摘要
在用多功能内耗仪对Fe-25Cr-5Al(重量百分数)合金中的Snoek弛豫内耗峰进行的研究实验发现:1200℃淬火的Fe-25Cr-5Al样品的内耗-温度的加热曲线上,在280℃左右出现了一个弛豫型的内耗峰,这个峰在随后的冷却过程中不出现,随振动频率的增加峰位移向高温,根据Arrhenius关系计算得到这个峰的激活能是1．20ev。分析认为这个内耗峰是Fe-25Cr-5Al合金中存在的间隙杂质原子C、N引起的。在淬火的状态下,C、N原子固溶于Fe晶格间隙中,在加热过程中,在循环应力诱导下,C(或N)组成的偶板子产生重新取向,从而产生弛豫,而在冷却过程中, C、N原子形成化合物在晶界析出,因此,不产生内耗峰。
Snoek relaxation has been investigated in the Fe-（wt.% ）25Cr-5Al alloy using a multifunctional internal friction apparatus in this paper. A relaxation internal friction peak is found at about 280℃ for the quenched samples during heating and disappears during subsequent in-situ cooling. The peak position shifts to higher temperature with increasing vibration frequency. In terms of Arrhenius relaxation, the activation energy of the peak can be calculated to be 1.20ev. The peak originates from interstitial impurities C.N atoms. Under the state of quenching, C.N atoms are solved and located in the octahedral sites in . The poles that consist of C,N atoms are re-orientated under cycle stress-inducing, resulting in the relaxation peak. No internal friction peak appears during subsequent in-situ cooling since C.N atoms are combined into compounds, which precipitate at crystalline boundaries.
出处
《苏州市职业大学学报》
2007年第1期65-67,70,共4页
Journal of Suzhou Vocational University
基金
江苏省教育厅基金(04 KJD 140172和05KJD430199)
江苏省"六大人才高峰行动计划"资助项目(06-E-011)。
