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Rapid solidification is expected to produce fine grained superalloys displaying enhanced mechanical properties. The current paper describes the production of melt-spun ribbon.5 of two nickel base superalloys (Rene' 80 and IN738LC) and a cobalt-base superalloy (FSX414). Their microstructures have been characterized by metallographic techniques, electrical resistivity changes and hardness measurements. Tensile p'roperties were determined at ambient and elevated temperatures, where values of the strain rate sensitivity indicate that micrograin superplasticity may be occurring.

SUMMARYWe have investigated carbonyl iron powder (CIP) for the development of a low-loss power inductor at about 1 MHz. Significant differences were observed for the coercivity between two kinds of CIP, nonreduction CIP and reduction CIP. In order to investigate the origin of the significant differences of coercivity, we studied two kinds of CIP. It was shown that nonreduction CIP with low coercivity is an Fe-based nanocrystalline soft magnetic material with a high saturation magnetization. We were able to produce a low-loss dust core using a low-coercivity CIP at about 1 MHz.

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