純ニッケルの静的再結晶における組織形成過程

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  • Formation Mechanism of Microstructure during Static Recrystallization of Pure Nickel
  • ジュンニッケル ノ セイテキ サイケッショウ ニ オケル ソシキ ケイセイ カテイ

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The difference of formation mechanisms of microstructure between dynamic and static recrystallization in pure nickel was studied on the basis of texture and EBSP analysis. Uniaxial compression was conducted at room temperature, followed by annealing at 905 K from 10 s to 28.8 ks. The process of static restoration was traced by optical microscopy and the measurement of micro Vickers hardness.<BR>Fraction of statically recrystallized region was 30% and 80% at annealing for 10 s and 60 s, respectively. Annealing longer than 60 s results in a 100% recrystallized state. The value of maximum pole density of texture was 4.6 after the uniaxial compression up to the true strain of −0.66. During static recrystallization, the texture became weak and finally the maximum pole density fell off in 2.0. The position of maximum pole density, however, did not change from (011). At the initial stage of static recrystallization, new grains nucleated with random orientation in the vicinity of grain boundaries; inhomogeneously deformed regions. On the other hand, at the final stage of static recrystallization, new grains formed from the regions suffered from relatively homogeneous deformation. At this stage, the main component of the texture was (011) although it was the weak texture. In dynamic recrystallization, new grains always nucleated with random orientation at the deformation giving high values of Z. The reason is given as follows. During dynamic recrystallization, the deformation simultaneously proceeded and hence regions of inhomogeneous deformation continuously formed at the vicinity of grain boundaries. New grains nucleate preferentially from these regions.

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