Evaluation of γ′ Particle Spacing along a Dislocation in a Ni-Base Superalloy, Udimet 520

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  • Ni基耐熱合金Udimet 520における転位と相互作用をもつγ′粒子の間隔
  • Ni基耐熱合金Udimet520における転位と相互作用をもつγ粒子の間隔
  • Niキ タイネツ ゴウキン Udimet520 ニ オケル テンイ ト ソウゴ
  • Evaluation of γ′ Particle Spacing along a Dislocation in a Ni-Base Superalloy, Udimet 520

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Abstract

Application of existing theories of age-hardening due to ordered phase to the measured strength of Udimet 520 has revealed that the theoretical predictions of particle spacing along a dislocation are lacking in validity and should be elaborated. In this study, distribution of γ′ particles in a slip plane in Udimet 520 was determined on the basis of direct observations of partial dislocation loops formed around particles during creep deformation. Then the sequence of dislocation movement through the array of γ′ particles was examined. The mean particle spacing along a dislocation was determined and expressed as a function of the size and volume fraction of particles and the applied stress. A comparison of the values of particle spacing evaluated in this study with existing theoretical predictions was made.

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