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An investigation into microstructure and mechanical properties of cold sprayed 7075 Al deposition

机译：7075 Al冷喷镀层组织与力学性能的研究。

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摘要

Cold spray deposition is well known to produce a highly deformed microstructure with large strain gradients across the individual particles composing the deposited layer. This study investigates the relationship between the as-deposited cold spray microstructure and the resulting local and coating-scale mechanical properties of 7075 aluminum powder deposited onto wrought 7075 aluminum substrates via high pressure cold spray. Local mechanical property variations were probed using nanoindentation and correlated with microstructural characterization conducted via various microscopy techniques. 7075 Aluminum powder particles experienced high deformation rates during impact, resulting in local microstructural variations, specifically grain size and dislocation densities, between particle interfaces and their interiors. Consequently, an average 0.5 GPa increase in nanohardness was observed in particle interface regions. This increase in hardness was concluded to be primarily the result of grain refinement promoted by local dynamic recrystallization, rather than from an increase in local dislocation density causing strain hardening behavior. Examination of the coating revealed a decrease in hardness and an increase in local grain size with increasing distance from the substrate. The effects of these microstructural variations on the quality of the deposition were also evaluated by tensile pull-off and three lug shear testing.
机译：众所周知，冷喷涂沉积会产生高度变形的微观结构，并在组成沉积层的单个颗粒上产生较大的应变梯度。这项研究调查了沉积的冷喷涂微观结构与通过高压冷喷涂沉积到变形的7075铝基板上的7075铝粉的局部和涂层尺度机械性能之间的关系。使用纳米压痕探测局部机械性能变化，并将其与通过各种显微镜技术进行的微结构表征相关联。 7075铝粉颗粒在冲击过程中经历了很高的形变速率，从而导致了颗粒界面与内部之间的局部微观结构变化，特别是晶粒尺寸和位错密度。因此，在颗粒界面区域观察到纳米硬度平均增加0.5 GPa。可以认为，硬度的增加主要是由于局部动态再结晶促进了晶粒细化的结果，而不是局部位错密度的增加导致了应变硬化行为。对涂层的检查表明，随着距基材的距离增加，硬度降低，局部晶粒尺寸增加。这些微结构变化对沉积质量的影响也通过拉伸拉拔和三凸耳剪切试验进行了评估。

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  • 来源
    《Materials Science and Engineering》 |2015年第11期|19-27|共9页
  • 作者

    M.R. Rokni; C.A. Widener; G.A. Crawford; M.K. West;

  • 作者单位

    Department of Materials & Metallurgical Engineering, Advanced Materials Processing Center, South Dakota School of Mines & Technology (SDSM&T), SD, USA;

    Department of Materials & Metallurgical Engineering, Advanced Materials Processing Center, South Dakota School of Mines & Technology (SDSM&T), SD, USA;

    Department of Materials & Metallurgical Engineering, Advanced Materials Processing Center, South Dakota School of Mines & Technology (SDSM&T), SD, USA;

    Department of Materials & Metallurgical Engineering, Advanced Materials Processing Center, South Dakota School of Mines & Technology (SDSM&T), SD, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Aluminum; Cold spraying; Microstructure; Nanoindentation; Electron microscopy;

    机译：铝;冷喷涂;微观结构纳米压痕电子显微镜;

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