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在小型拉力试验机上测量了几种铝铜和铝镁合金试样在拉伸形变过程中的低频内耗,观测到在内耗-应变曲线上出现一系列的跳跃现象。研究了测量温度和一些冶金因素对于这种跳跃现象的影响。实验结果指出,出现这种现象的温度范围与铝铜合金中出现台阶状或锯齿状应力-应变曲线的温度范围相对应。这表明,这种现象与在范性形变过程中所进行的应变时效过程有关,是由于位错气团在形变过程中的更迭形成和解脱所引起。
In the small tensile testing machine, several kinds of low-frequency internal friction loss of aluminum-copper and aluminum-magnesium alloy during tensile deformation were measured. A series of jumps were observed on the internal friction-strain curve. The effects of measuring temperature and some metallurgical factors on this jump phenomenon were investigated. The experimental results indicate that the temperature range in which this phenomenon occurs corresponds to the temperature range in which stepped or jagged stress-strain curves occur in the aluminum-copper alloy. This shows that this phenomenon is related to the strain aging process in the process of normal deformation due to the formation and release of dislocation air masses during the deformation process.