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采用含有不同含量磷的电子轰击纯铁作样品,经脱碳脱氮后,用低频倒扭摆测量其300—800℃之间的内耗值。结果表明,磷含量在0.007—0.28wt％之间的五根样品,分别于580℃和470℃左右出现两个内耗峰,激活能分别为2.13ev和1.80ev。经高温保温一定时期淬火处理后,这两个峰全部消失。由此看出,580℃左右的峰可能是Fe—p的ss峰,而470℃的峰可能是纯铁的PM峰。 本文还研究了一根含稀土元素铈的铁磷合金的内耗。发现在703℃、601℃和500℃相应出现三个内耗峰。初步认为,它们分别是Fe—Ce的ss峰、Fe—P的ss峰和纯铁的PM峰。
Electron bombardment of pure iron with different content of phosphorus was used as the sample, after decarbonization and denitrification, the internal friction value between 300-800 ℃ was measured by low frequency inverted torsion pendulum. The results show that there are two internal friction peaks at 580 ℃ and 470 ℃ respectively for the five samples with phosphorus contents of 0.007-0.28wt%, and the activation energies are 2.13ev and 1.80ev respectively. After a certain period of high temperature insulation quenching, these two peaks all disappear. It can be seen that the peak around 580 ℃ may be the ss peak of Fe-p, while the peak at 470 ℃ may be the PM peak of pure iron. The paper also studied the internal friction of an iron-phosphorus alloy containing rare earth element cerium. Three internal friction peaks were found at 703 ° C, 601 ° C and 500 ° C. They are presumed to be the ss peak of Fe-Ce, the ss peak of Fe-P and the PM peak of pure iron, respectively.