Abstract
Machining damage can seriously degrade the mechanical properties of beryllium. In this study substantial machining damage was introduced in two different structural grades of beryllium. Two methods of relieving the machining damage were studied: annealing at various temperatures and etching away various amounts of surface material. For the depth of damage introduced in the study (approximately 100 Σm (0.004 in.)), removing the machining damage in the first 25 to 50 Σm (0.001 to 0.002 in.) by either etching or annealing restored the mechanical properties of the beryllium. Microhardness was useful for ascertaining the extent of machining damage.
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