Internal Friction of Iron-Nickel Alloys Containing Nitrogen or Carbon

• Published in: Oyo Buturi Vol. 30; no. 2; pp. 120 - 126
• Main Authors: SAKAMOTO, Koshiro, SUGENO, Takesi
• Format: Journal Article
• Language: Japanese
• Published: The Japan Society of Applied Physics 10.02.1961
• ISSN: 0369-8009; 2188-2290
• DOI: 10.11470/oubutsu1932.30.120

Internal friction in quenched iron-nickel alloys (5.031.6% Ni) containing a small amount of nitrogen or carbon was measured with a torsion pendulum and two peaks of internal friction were observed around 40°C and 160°210°C with a frequency of vibration of about 1.7 cycles per second. The 40°C peak is the same as the Snoek's peak associated with the stress-induced diffusion of nitrogen or carbon in α-iron. The more Fe-Fe interstitial sites in the iron-nickel alloys, the higher the peak of internal friction becomes. Thus it seems likely that the interstitial nitrogen atom is more stable at the Fe-Fe interstitial site than at the Ni-Ni or Fe-Ni site. It is supposed that the origin of the high temperature peak of internal friction in the quenched iron-nickel alloys is the same as that of an internal friction peak observed in cold-worked iron, for the values of activation energy associated with the peaks and the peak temperatures in both cases are nearly equal. Thus it seems probable that the main cause of the high temperature peak of internal friction in the iron-nickel alloys is an interaction between lattice defects produced by a martensitic transformation and interstitial solute atoms (nitrogen or carbon atoms).