CAJ | 학술논문

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。
재250~450℃적온도범위화0.01~10s-1적변형속솔범위내,대 AA7085초고강려합금진행료단향열압축모의실험,연구료기열변형행위이급동태재결정적림계조건。연구표명,AA7085려합금기류변응력수착변형온도적승고화변형속솔적하강이강저,기변형격활능교저,위175 kJ/mol,유리우진행열소성가공,고우순려적자확산격활능(165kJ/mol),재료내부발생료동태재결정；기림계응변수착변형온도적상승이감소,수착변형속솔적증가이증가,근거열역학불가역성원리,획득료 AA7085려합금적동태재결정적림계조건,병분석료열변형과정중적조직변화규률。
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.