Abstract
High purity copper single crystals and fully annealed polycrystalline α-Fe were eroded by glass spheres 70 μm in diameter suspended in an argon gas stream and travelling normal to the target surface at 122 m s −1. Detailed scanning electron microscopy of eroded surfaces, together with transmission electron microscopy of erosion debris, was performed. It was observed that the surfaces developed a stable hill-and-valley topology not reported previously. The mechanism of material removal was plowing on the hillsides and flaking due to subsurface crack propagation in the valleys. Subsurface voids were created independently of second-phase particles and evidence existed for a local temperature rise at the surface.
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