Abstract
1. The recrystallization threshold of metal powder compacts is lower, and their temperature range of primary recrystallization wider, compared with cold-worked cast specimens. The regularities observed are attributable to the fact that the total amount of stored energy is greater in metal powders than in cast specimens and that the distribution of strain in a compact is very uneven. 2. A correlation is shown to exist between the recrystallization threshold of nickel powder compacts and the intensity with which they undergo densification during sintering. The role of primary recrystallization in sintering processes is examined. 3. A Permalloy alloy produced by sintering a powder mixture having the lowest recrystallization threshold exhibits the best magnetic properties. Thus, the maximum magnetic permability of specimens prepared from carbonyl iron and nickel powders is three to five times higher than that of an alloy produced from reduced powders.
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