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报道了从测量氧扩散峰高度的变化,来追踪氧在钼中的应变时效过程及其对屈服应力的影响。含氧的钼丝无论是淬火时效或应变时效过程中内耗峰都逐渐降低以至消失。如对样品施以轻微的形变,则内耗峰又复出现。在交替进行形变和时效过程中,内耗峰可以更迭地消失和再现。系统地研究了应变时效动力学及形变对内耗峰的影响,结果指出:(1)氧在钼中的应变时效动力学遵循由Harper修改过的Cottrell-Bilby的t~(2/3)关采式;(2)内耗峰高度随形变度的变化在2.5%伸长时具有一极大值;(3)在应变时效过程中,内耗峰的降低与屈服应力的提高相对应。根据以上所得试验结果及分析,可以认为,内耗峰的降低与氧原子向位错周围分聚有关。基于这个假定,约略计算了位错密度及气团浓度。
It is reported that the change of oxygen diffusion height in molybdenum can be used to track the strain aging process of oxygen in molybdenum and its effect on yield stress. Oxygen molybdenum wire either quench aging or strain aging process of internal friction peaks are gradually reduced or even disappear. If slight deformation is applied to the sample, the internal friction peaks appear again. During alternating deformation and aging, the internal friction peak disappears and reproduces alternately. The results show that: (1) The strain aging kinetics of oxygen in molybdenum follow the t ~ (2/3) regression of Cottrell-Bilby modified by Harper ; (2) the internal friction peak height with deformation changes at 2.5% elongation has a maximum; (3) in the strain aging process, the reduction of internal friction peak and yield stress corresponding to the increase. Based on the above test results and analysis, it is considered that the decrease of the internal friction peak is related to the oxygen atom dislocation around the dislocation. Based on this assumption, the dislocation density and air mass concentration are approximately calculated.