On the Grain Growth in Molybdenum

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  • Moの結晶粒成長について
  • Mo ノ ケッショウ リュウ セイチョウ ニ ツイテ

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Recrystallization of sintered molybdenum and electron beam melted molybdenum occurred at the temperature where the maximum on the temperature derivative of the hardness was observed. The time law of grain growth can be written as<BR>(This article is not displayable. Please see full text pdf.) <BR>where the constant n for the sintered Mo is larger than that for the melted Mo. The apparent activation energy Q for grain growth is smaller in the longitudinal direction than in the transverse direction of the specimen in both materials. The grain growth rate in sintered Mo is smaller than that in the melted Mo, which is probably due to the influence of voids inherited from sintering powder in the former material. The relation between the hardness and flow stress at 8% strain is given by<BR>(This article is not displayable. Please see full text pdf.) <BR>Here the proportionality constant α for the sintered Mo is smaller than that for the melted Mo. This is presumably because that voids in the sintered Mo act as an obstacle to dislocation motion and thereby raise the work hardening rate.

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