Processes taking place in nickel powder compacts during continuous heating in a vacuum
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X-ray diffraction and calorimetric data show that the recrystallization of nickel sintered at 1200°C and deformed is no different from that of cast and deformed nickel of the same purity.
The thermal effects observed during the heating of compacts from carbonyl and reduced nickel powders are much more pronounced than those characterizing the heating of deformed nickel. Apart from this, powder compacts exhibit high-temperature regions of heat evolution which are totally absent in the case of deformed nickel.
From x-ray diffraction data, it follows that, with compacts, slower completion of recrystallization processes is observed in the temperature range 600–1100°C, i.e., after primary recrystallization, as revealed by calorimetric data.
KeywordsNickel Recrystallization Carbonyl Powder Compact Thermal Effect
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