Stability of Grain Structures in Sintered Molybdenum Alloys Dispersed with Carbide Particles at High Temperatures.

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  • 超微細結晶粒材料の作成と物性　　炭化物粒子分散Ｍｏ焼結合金の高温における結晶粒組織の安定性
  • タンカブツ リュウシ ブンサン Mo ショウケツ ゴウキン ノ コウオン ニ オケル ケッショウリュウ ソシキ ノ アンテイセイ

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Abstract

Fine-grained sintered molybdenum alloys dispersed with TiC, ZrC, HfC or TaC particles of 0.8 mol.% were prepared by mechanical alloying and hot isostatic pressing. The grain sizes of molybdenum and the particle sizes of carbide particles in the alloy were 0.2-10μm and 20-100 nm, respectively. Grain growth of the alloy was measured to evaluate the stability of the fine-grained microstructure at 1670 K to 2470 K. The following results were obtained.<BR>(1) The grain growth was inhibited significantly more in the molybdenum alloy with carbide particles than in puremolybdenum. The grain growth stopped in 3.6-36 ks.<BR>(2) The dispersion of the ZrC or HfC particles in the alloy was more efficacious against inhibition of grain growth than the dispersion of the TaC or TiC particles.<BR>(3) The grain boundary character distribution in the alloys showed almost no change even after heated at high temperature of 2070K.

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