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Effect of two steps annealing on the microstructure and dynamic strain aging behavior of Al-6Mg alloy

机译：两步退火对Al-6mg合金微观结构和动态应变老化行为的影响

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The microstructure of cold rolled Al-6Mg alloy is investigated after two steps annealing at different coupled temperatures of 250-320 °C and 320-400 °C for various times. Dynamic strain aging behavior in terms of serrated flow and strain rate sensitivity is investigated. The effect of three microstructural features, cell structure, recovered and recrystallized microstructures, on the strain rate sensitivity is elucidated. Two steps annealing process is utilized to capture the effect of recovery and precipitation phenomena on recrystallization and dynamic strain aging behaviors. The results show that the negative strain rate sensitivity of cold rolled specimen increases to positive values in recovered specimens. Effect of precipitation on the fully recrystallized micro-structure and subsequently on the strain rate sensitivity illustrates that during annealing with concurrent precipitation, dynamic strain aging is more pronounced due to increasing of dislocation waiting time in front of obstacles (precipitates). In the recrystallized microstructure without precipitates, the strain rate sensitivity is more positive, but the largest value of strain rate sensitivity is achieved in the fully recovered microstructure.
机译：在不同偶联温度下250-320℃和320-400℃的不同偶联温度下进行冷轧Al-6mg合金的微观结构。研究了在锯齿状流动和应变速率灵敏度方面的动态应变老化行为。阐明了三种微观结构特征，细胞结构，回收和再结晶微观结构对应变速率灵敏度的影响。两个步骤退火过程用于捕获回收和降水现象对重结晶和动态应变老化行为的影响。结果表明，冷轧试样的负应变速率敏感性增加到回收标本中的正值。沉淀对全重结晶微结构的影响及随后对应变率敏感性说明，由于在障碍物前面的位错等待时间增加（沉淀物），动态应变衰老在不断下降期间。在没有沉淀物的重结晶微观结构中，应变速率灵敏度更阳性，但在完全回收的微观结构中实现了应变速率灵敏度的最大值。

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