Abstract
A study has been performed to determine the correlation between the microstructure, metallurgical processing, and surface finish of eight specially selected molybdenum (Mo) specimens from various sources. Samples of bar and plate stock produced from pure Mo either arc-cast or pressed and sintered, and TZM (Ti-Zr-Mo) Mo alloy were examined in the form of optically polished 1 ½-inch- (3.86-cm-) diameter discs. Metallurgical characterization included hardness measurements, grain size and shape determinations from polished and etched sections, scanning electron microscopy, and Auger electron spectroscopy. Optical characterization consisted of measurements of total integrated scattering, rms roughness, height distribution functions, and autocovariance. In some cases, the surface roughness of as-polished mirror surfaces could be directly related to grain structure and substructure as revealed by etching. These observations and their implications for the selection of Mo starting stock to be used in the production of low-scatter laser mirrors will be discussed.
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