在250~450℃的温度范围和0.01~10s-1的变形速率范围内,对 AA7085超高强铝合金进行了单向热压缩模拟实验,研究了其热变形行为以及动态再结晶的临界条件。研究表明,AA7085铝合金其流变应力随着变形温度的升高和变形速率的下降而降低,其变形激活能较低,为175 kJ/mol,有利于进行热塑性加工,高于纯铝的自扩散激活能(165kJ/mol),材料内部发生了动态再结晶；其临界应变随着变形温度的上升而减小,随着变形速率的增加而增加,根据热力学不可逆性原理,获得了 AA7085铝合金的动态再结晶的临界条件,并分析了热变形过程中的组织变化规律。
The hot deformation compression tests of AA7085 aluminum alloy were preformed on Gleeble-1500 system in the temperature range from 250-450℃ and at strain rate range from 0.01-10s-1 .The activity energy of AA7085 was 175kJ/mol,and it was advantageous in carries on the thermosplastic processing.The material inte-rior has had the dynamic recrystallization.The results show that the critical strain increases with increasing strain rate and decreasing the deformation temperature.The critical strain of AA7085 was proportional to Z pa-rameter.The critical condition of DRX was obtained,meanwhile,the microstructure evolution of the AA7085 was studied.
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