焼結タングステン細線の高温クリープに及ぼす2次再結晶粒形態の影響

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タイトル別名
  • Morphological Effect of Secondary Recrystallized Grains on High-Temperature Creep of P/M Tungsten Fine Wires
  • ショウケツ タングステンサイセン ノ コウオン クリープ ニ オヨボス 2ジ サイケッショウ リュウケイタイ ノ エイキョウ

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抄録

It is investigated how the morphological change of secondary recrystallized grains grown in powder metallurgy tungsten fine wires has an effect on creep at high temperatures after it is quantitatively estimated. The quantitative treatment of the grain morphology is possible by using f1 as the representative one of the grain shape parameters. The optimum interlocked grain structure is defined as the grain morphology in which the grain aspect ratio is minimized under the condition that the area of grain boundaries does not increase drastically. The high-temperature creep can then be characterized by the index ΔI(=f1−f10) which indicates the degree of deviation from the optimum interlocking of grains which is designated by f10. The region of power law creep in the deformation mechanism maps is minimized at ΔI=0 at which the grains are most favourably interlocked, being extended as ΔI deviates from ΔI=0. It is considered that the deformation in the region is strongly influenced by grain boundary sliding, being further done by grain boundary cavitation with an increase in ΔI at ΔI>0.

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  • 日本金属学会誌

    日本金属学会誌 63 (5), 585-588, 1999

    公益社団法人 日本金属学会

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