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In-situ mechanical investigation of the deformation of splat interfaces in cold-sprayed aluminum alloy

机译：冷喷涂铝合金中splat界面变形的原位力学研究

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The mechanical properties of cold sprayed deposits, with splats as their building blocks, are affected by de-bonding and relative sliding of splats during mechanical loading. In this study, inter-splat deformation behavior in 6061 Al coatings is investigated byin-situmechanical characterization for real-time visualization. The role of processing gas type (He vs. Air), splat geometry, particle bonding, and post-spray heat treatment on splat sliding is evaluated. High porosity and poor splat-bonding in air-sprayed coating result in inferior microhardness (917 MPa) and flexural strength (120 MPa), as compared to He-sprayed coating which exhibits microhardness and flexural strength of 1000 MPa and 450 MPa, respectively.In-situcyclic bending of coatings is performed inside a scanning electron microscope to examine the splat deformation behavior. Digital image correlation (DIC) analysis of the real-time videos is performed to determine local microstructure strains, experimentally demonstrating splat sliding phenomenon for the first time. Heat-treatment of the coatings heals inter-splat microcracks, reduces porosity and consequently improves the mechanical properties. DIC strain maps revealed arrested splat sliding after heat-treatment. A splat sliding factor (SSf) is introduced, which compares cold-sprayed microstructure deformation with the bulk structure like substrate, providing quantitative information about inter-splat bonding. The SSfis found to be higher for air-sprayed coating (~ 1.4) as compared to He-sprayed coating (~ 0.28), and is further reduced after heat-treatment. The correlation between splat sliding and microstructure will enable development of coatings with predictable and improved mechanical properties by cold spray.
机译：以小片为基石的冷喷涂沉积物的机械性能受机械加载过程中小片的脱粘和相对滑动的影响。在这项研究中，通过内部力学表征来研究6061 Al涂层的板间变形行为，以实现实时可视化。评估了处理气体类型（氦气与空气），喷头几何形状，颗粒结合以及喷头滑动后喷涂后热处理的作用。与He喷涂涂层的显微硬度和弯曲强度分别为1000 MPa和450 MPa的情况相比，气喷涂膜中的高孔隙率和较差的喷溅结合导致较低的显微硬度（917 MPa）和抗弯强度（120 MPa）。在扫描电子显微镜内部进行涂层的原位循环弯曲，以检查飞溅变形行为。进行实时视频的数字图像相关性（DIC）分析，以确定局部微结构应变，首次通过实验证明了飞溅滑动现象。涂层的热处理可修复板间微裂纹，减少孔隙率，从而改善机械性能。 DIC应变图显示热处理后停止的splat滑动。引入了Splat滑动因子（SSf），将冷喷涂的微观结构变形与整体结构（如基材）进行了比较，从而提供了关于Splat粘结的定量信息。发现空气喷涂涂层的SSfis（〜1.4）比He喷涂涂层的SSfis（〜0.28）高，并且在热处理后会进一步降低。 splat滑动与微观结构之间的相关性将使通过冷喷涂开发具有可预测和改善的机械性能的涂层成为可能。

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