The effects of pressure and specimen preparation on the microstructure of two grades of porous plasma-sprayed beryl¬lium were determined. One grade, P-l, was sintered after spraying while the other grade, P-10, was tested in the as-sprayed condition. The principal microstructural characteristics studied were grain size, grain morphology, and void distribution and size. It was found that machining can readily cause a significant dense surface layer on the porous beryllium specimens, and that the dense surface layer can be removed by etching. There was substantial difference in microstructure between the P-l sintered and P-10 unsintered specimens both before and after being subjected to Shockwaves and static compression.
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