The Research of an Internal Friction of the Pure Iron Containing Phosphorus at High Temperature

Five kinds of specimens of the Pure iron containing phosphorus were used in this work. After having removed carbon and nitrogen, we measured internal friction of these specimens at a temperature range from 300℃ to 800℃ with the inverted torsion Pendulum at low freguency·Consqu ently five specimens containing phosphorus contents at a range from 0.007 wt% to 0.28wt% show two internal friction peaks at about 580℃ and about 470℃ respectively. The activation energy of this peak at about 580℃ is 2.13ev, the another is 1·80ev. After quenching at high temPeratur e, two Peaks disappeared. Based on the results mentioned above, the Peak at about 580℃ is likely the Fe-P Peak (SS Peak) and the another is Probably the Pure iron Peak (PMPeak).
Finally, the specimen of Fe-Ce-P alloy containing a small amount of rare earth element Ce was made a experiment. Three Peaks were found at about 703℃, 601℃ and 500℃ respectively. We have a tentative idea that these three peaks are the Fe-Ce SS peak, the Fe-P SS peak and the Pure iron peak (PM peak) respectively. It is remarkable that the PM peak temperature in the Fe-Ce-P alloy is higher than that one in the Fe-P alloy. The work, which a small amount rare earth element affects the internal friction of Fe-P alloys, is being perfected.