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固溶在面心铁—镍合金中的碳原子,能引起一个应力感生的扩散内耗峰。当振动频率约为1.4周/秒时,峰的位置在500°K附近。固溶的碳原子可以跳入点阵空位中而成为代位式碳原子,此碳原子舆另一个最近邻的间隙碳原子相结合后即形成一组碳原子对。在外加应力的作用下,这类碳原子对轴的择尤旋转便引起了内耗。根据这个机构并结合内耗测量过程中试样内部碳原子重新分布的情况,可以推导出碳浓度和内耗峰高度之间的定量关系,并从而求出合金的点阵空位形成能和构成碳原子对时所放出的能量。 铁—镍合金中碳扩散峰的特徵是:峰的二边内耗曲线不对称,在高温的一边,内耗反而比低温的一边为低。峰的位置T′随淬火温度或碳浓度之增加而渐向低温移动;峰愈出现在低的温度,T′Q_(max)~(-1)相乘积就愈大。根据本文所提出的理论,对这些特徵作了解释。
Solid solution in the face-iron-nickel alloy carbon atoms, can cause a stress-induced proliferation of internal friction peak. When the vibration frequency is about 1.4 weeks / second, the location of the peak is around 500 ° K. Solid solution of carbon atoms can jump into the lattice vacancy and become a substitute carbon atom, the carbon atoms of another nearest neighbor of the gap carbon atoms combine to form a group of carbon atoms on the pair. In addition to the role of stress, such carbon atoms on the axis of the particular rotation caused by internal friction. According to this mechanism and in conjunction with the redistribution of carbon atoms in the sample during the internal friction measurement, the quantitative relationship between the carbon concentration and the internal friction peak height can be deduced and the lattice vacancy formation energy and the carbon atom pair When the energy released. The characteristic of carbon diffusion peak in iron-nickel alloy is that the internal friction curve of the two sides of the peak is asymmetric. On the high temperature side, the internal friction is lower than the low temperature side. Peak position T ’with the increase of quenching temperature or carbon concentration and gradually move to low temperature; the peak appears at a lower temperature, T’Q_ (max) ~ (-1) product of the greater. According to the theory proposed in this paper, these characteristics are explained.