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在实验温度为300℃和400℃,应变速率为0.01s~(-1)和1s~(-1),每道次应变0.4,道次间隔时间为10~900 s条件下,在Gleeble~(-1)500D热力模拟实验机上进行了锻态Al-Zn-Mg-Cu高强铝合金双道次等温压缩实验,研究了合金改锻试样的流变应力软化行为和微观组织演变。结果表明,该合金的双道次热压缩应力软化程度随着温度的升高而降低,随着应变速率的升高而增大,随着道次保温时间延长而升高。400℃时,由于合金在变形过程中的完全回复和再结晶,释放了大部分变形储能,道次间应力软化不明显,且不受应变速率和保温时间的影响;300℃、1 s~(-1)条件下道次间的应力软化程度最为明显,保温10~240 s期间产生的应力软化主要是由再结晶晶粒的长大引起的,240~900 s期间的应力软化主要受析出相的影响。
Under the conditions of 300 ℃ and 400 ℃, the strain rates of 0.01s -1s and 1s -1, the strain per pass 0.4 and the interval time 10 ~ 900s, -1) 500D thermomechanical simulator was used to study the two-pass isothermal compression test of Al-Zn-Mg-Cu high-strength aluminum alloy. The flow stress softening behavior and microstructure evolution of the alloy were investigated. The results show that the degree of softening of the two-pass hot compressive stress of the alloy decreases with the increase of temperature, increases with the increase of strain rate, and increases with the passage of time. At 400 ℃, most of the deformation energy storage was released due to the complete recovery and recrystallization of the alloy during deformation. The stress softening between passes was insignificant and unaffected by the strain rate and holding time. At 300 ℃ for 1 s ~ (-1), the stress softening degree between the passes was the most obvious. The stress softening during the period of 10 ~ 240 s was mainly caused by the recrystallization grain growth, and the stress softening during 240-900 s was mainly precipitated Phase effects.