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Abstract
Small-angle neutron scattering has been applied to investigate the microporosity of sintered molybdenum. The results indicate the presence of micropores (radius 200 to 800 Å) in the sintered samples. The size distribution of these cavities shifts toward larger values when the duration of the sinter treatment is increased from 1 to 15 h. At the same time, the total volume of the pores decreases. A molybdenum sample melted by electron bombardment does not exhibit the characteristic small-angle scattering effect found in sintered samples. The results have been corroborated by transmission electron microscopy: a carefully thinned sample of the sintered material showed cavities whose size and number agreed well with the small-angle scattering data, while a sample prepared from the molten material showed no cavities.