Damage mechanism induced by 25 μm, average size, angular and spherical particles impacting the surface of Cu-30% Zn (α-brass) was investigated. Particles were impacted to the surface at normal incidence, with a velocity of 12 m/s. The primary characterization tools used were scanning electron microscopy (SEM) and atomic force microscopy (AFM). AFM allowed for the measurement of impact profiles, those of the cut surface and material pile-ups. Deformed volume by the particles was limited to a single grain. The impacts produced were asymmetrical and the chip formation was also highly directional. These asymmetries were the same in a single grain but they varied from grain to grain. Regardless of particle geometry, similar deformation features were observed on the target surface impacted by angular and spherical particles. The direction of the deformation appeared to be imposed by the mechanical response of the deforming grain. Since the deformation induced by a single impact is limited to a single grain, anisotropic mechanical properties of the individual grains observed were attributed to their impact damage morphology.
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机译：研究了由25μm，平均尺寸，角形和球形颗粒撞击Cu-30％Zn（α-黄铜）表面引起的损伤机理。垂直入射时，粒子以12 m / s的速度撞击到表面。使用的主要表征工具是扫描电子显微镜（SEM）和原子力显微镜（AFM）。原子力显微镜可用于测量冲击剖面，切割面和材料堆积情况。颗粒的变形体积限于单个晶粒。产生的冲击是不对称的，切屑的形成也是高度定向的。这些不对称性在单个晶粒中相同，但它们随晶粒的不同而不同。无论粒子的几何形状如何，在受角和球形粒子撞击的目标表面上都观察到类似的变形特征。变形的方向似乎是由变形晶粒的机械响应强加的。由于单次冲击引起的变形仅限于单个晶粒，因此观察到的单个晶粒的各向异性力学性能归因于其冲击破坏形态。
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