Abstract
Speci-mens of Fe, Fe-6%Al, and Alnico system (including 9%Al, 14%Ni, 24%Co, 3ooCu and balance Fe) powdered compact of 10mm∅ × l0mm size compressed by 3t/cm2 and polished lightly but not etched were studied under a high-temperature microscope, to examine continuously the change in structure under elevated temperature in vacuo from room temperature up to 1200°C. The results obtained were as follows: The change in microstructure of Fe, Fe-6%/Al and Alnico system powdered compacts under elevated temperature are illustrated in Fig. 2, Fig. 3 and Fig. 4, respectively. The specimen consisting of only Fe powder showed steady change, while in the case of specimens containing Fe-50%Al alloy powder, as progressively higher temperatures were employed, the grains of Fe-50%Al alloy were broken-down to fine particles. This break-down behaviour began at Ca. 700°C and then continued until almost 1190°C, which is the melting point of Fe-50%Al alloy. Changes in dimensions of specimens under elevated temperature corresponded with their changes in microstructures.
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