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Grain Size Measurement of Aluminium Wire Using Light Microscopy and Crystal Orientation Mapping in the SEM

INTRODUCTION The Oxford Instruments Opal system was used to acquire and process crystal orientation maps to determine the grain size. The results were compared with conventional optical micrographs, and a number of "invisible"" boundaries were identified. The grain size measurements from the optical images were thus found to be significantly lower than the actual values measured using the Opal system.