Materials Transactions Online

Transactions of the Japan Institute of Metals, Vol. 21 No. 2 (1980) pp.83-88
© 1980 The Japan Institute of Metals

Grain Boundary Internal Friction of Ni and Ni-B Alloys

Hajime Suto* and Shinji Sato* †

In order to investigate the solid solubility of B in Ni as a function of grain size, the high temperature internal friction of pure Ni and Ni-B alloys containing 0.0035, 0.0068 and 0.010 wt%B has been measured with particular attention to the grain boundary damping peaks. The electrical resistivity was also measured to determine the solubility. The results obtained are summarized as follows:
(1) The solubility of B in single crystal Ni is given by C(at%)=0.59 exp (-H/RT), H=65.6 kJ/mol.
(2) The apparent solubility of B in polycrystalline Ni increases remarkably with decreasing grain size.
(3) On the Q-1-1/T curves of pure Ni, there are two peaks of grain boundary damping at about 470°C and about 670°C. By addition of 0.0035 wt%B, only one peak can be observed. The peak temperature of every Ni-B alloy used is about 550°C and its activation energy is about 330 kJ/mol.

(Received August 20, 1979)

*Department of Materials Science, Faculty of Engineering, Tohoku University, Sendai, 980, Japan.

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