Internal Friction of Ultrafine-Grained Nickel Produced by Accumulative Roll-Bonding(ARB)

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  • Koizumi Yuichiro
    Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University
  • Ueyama Masanori
    Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University
  • Tsuji Nobuhiro
    Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University
  • Minamino Yoritoshi
    Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University
  • Ota Ken'ichi
    Department of Chemistry and Materials Technology, Kyoto Institute of Technology

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Other Title
  • 繰り返し重ね接合圧延（ＡＲＢ）により結晶粒超微細化されたニッケルの内部摩擦
  • クリカエシ カサネ セツゴウ アツエン ARB ニ ヨリ ケッショウリュウ チョウビサイカ サレタ ニッケル ノ ナイブ マサツ

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Abstract

  Internal friction (Q-1) of nickel sheets highly deformed up to an equivalent strain (ε) of 4.8 by the Accumulative Roll-Bonding (ARB) process was investigated in order to clarify the damping mechanism of the ultrafine-grained materials produced by severe plastic deformation. Although the strength increased with increasing number of the ARB cycle (N), the maximum value of Q-1 was obtained at N=4 (ε=3.2). At relatively small ε about 1, where dislocation cell structure was formed, relatively small Q-1 below 5×10-3 was obtained. The dislocations within the cell walls appeared to be tightly pinned at high density of nodes or other dislocations. In the middle range of ε, where the ultrafine grains having diameter lager than 0.2 μm were formed, a high valued of Q-1 greater than 5×10-3 was obtained. In the ultrafine grains, dislocations without the pinning by nodes or other dislocations were observed. At the largest ε of 4.8, where the grain size was as small as 0.15 μm, the Q-1 was smaller than 4×10-3. The distance of the dislocation motion under vibration stress seemed to be small due to the fine grain size. The change in the Q-1 with number of the ARB cycles was attributed to the changes in the dislocation density and the distance of dislocation motion under vibrating stress which is controlled by the pinning points and the grain boundaries.<br>

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