealing the nucleation and propagation of prismatic dislocation loops. Subsequent post mortem imaging of the complete dislocation network, coupled with multi-reflection BCDI, enabled us to determine the Burgers vectors of the defects revealing sessile dislocations. Finally, by measuring the elastic field inside the crystal during indentation, we estimate that the shear stress required to generate defects is 6.4 GPa, representing the upper theoretical limit of elasticity and setting an unprecedented standard for Pt nanoparticles. Our findings provide fundamental insights into defect dynamics in nanoscale systems, offering invaluable knowledge for advanced materials design and engineering.
期刊介绍:
Nanoscale is a high-impact international journal, publishing high-quality research across nanoscience and nanotechnology. Nanoscale publishes a full mix of research articles on experimental and theoretical work, including reviews, communications, and full papers.Highly interdisciplinary, this journal appeals to scientists, researchers and professionals interested in nanoscience and nanotechnology, quantum materials and quantum technology, including the areas of physics, chemistry, biology, medicine, materials, energy/environment, information technology, detection science, healthcare and drug discovery, and electronics.