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Al-0.03at％Mg合金在倒扭摆上-65℃在原位进行拉伸,形变量为0.5％,然后在升温过程中测量内耗,于-30℃及60℃附近观测到内耗峰,随后从80℃的降温过程中仍在相同温度观测到内耗峰。研究了不同温度下的内耗-振幅曲线,在降温过程中出现内耗峰的温度范围内观测到了振幅内耗峰,并由此计算得到等效激活能分别为0.32及0.22eV。初步认为,当低温冷加产生的位错弯结在外力作用下作沿边往复运动时,“镁原子-空位”对和镁原子被拖曳运动是分别引起-30℃峰和60℃峰的可能的原因。
The Al-0.03at% Mg alloy was stretched in-situ at -65 ℃ on the inverted torsion with a deformation of 0.5%. Then the internal friction was measured during the heating process. The internal friction peak was observed at -30 ℃ and 60 ℃, 80 ℃ cooling process is still observed at the same temperature internal friction peak. The internal friction - amplitude curve at different temperatures was studied. The internal friction peak was observed in the temperature range where the internal friction peak appeared during the cooling process, and the equivalent activation energies were 0.32 and 0.22 eV, respectively. It is preliminarily believed that the “magnesium atom-vacancy” pair and the magnesium atom being towed are the possible causes of -30 ℃ peak and 60 ℃ peak, respectively. the reason.